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Posted to notifications@commons.apache.org by gg...@apache.org on 2024/07/04 12:10:53 UTC

svn commit: r1086913 [18/46] - in /websites/production/commons/content/proper/commons-logging: ./ apidocs/ apidocs/legal/ apidocs/org/apache/commons/logging/ apidocs/org/apache/commons/logging/class-use/ apidocs/org/apache/commons/logging/impl/ apidocs...

Modified: websites/production/commons/content/proper/commons-logging/apidocs/src-html/org/apache/commons/logging/LogFactory.html
==============================================================================
--- websites/production/commons/content/proper/commons-logging/apidocs/src-html/org/apache/commons/logging/LogFactory.html (original)
+++ websites/production/commons/content/proper/commons-logging/apidocs/src-html/org/apache/commons/logging/LogFactory.html Thu Jul  4 12:10:51 2024
@@ -1,7 +1,7 @@
 <!DOCTYPE HTML>
 <html lang="en">
 <head>
-<!-- Generated by javadoc (21) -->
+<!-- Generated by javadoc (17) -->
 <title>Source code</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <meta name="description" content="source: package: org.apache.commons.logging, class: LogFactory">
@@ -56,1580 +56,1601 @@
 <span class="source-line-no">043</span><span id="line-43"> * &lt;strong&gt;IMPLEMENTATION NOTE&lt;/strong&gt; - This implementation is heavily</span>
 <span class="source-line-no">044</span><span id="line-44"> * based on the SAXParserFactory and DocumentBuilderFactory implementations</span>
 <span class="source-line-no">045</span><span id="line-45"> * (corresponding to the JAXP pluggability APIs) found in Apache Xerces.</span>
-<span class="source-line-no">046</span><span id="line-46"> */</span>
-<span class="source-line-no">047</span><span id="line-47">public abstract class LogFactory {</span>
-<span class="source-line-no">048</span><span id="line-48">    // Implementation note re AccessController usage</span>
-<span class="source-line-no">049</span><span id="line-49">    //</span>
-<span class="source-line-no">050</span><span id="line-50">    // It is important to keep code invoked via an AccessController to small</span>
-<span class="source-line-no">051</span><span id="line-51">    // auditable blocks. Such code must carefully evaluate all user input</span>
-<span class="source-line-no">052</span><span id="line-52">    // (parameters, system properties, configuration file contents, etc). As an</span>
-<span class="source-line-no">053</span><span id="line-53">    // example, a Log implementation should not write to its log file</span>
-<span class="source-line-no">054</span><span id="line-54">    // with an AccessController anywhere in the call stack, otherwise an</span>
-<span class="source-line-no">055</span><span id="line-55">    // insecure application could configure the log implementation to write</span>
-<span class="source-line-no">056</span><span id="line-56">    // to a protected file using the privileges granted to JCL rather than</span>
-<span class="source-line-no">057</span><span id="line-57">    // to the calling application.</span>
-<span class="source-line-no">058</span><span id="line-58">    //</span>
-<span class="source-line-no">059</span><span id="line-59">    // Under no circumstance should a non-private method return data that is</span>
-<span class="source-line-no">060</span><span id="line-60">    // retrieved via an AccessController. That would allow an insecure application</span>
-<span class="source-line-no">061</span><span id="line-61">    // to invoke that method and obtain data that it is not permitted to have.</span>
-<span class="source-line-no">062</span><span id="line-62">    //</span>
-<span class="source-line-no">063</span><span id="line-63">    // Invoking user-supplied code with an AccessController set is not a major</span>
-<span class="source-line-no">064</span><span id="line-64">    // issue (for example, invoking the constructor of the class specified by</span>
-<span class="source-line-no">065</span><span id="line-65">    // HASHTABLE_IMPLEMENTATION_PROPERTY). That class will be in a different</span>
-<span class="source-line-no">066</span><span id="line-66">    // trust domain, and therefore must have permissions to do whatever it</span>
-<span class="source-line-no">067</span><span id="line-67">    // is trying to do regardless of the permissions granted to JCL. There is</span>
-<span class="source-line-no">068</span><span id="line-68">    // a slight issue in that untrusted code may point that environment variable</span>
-<span class="source-line-no">069</span><span id="line-69">    // to another trusted library, in which case the code runs if both that</span>
-<span class="source-line-no">070</span><span id="line-70">    // library and JCL have the necessary permissions even when the untrusted</span>
-<span class="source-line-no">071</span><span id="line-71">    // caller does not. That's a pretty hard route to exploit though.</span>
-<span class="source-line-no">072</span><span id="line-72"></span>
-<span class="source-line-no">073</span><span id="line-73">    /**</span>
-<span class="source-line-no">074</span><span id="line-74">     * The name ({@code priority}) of the key in the configuration file used to</span>
-<span class="source-line-no">075</span><span id="line-75">     * specify the priority of that particular configuration file. The associated value</span>
-<span class="source-line-no">076</span><span id="line-76">     * is a floating-point number; higher values take priority over lower values.</span>
-<span class="source-line-no">077</span><span id="line-77">     */</span>
-<span class="source-line-no">078</span><span id="line-78">    public static final String PRIORITY_KEY = "priority";</span>
-<span class="source-line-no">079</span><span id="line-79"></span>
-<span class="source-line-no">080</span><span id="line-80">    /**</span>
-<span class="source-line-no">081</span><span id="line-81">     * The name ({@code use_tccl}) of the key in the configuration file used</span>
-<span class="source-line-no">082</span><span id="line-82">     * to specify whether logging classes should be loaded via the thread</span>
-<span class="source-line-no">083</span><span id="line-83">     * context class loader (TCCL), or not. By default, the TCCL is used.</span>
-<span class="source-line-no">084</span><span id="line-84">     */</span>
-<span class="source-line-no">085</span><span id="line-85">    public static final String TCCL_KEY = "use_tccl";</span>
-<span class="source-line-no">086</span><span id="line-86"></span>
-<span class="source-line-no">087</span><span id="line-87">    /**</span>
-<span class="source-line-no">088</span><span id="line-88">     * The name ({@code org.apache.commons.logging.LogFactory}) of the property</span>
-<span class="source-line-no">089</span><span id="line-89">     * used to identify the LogFactory implementation</span>
-<span class="source-line-no">090</span><span id="line-90">     * class name. This can be used as a system property, or as an entry in a</span>
-<span class="source-line-no">091</span><span id="line-91">     * configuration properties file.</span>
-<span class="source-line-no">092</span><span id="line-92">     */</span>
-<span class="source-line-no">093</span><span id="line-93">    public static final String FACTORY_PROPERTY = "org.apache.commons.logging.LogFactory";</span>
-<span class="source-line-no">094</span><span id="line-94"></span>
-<span class="source-line-no">095</span><span id="line-95">    private static final String FACTORY_LOG4J_API = "org.apache.commons.logging.impl.Log4jApiLogFactory";</span>
-<span class="source-line-no">096</span><span id="line-96">    private static final String LOG4J_API_LOGGER = "org.apache.logging.log4j.Logger";</span>
-<span class="source-line-no">097</span><span id="line-97">    private static final String LOG4J_TO_SLF4J_BRIDGE = "org.apache.logging.slf4j.SLF4JProvider";</span>
-<span class="source-line-no">098</span><span id="line-98"></span>
-<span class="source-line-no">099</span><span id="line-99">    private static final String FACTORY_SLF4J = "org.apache.commons.logging.impl.Slf4jLogFactory";</span>
-<span class="source-line-no">100</span><span id="line-100">    private static final String SLF4J_API_LOGGER = "org.slf4j.Logger";</span>
-<span class="source-line-no">101</span><span id="line-101"></span>
-<span class="source-line-no">102</span><span id="line-102">    /**</span>
-<span class="source-line-no">103</span><span id="line-103">     * The fully qualified class name of the fallback {@code LogFactory}</span>
-<span class="source-line-no">104</span><span id="line-104">     * implementation class to use, if no other can be found.</span>
-<span class="source-line-no">105</span><span id="line-105">     */</span>
-<span class="source-line-no">106</span><span id="line-106">    public static final String FACTORY_DEFAULT = "org.apache.commons.logging.impl.LogFactoryImpl";</span>
-<span class="source-line-no">107</span><span id="line-107"></span>
-<span class="source-line-no">108</span><span id="line-108">    /**</span>
-<span class="source-line-no">109</span><span id="line-109">     * The name ({@code commons-logging.properties}) of the properties file to search for.</span>
-<span class="source-line-no">110</span><span id="line-110">     */</span>
-<span class="source-line-no">111</span><span id="line-111">    public static final String FACTORY_PROPERTIES = "commons-logging.properties";</span>
-<span class="source-line-no">112</span><span id="line-112"></span>
-<span class="source-line-no">113</span><span id="line-113">    /**</span>
-<span class="source-line-no">114</span><span id="line-114">     * JDK 1.3+ &lt;a href="https://java.sun.com/j2se/1.3/docs/guide/jar/jar.html#Service%20Provider"&gt;</span>
-<span class="source-line-no">115</span><span id="line-115">     * 'Service Provider' specification&lt;/a&gt;.</span>
-<span class="source-line-no">116</span><span id="line-116">     */</span>
-<span class="source-line-no">117</span><span id="line-117">    protected static final String SERVICE_ID =</span>
-<span class="source-line-no">118</span><span id="line-118">        "META-INF/services/org.apache.commons.logging.LogFactory";</span>
-<span class="source-line-no">119</span><span id="line-119"></span>
-<span class="source-line-no">120</span><span id="line-120">    /**</span>
-<span class="source-line-no">121</span><span id="line-121">     * The name ({@code org.apache.commons.logging.diagnostics.dest})</span>
-<span class="source-line-no">122</span><span id="line-122">     * of the property used to enable internal commons-logging</span>
-<span class="source-line-no">123</span><span id="line-123">     * diagnostic output, in order to get information on what logging</span>
-<span class="source-line-no">124</span><span id="line-124">     * implementations are being discovered, what class loaders they</span>
-<span class="source-line-no">125</span><span id="line-125">     * are loaded through, etc.</span>
-<span class="source-line-no">126</span><span id="line-126">     * &lt;p&gt;</span>
-<span class="source-line-no">127</span><span id="line-127">     * If a system property of this name is set then the value is</span>
-<span class="source-line-no">128</span><span id="line-128">     * assumed to be the name of a file. The special strings</span>
-<span class="source-line-no">129</span><span id="line-129">     * STDOUT or STDERR (case-sensitive) indicate output to</span>
-<span class="source-line-no">130</span><span id="line-130">     * System.out and System.err respectively.</span>
-<span class="source-line-no">131</span><span id="line-131">     * &lt;p&gt;</span>
-<span class="source-line-no">132</span><span id="line-132">     * Diagnostic logging should be used only to debug problematic</span>
-<span class="source-line-no">133</span><span id="line-133">     * configurations and should not be set in normal production use.</span>
-<span class="source-line-no">134</span><span id="line-134">     */</span>
-<span class="source-line-no">135</span><span id="line-135">    public static final String DIAGNOSTICS_DEST_PROPERTY =</span>
-<span class="source-line-no">136</span><span id="line-136">        "org.apache.commons.logging.diagnostics.dest";</span>
-<span class="source-line-no">137</span><span id="line-137"></span>
-<span class="source-line-no">138</span><span id="line-138">    /**</span>
-<span class="source-line-no">139</span><span id="line-139">     * When null (the usual case), no diagnostic output will be</span>
-<span class="source-line-no">140</span><span id="line-140">     * generated by LogFactory or LogFactoryImpl. When non-null,</span>
-<span class="source-line-no">141</span><span id="line-141">     * interesting events will be written to the specified object.</span>
-<span class="source-line-no">142</span><span id="line-142">     */</span>
-<span class="source-line-no">143</span><span id="line-143">    private static final PrintStream DIAGNOSTICS_STREAM;</span>
-<span class="source-line-no">144</span><span id="line-144"></span>
-<span class="source-line-no">145</span><span id="line-145">    /**</span>
-<span class="source-line-no">146</span><span id="line-146">     * A string that gets prefixed to every message output by the</span>
-<span class="source-line-no">147</span><span id="line-147">     * logDiagnostic method, so that users can clearly see which</span>
-<span class="source-line-no">148</span><span id="line-148">     * LogFactory class is generating the output.</span>
-<span class="source-line-no">149</span><span id="line-149">     */</span>
-<span class="source-line-no">150</span><span id="line-150">    private static final String diagnosticPrefix;</span>
-<span class="source-line-no">151</span><span id="line-151"></span>
-<span class="source-line-no">152</span><span id="line-152">    /**</span>
-<span class="source-line-no">153</span><span id="line-153">     * Setting this system property</span>
-<span class="source-line-no">154</span><span id="line-154">     * ({@code org.apache.commons.logging.LogFactory.HashtableImpl})</span>
-<span class="source-line-no">155</span><span id="line-155">     * value allows the {@code Hashtable} used to store</span>
-<span class="source-line-no">156</span><span id="line-156">     * class loaders to be substituted by an alternative implementation.</span>
-<span class="source-line-no">157</span><span id="line-157">     * &lt;p&gt;</span>
-<span class="source-line-no">158</span><span id="line-158">     * &lt;strong&gt;Note:&lt;/strong&gt; {@code LogFactory} will print:</span>
-<span class="source-line-no">159</span><span id="line-159">     * &lt;pre&gt;</span>
-<span class="source-line-no">160</span><span id="line-160">     * [ERROR] LogFactory: Load of custom hashtable failed</span>
-<span class="source-line-no">161</span><span id="line-161">     * &lt;/pre&gt;</span>
-<span class="source-line-no">162</span><span id="line-162">     * to system error and then continue using a standard Hashtable.</span>
-<span class="source-line-no">163</span><span id="line-163">     * &lt;p&gt;</span>
-<span class="source-line-no">164</span><span id="line-164">     * &lt;strong&gt;Usage:&lt;/strong&gt; Set this property when Java is invoked</span>
-<span class="source-line-no">165</span><span id="line-165">     * and {@code LogFactory} will attempt to load a new instance</span>
-<span class="source-line-no">166</span><span id="line-166">     * of the given implementation class.</span>
-<span class="source-line-no">167</span><span id="line-167">     * For example, running the following ant scriplet:</span>
-<span class="source-line-no">168</span><span id="line-168">     * &lt;pre&gt;</span>
-<span class="source-line-no">169</span><span id="line-169">     *  &amp;lt;java classname="${test.runner}" fork="yes" failonerror="${test.failonerror}"&amp;gt;</span>
-<span class="source-line-no">170</span><span id="line-170">     *     ...</span>
-<span class="source-line-no">171</span><span id="line-171">     *     &amp;lt;sysproperty</span>
-<span class="source-line-no">172</span><span id="line-172">     *        key="org.apache.commons.logging.LogFactory.HashtableImpl"</span>
-<span class="source-line-no">173</span><span id="line-173">     *        value="org.apache.commons.logging.AltHashtable"/&amp;gt;</span>
-<span class="source-line-no">174</span><span id="line-174">     *  &amp;lt;/java&amp;gt;</span>
-<span class="source-line-no">175</span><span id="line-175">     * &lt;/pre&gt;</span>
-<span class="source-line-no">176</span><span id="line-176">     * will mean that {@code LogFactory} will load an instance of</span>
-<span class="source-line-no">177</span><span id="line-177">     * {@code org.apache.commons.logging.AltHashtable}.</span>
-<span class="source-line-no">178</span><span id="line-178">     * &lt;p&gt;</span>
-<span class="source-line-no">179</span><span id="line-179">     * A typical use case is to allow a custom</span>
-<span class="source-line-no">180</span><span id="line-180">     * Hashtable implementation using weak references to be substituted.</span>
-<span class="source-line-no">181</span><span id="line-181">     * This will allow class loaders to be garbage collected without</span>
-<span class="source-line-no">182</span><span id="line-182">     * the need to release them (on 1.3+ JVMs only, of course ;).</span>
-<span class="source-line-no">183</span><span id="line-183">     */</span>
-<span class="source-line-no">184</span><span id="line-184">    public static final String HASHTABLE_IMPLEMENTATION_PROPERTY =</span>
-<span class="source-line-no">185</span><span id="line-185">        "org.apache.commons.logging.LogFactory.HashtableImpl";</span>
-<span class="source-line-no">186</span><span id="line-186"></span>
-<span class="source-line-no">187</span><span id="line-187">    /** Name used to load the weak hashtable implementation by names. */</span>
-<span class="source-line-no">188</span><span id="line-188">    private static final String WEAK_HASHTABLE_CLASSNAME =</span>
-<span class="source-line-no">189</span><span id="line-189">        "org.apache.commons.logging.impl.WeakHashtable";</span>
-<span class="source-line-no">190</span><span id="line-190"></span>
-<span class="source-line-no">191</span><span id="line-191">    /**</span>
-<span class="source-line-no">192</span><span id="line-192">     * A reference to the class loader that loaded this class. This is the</span>
-<span class="source-line-no">193</span><span id="line-193">     * same as LogFactory.class.getClassLoader(). However computing this</span>
-<span class="source-line-no">194</span><span id="line-194">     * value isn't quite as simple as that, as we potentially need to use</span>
-<span class="source-line-no">195</span><span id="line-195">     * AccessControllers etc. It's more efficient to compute it once and</span>
-<span class="source-line-no">196</span><span id="line-196">     * cache it here.</span>
-<span class="source-line-no">197</span><span id="line-197">     */</span>
-<span class="source-line-no">198</span><span id="line-198">    private static final WeakReference&lt;ClassLoader&gt; thisClassLoaderRef;</span>
-<span class="source-line-no">199</span><span id="line-199"></span>
-<span class="source-line-no">200</span><span id="line-200">    /**</span>
-<span class="source-line-no">201</span><span id="line-201">     * Maximum number of {@link ServiceLoader} errors to ignore, while</span>
-<span class="source-line-no">202</span><span id="line-202">     * looking for an implementation.</span>
-<span class="source-line-no">203</span><span id="line-203">     */</span>
-<span class="source-line-no">204</span><span id="line-204">    private static final int MAX_BROKEN_SERVICES = 3;</span>
-<span class="source-line-no">205</span><span id="line-205"></span>
-<span class="source-line-no">206</span><span id="line-206">    /**</span>
-<span class="source-line-no">207</span><span id="line-207">     * The previously constructed {@code LogFactory} instances, keyed by</span>
-<span class="source-line-no">208</span><span id="line-208">     * the {@code ClassLoader} with which it was created.</span>
-<span class="source-line-no">209</span><span id="line-209">     */</span>
-<span class="source-line-no">210</span><span id="line-210">    protected static Hashtable&lt;ClassLoader, LogFactory&gt; factories;</span>
-<span class="source-line-no">211</span><span id="line-211"></span>
-<span class="source-line-no">212</span><span id="line-212">    /**</span>
-<span class="source-line-no">213</span><span id="line-213">     * Previously constructed {@code LogFactory} instance as in the</span>
-<span class="source-line-no">214</span><span id="line-214">     * {@code factories} map, but for the case where</span>
-<span class="source-line-no">215</span><span id="line-215">     * {@code getClassLoader} returns {@code null}.</span>
-<span class="source-line-no">216</span><span id="line-216">     * This can happen when:</span>
-<span class="source-line-no">217</span><span id="line-217">     * &lt;ul&gt;</span>
-<span class="source-line-no">218</span><span id="line-218">     * &lt;li&gt;using JDK1.1 and the calling code is loaded via the system</span>
-<span class="source-line-no">219</span><span id="line-219">     *  class loader (very common)&lt;/li&gt;</span>
-<span class="source-line-no">220</span><span id="line-220">     * &lt;li&gt;using JDK1.2+ and the calling code is loaded via the boot</span>
-<span class="source-line-no">221</span><span id="line-221">     *  class loader (only likely for embedded systems work).&lt;/li&gt;</span>
-<span class="source-line-no">222</span><span id="line-222">     * &lt;/ul&gt;</span>
-<span class="source-line-no">223</span><span id="line-223">     * Note that {@code factories} is a &lt;i&gt;Hashtable&lt;/i&gt; (not a HashMap),</span>
-<span class="source-line-no">224</span><span id="line-224">     * and hashtables don't allow null as a key.</span>
-<span class="source-line-no">225</span><span id="line-225">     * @deprecated since 1.1.2</span>
-<span class="source-line-no">226</span><span id="line-226">     */</span>
-<span class="source-line-no">227</span><span id="line-227">    @Deprecated</span>
-<span class="source-line-no">228</span><span id="line-228">    protected static volatile LogFactory nullClassLoaderFactory;</span>
-<span class="source-line-no">229</span><span id="line-229"></span>
-<span class="source-line-no">230</span><span id="line-230">    static {</span>
-<span class="source-line-no">231</span><span id="line-231">        // note: it's safe to call methods before initDiagnostics (though</span>
-<span class="source-line-no">232</span><span id="line-232">        // diagnostic output gets discarded).</span>
-<span class="source-line-no">233</span><span id="line-233">        final ClassLoader thisClassLoader = getClassLoader(LogFactory.class);</span>
-<span class="source-line-no">234</span><span id="line-234">        thisClassLoaderRef = new WeakReference&lt;&gt;(thisClassLoader);</span>
-<span class="source-line-no">235</span><span id="line-235">        // In order to avoid confusion where multiple instances of JCL are</span>
-<span class="source-line-no">236</span><span id="line-236">        // being used via different class loaders within the same app, we</span>
-<span class="source-line-no">237</span><span id="line-237">        // ensure each logged message has a prefix of form</span>
-<span class="source-line-no">238</span><span id="line-238">        // [LogFactory from class loader OID]</span>
-<span class="source-line-no">239</span><span id="line-239">        //</span>
-<span class="source-line-no">240</span><span id="line-240">        // Note that this prefix should be kept consistent with that</span>
-<span class="source-line-no">241</span><span id="line-241">        // in LogFactoryImpl. However here we don't need to output info</span>
-<span class="source-line-no">242</span><span id="line-242">        // about the actual *instance* of LogFactory, as all methods that</span>
-<span class="source-line-no">243</span><span id="line-243">        // output diagnostics from this class are static.</span>
-<span class="source-line-no">244</span><span id="line-244">        String classLoaderName;</span>
-<span class="source-line-no">245</span><span id="line-245">        try {</span>
-<span class="source-line-no">246</span><span id="line-246">            if (thisClassLoader == null) {</span>
-<span class="source-line-no">247</span><span id="line-247">                classLoaderName = "BOOTLOADER";</span>
-<span class="source-line-no">248</span><span id="line-248">            } else {</span>
-<span class="source-line-no">249</span><span id="line-249">                classLoaderName = objectId(thisClassLoader);</span>
-<span class="source-line-no">250</span><span id="line-250">            }</span>
-<span class="source-line-no">251</span><span id="line-251">        } catch (final SecurityException e) {</span>
-<span class="source-line-no">252</span><span id="line-252">            classLoaderName = "UNKNOWN";</span>
-<span class="source-line-no">253</span><span id="line-253">        }</span>
-<span class="source-line-no">254</span><span id="line-254">        diagnosticPrefix = "[LogFactory from " + classLoaderName + "] ";</span>
-<span class="source-line-no">255</span><span id="line-255">        DIAGNOSTICS_STREAM = initDiagnostics();</span>
-<span class="source-line-no">256</span><span id="line-256">        logClassLoaderEnvironment(LogFactory.class);</span>
-<span class="source-line-no">257</span><span id="line-257">        factories = createFactoryStore();</span>
-<span class="source-line-no">258</span><span id="line-258">        if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">259</span><span id="line-259">            logDiagnostic("BOOTSTRAP COMPLETED");</span>
-<span class="source-line-no">260</span><span id="line-260">        }</span>
-<span class="source-line-no">261</span><span id="line-261">    }</span>
-<span class="source-line-no">262</span><span id="line-262"></span>
-<span class="source-line-no">263</span><span id="line-263">    /**</span>
-<span class="source-line-no">264</span><span id="line-264">     * Remember this factory, so later calls to LogFactory.getCachedFactory</span>
-<span class="source-line-no">265</span><span id="line-265">     * can return the previously created object (together with all its</span>
-<span class="source-line-no">266</span><span id="line-266">     * cached Log objects).</span>
-<span class="source-line-no">267</span><span id="line-267">     *</span>
-<span class="source-line-no">268</span><span id="line-268">     * @param classLoader should be the current context class loader. Note that</span>
-<span class="source-line-no">269</span><span id="line-269">     *  this can be null under some circumstances; this is ok.</span>
-<span class="source-line-no">270</span><span id="line-270">     * @param factory should be the factory to cache. This should never be null.</span>
-<span class="source-line-no">271</span><span id="line-271">     */</span>
-<span class="source-line-no">272</span><span id="line-272">    private static void cacheFactory(final ClassLoader classLoader, final LogFactory factory) {</span>
-<span class="source-line-no">273</span><span id="line-273">        // Ideally we would assert(factory != null) here. However reporting</span>
-<span class="source-line-no">274</span><span id="line-274">        // errors from within a logging implementation is a little tricky!</span>
-<span class="source-line-no">275</span><span id="line-275"></span>
-<span class="source-line-no">276</span><span id="line-276">        if (factory != null) {</span>
-<span class="source-line-no">277</span><span id="line-277">            if (classLoader == null) {</span>
-<span class="source-line-no">278</span><span id="line-278">                nullClassLoaderFactory = factory;</span>
-<span class="source-line-no">279</span><span id="line-279">            } else {</span>
-<span class="source-line-no">280</span><span id="line-280">                factories.put(classLoader, factory);</span>
-<span class="source-line-no">281</span><span id="line-281">            }</span>
-<span class="source-line-no">282</span><span id="line-282">        }</span>
-<span class="source-line-no">283</span><span id="line-283">    }</span>
-<span class="source-line-no">284</span><span id="line-284"></span>
-<span class="source-line-no">285</span><span id="line-285">    /**</span>
-<span class="source-line-no">286</span><span id="line-286">     * Implements the operations described in the Javadoc for newFactory.</span>
-<span class="source-line-no">287</span><span id="line-287">     *</span>
-<span class="source-line-no">288</span><span id="line-288">     * @param factoryClassName Factory class.</span>
-<span class="source-line-no">289</span><span id="line-289">     * @param classLoader      used to load the specified factory class. This is expected to be either the TCCL or the class loader which loaded this class.</span>
-<span class="source-line-no">290</span><span id="line-290">     *                         Note that the class loader which loaded this class might be "null" (for example, the boot loader) for embedded systems.</span>
-<span class="source-line-no">291</span><span id="line-291">     * @return either a LogFactory object or a LogConfigurationException object.</span>
-<span class="source-line-no">292</span><span id="line-292">     * @since 1.1</span>
-<span class="source-line-no">293</span><span id="line-293">     */</span>
-<span class="source-line-no">294</span><span id="line-294">    protected static Object createFactory(final String factoryClassName, final ClassLoader classLoader) {</span>
-<span class="source-line-no">295</span><span id="line-295">        // This will be used to diagnose bad configurations</span>
-<span class="source-line-no">296</span><span id="line-296">        // and allow a useful message to be sent to the user</span>
-<span class="source-line-no">297</span><span id="line-297">        Class&lt;?&gt; logFactoryClass = null;</span>
-<span class="source-line-no">298</span><span id="line-298">        try {</span>
-<span class="source-line-no">299</span><span id="line-299">            if (classLoader != null) {</span>
-<span class="source-line-no">300</span><span id="line-300">                try {</span>
-<span class="source-line-no">301</span><span id="line-301">                    // First the given class loader param (thread class loader)</span>
-<span class="source-line-no">302</span><span id="line-302"></span>
-<span class="source-line-no">303</span><span id="line-303">                    // Warning: must typecast here &amp; allow exception</span>
-<span class="source-line-no">304</span><span id="line-304">                    // to be generated/caught &amp; recast properly.</span>
-<span class="source-line-no">305</span><span id="line-305">                    logFactoryClass = classLoader.loadClass(factoryClassName);</span>
-<span class="source-line-no">306</span><span id="line-306">                    if (LogFactory.class.isAssignableFrom(logFactoryClass)) {</span>
-<span class="source-line-no">307</span><span id="line-307">                        if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">308</span><span id="line-308">                            logDiagnostic("Loaded class " + logFactoryClass.getName() + " from class loader " + objectId(classLoader));</span>
-<span class="source-line-no">309</span><span id="line-309">                        }</span>
-<span class="source-line-no">310</span><span id="line-310">                    } else //</span>
-<span class="source-line-no">311</span><span id="line-311">                    // This indicates a problem with the ClassLoader tree.</span>
-<span class="source-line-no">312</span><span id="line-312">                    // An incompatible ClassLoader was used to load the</span>
-<span class="source-line-no">313</span><span id="line-313">                    // implementation.</span>
-<span class="source-line-no">314</span><span id="line-314">                    // As the same classes</span>
-<span class="source-line-no">315</span><span id="line-315">                    // must be available in multiple class loaders,</span>
-<span class="source-line-no">316</span><span id="line-316">                    // it is very likely that multiple JCL jars are present.</span>
-<span class="source-line-no">317</span><span id="line-317">                    // The most likely fix for this</span>
-<span class="source-line-no">318</span><span id="line-318">                    // problem is to remove the extra JCL jars from the</span>
-<span class="source-line-no">319</span><span id="line-319">                    // ClassLoader hierarchy.</span>
-<span class="source-line-no">320</span><span id="line-320">                    //</span>
-<span class="source-line-no">321</span><span id="line-321">                    if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">322</span><span id="line-322">                        logDiagnostic("Factory class " + logFactoryClass.getName() + " loaded from class loader " + objectId(logFactoryClass.getClassLoader())</span>
-<span class="source-line-no">323</span><span id="line-323">                                + " does not extend '" + LogFactory.class.getName() + "' as loaded by this class loader.");</span>
-<span class="source-line-no">324</span><span id="line-324">                        logHierarchy("[BAD CL TREE] ", classLoader);</span>
-<span class="source-line-no">325</span><span id="line-325">                    }</span>
-<span class="source-line-no">326</span><span id="line-326"></span>
-<span class="source-line-no">327</span><span id="line-327">                    return logFactoryClass.getConstructor().newInstance();</span>
-<span class="source-line-no">328</span><span id="line-328"></span>
-<span class="source-line-no">329</span><span id="line-329">                } catch (final ClassNotFoundException ex) {</span>
-<span class="source-line-no">330</span><span id="line-330">                    if (classLoader == thisClassLoaderRef.get()) {</span>
-<span class="source-line-no">331</span><span id="line-331">                        // Nothing more to try, onwards.</span>
-<span class="source-line-no">332</span><span id="line-332">                        if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">333</span><span id="line-333">                            logDiagnostic("Unable to locate any class called '" + factoryClassName + "' via class loader " + objectId(classLoader));</span>
-<span class="source-line-no">334</span><span id="line-334">                        }</span>
-<span class="source-line-no">335</span><span id="line-335">                        throw ex;</span>
-<span class="source-line-no">336</span><span id="line-336">                    }</span>
-<span class="source-line-no">337</span><span id="line-337">                    // ignore exception, continue</span>
-<span class="source-line-no">338</span><span id="line-338">                } catch (final NoClassDefFoundError e) {</span>
-<span class="source-line-no">339</span><span id="line-339">                    if (classLoader == thisClassLoaderRef.get()) {</span>
-<span class="source-line-no">340</span><span id="line-340">                        // Nothing more to try, onwards.</span>
-<span class="source-line-no">341</span><span id="line-341">                        if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">342</span><span id="line-342">                            logDiagnostic("Class '" + factoryClassName + "' cannot be loaded" + " via class loader " + objectId(classLoader)</span>
-<span class="source-line-no">343</span><span id="line-343">                                    + " - it depends on some other class that cannot be found.");</span>
-<span class="source-line-no">344</span><span id="line-344">                        }</span>
-<span class="source-line-no">345</span><span id="line-345">                        throw e;</span>
-<span class="source-line-no">346</span><span id="line-346">                    }</span>
-<span class="source-line-no">347</span><span id="line-347">                    // ignore exception, continue</span>
-<span class="source-line-no">348</span><span id="line-348">                } catch (final ClassCastException e) {</span>
-<span class="source-line-no">349</span><span id="line-349">                    if (classLoader == thisClassLoaderRef.get()) {</span>
-<span class="source-line-no">350</span><span id="line-350">                        // There's no point in falling through to the code below that</span>
-<span class="source-line-no">351</span><span id="line-351">                        // tries again with thisClassLoaderRef, because we've just tried</span>
-<span class="source-line-no">352</span><span id="line-352">                        // loading with that loader (not the TCCL). Just throw an</span>
-<span class="source-line-no">353</span><span id="line-353">                        // appropriate exception here.</span>
-<span class="source-line-no">354</span><span id="line-354"></span>
-<span class="source-line-no">355</span><span id="line-355">                        final boolean implementsLogFactory = implementsLogFactory(logFactoryClass);</span>
-<span class="source-line-no">356</span><span id="line-356"></span>
-<span class="source-line-no">357</span><span id="line-357">                        //</span>
-<span class="source-line-no">358</span><span id="line-358">                        // Construct a good message: users may not actual expect that a custom implementation</span>
-<span class="source-line-no">359</span><span id="line-359">                        // has been specified. Several well known containers use this mechanism to adapt JCL</span>
-<span class="source-line-no">360</span><span id="line-360">                        // to their native logging system.</span>
-<span class="source-line-no">361</span><span id="line-361">                        //</span>
-<span class="source-line-no">362</span><span id="line-362">                        final StringBuilder msg = new StringBuilder();</span>
-<span class="source-line-no">363</span><span id="line-363">                        msg.append("The application has specified that a custom LogFactory implementation ");</span>
-<span class="source-line-no">364</span><span id="line-364">                        msg.append("should be used but Class '");</span>
-<span class="source-line-no">365</span><span id="line-365">                        msg.append(factoryClassName);</span>
-<span class="source-line-no">366</span><span id="line-366">                        msg.append("' cannot be converted to '");</span>
-<span class="source-line-no">367</span><span id="line-367">                        msg.append(LogFactory.class.getName());</span>
-<span class="source-line-no">368</span><span id="line-368">                        msg.append("'. ");</span>
-<span class="source-line-no">369</span><span id="line-369">                        if (implementsLogFactory) {</span>
-<span class="source-line-no">370</span><span id="line-370">                            msg.append("The conflict is caused by the presence of multiple LogFactory classes ");</span>
-<span class="source-line-no">371</span><span id="line-371">                            msg.append("in incompatible class loaders. ");</span>
-<span class="source-line-no">372</span><span id="line-372">                            msg.append("Background can be found in https://commons.apache.org/logging/tech.html. ");</span>
-<span class="source-line-no">373</span><span id="line-373">                            msg.append("If you have not explicitly specified a custom LogFactory then it is likely ");</span>
-<span class="source-line-no">374</span><span id="line-374">                            msg.append("that the container has set one without your knowledge. ");</span>
-<span class="source-line-no">375</span><span id="line-375">                            msg.append("In this case, consider using the commons-logging-adapters.jar file or ");</span>
-<span class="source-line-no">376</span><span id="line-376">                            msg.append("specifying the standard LogFactory from the command line. ");</span>
-<span class="source-line-no">377</span><span id="line-377">                        } else {</span>
-<span class="source-line-no">378</span><span id="line-378">                            msg.append("Please check the custom implementation. ");</span>
-<span class="source-line-no">379</span><span id="line-379">                        }</span>
-<span class="source-line-no">380</span><span id="line-380">                        msg.append("Help can be found at https://commons.apache.org/logging/troubleshooting.html.");</span>
-<span class="source-line-no">381</span><span id="line-381"></span>
-<span class="source-line-no">382</span><span id="line-382">                        if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">383</span><span id="line-383">                            logDiagnostic(msg.toString());</span>
-<span class="source-line-no">384</span><span id="line-384">                        }</span>
-<span class="source-line-no">385</span><span id="line-385"></span>
-<span class="source-line-no">386</span><span id="line-386">                        throw new ClassCastException(msg.toString());</span>
-<span class="source-line-no">387</span><span id="line-387">                    }</span>
-<span class="source-line-no">388</span><span id="line-388"></span>
-<span class="source-line-no">389</span><span id="line-389">                    // Ignore exception, continue. Presumably the class loader was the</span>
-<span class="source-line-no">390</span><span id="line-390">                    // TCCL; the code below will try to load the class via thisClassLoaderRef.</span>
-<span class="source-line-no">391</span><span id="line-391">                    // This will handle the case where the original calling class is in</span>
-<span class="source-line-no">392</span><span id="line-392">                    // a shared classpath but the TCCL has a copy of LogFactory and the</span>
-<span class="source-line-no">393</span><span id="line-393">                    // specified LogFactory implementation; we will fall back to using the</span>
-<span class="source-line-no">394</span><span id="line-394">                    // LogFactory implementation from the same class loader as this class.</span>
-<span class="source-line-no">395</span><span id="line-395">                    //</span>
-<span class="source-line-no">396</span><span id="line-396">                    // Issue: this doesn't handle the reverse case, where this LogFactory</span>
-<span class="source-line-no">397</span><span id="line-397">                    // is in the webapp, and the specified LogFactory implementation is</span>
-<span class="source-line-no">398</span><span id="line-398">                    // in a shared classpath. In that case:</span>
-<span class="source-line-no">399</span><span id="line-399">                    // (a) the class really does implement LogFactory (bad log msg above)</span>
-<span class="source-line-no">400</span><span id="line-400">                    // (b) the fallback code will result in exactly the same problem.</span>
-<span class="source-line-no">401</span><span id="line-401">                }</span>
-<span class="source-line-no">402</span><span id="line-402">            }</span>
-<span class="source-line-no">403</span><span id="line-403"></span>
-<span class="source-line-no">404</span><span id="line-404">            /*</span>
-<span class="source-line-no">405</span><span id="line-405">             * At this point, either classLoader == null, OR classLoader was unable to load factoryClass.</span>
-<span class="source-line-no">406</span><span id="line-406">             *</span>
-<span class="source-line-no">407</span><span id="line-407">             * In either case, we call Class.forName, which is equivalent to LogFactory.class.getClassLoader().load(name), that is, we ignore the class loader</span>
-<span class="source-line-no">408</span><span id="line-408">             * parameter the caller passed, and fall back to trying the class loader associated with this class. See the Javadoc for the newFactory method for</span>
-<span class="source-line-no">409</span><span id="line-409">             * more info on the consequences of this.</span>
-<span class="source-line-no">410</span><span id="line-410">             *</span>
-<span class="source-line-no">411</span><span id="line-411">             * Notes: * LogFactory.class.getClassLoader() may return 'null' if LogFactory is loaded by the bootstrap class loader.</span>
-<span class="source-line-no">412</span><span id="line-412">             */</span>
-<span class="source-line-no">413</span><span id="line-413">            // Warning: must typecast here &amp; allow exception</span>
-<span class="source-line-no">414</span><span id="line-414">            // to be generated/caught &amp; recast properly.</span>
-<span class="source-line-no">415</span><span id="line-415">            if (isDiagnosticsEnabled()) {</span>
-<span class="source-line-no">416</span><span id="line-416">                logDiagnostic(</span>
-<span class="source-line-no">417</span><span id="line-417">                        "Unable to load factory class via class loader " + objectId(classLoader) + " - trying the class loader associated with this LogFactory.");</span>
-<span class="source-line-no">418</span><span id="line-418">            }</span>
-<span class="source-line-no">419</span><span id="line-419">            logFactoryClass = Class.forName(factoryClassName);</span>
-<span class="source-line-no">420</span><span id="line-420">            return logFactoryClass.newInstance();</span>
-<span class="source-line-no">421</span><span id="line-421">        } catch (final Exception e) {</span>
-<span class="source-line-no">422</span><span id="line-422">            // Check to see if we've got a bad configuration</span>
+<span class="source-line-no">046</span><span id="line-46"> * &lt;/p&gt;</span>
+<span class="source-line-no">047</span><span id="line-47"> */</span>
+<span class="source-line-no">048</span><span id="line-48">public abstract class LogFactory {</span>
+<span class="source-line-no">049</span><span id="line-49">    // Implementation note re AccessController usage</span>
+<span class="source-line-no">050</span><span id="line-50">    //</span>
+<span class="source-line-no">051</span><span id="line-51">    // It is important to keep code invoked via an AccessController to small</span>
+<span class="source-line-no">052</span><span id="line-52">    // auditable blocks. Such code must carefully evaluate all user input</span>
+<span class="source-line-no">053</span><span id="line-53">    // (parameters, system properties, configuration file contents, etc). As an</span>
+<span class="source-line-no">054</span><span id="line-54">    // example, a Log implementation should not write to its log file</span>
+<span class="source-line-no">055</span><span id="line-55">    // with an AccessController anywhere in the call stack, otherwise an</span>
+<span class="source-line-no">056</span><span id="line-56">    // insecure application could configure the log implementation to write</span>
+<span class="source-line-no">057</span><span id="line-57">    // to a protected file using the privileges granted to JCL rather than</span>
+<span class="source-line-no">058</span><span id="line-58">    // to the calling application.</span>
+<span class="source-line-no">059</span><span id="line-59">    //</span>
+<span class="source-line-no">060</span><span id="line-60">    // Under no circumstance should a non-private method return data that is</span>
+<span class="source-line-no">061</span><span id="line-61">    // retrieved via an AccessController. That would allow an insecure application</span>
+<span class="source-line-no">062</span><span id="line-62">    // to invoke that method and obtain data that it is not permitted to have.</span>
+<span class="source-line-no">063</span><span id="line-63">    //</span>
+<span class="source-line-no">064</span><span id="line-64">    // Invoking user-supplied code with an AccessController set is not a major</span>
+<span class="source-line-no">065</span><span id="line-65">    // issue (for example, invoking the constructor of the class specified by</span>
+<span class="source-line-no">066</span><span id="line-66">    // HASHTABLE_IMPLEMENTATION_PROPERTY). That class will be in a different</span>
+<span class="source-line-no">067</span><span id="line-67">    // trust domain, and therefore must have permissions to do whatever it</span>
+<span class="source-line-no">068</span><span id="line-68">    // is trying to do regardless of the permissions granted to JCL. There is</span>
+<span class="source-line-no">069</span><span id="line-69">    // a slight issue in that untrusted code may point that environment variable</span>
+<span class="source-line-no">070</span><span id="line-70">    // to another trusted library, in which case the code runs if both that</span>
+<span class="source-line-no">071</span><span id="line-71">    // library and JCL have the necessary permissions even when the untrusted</span>
+<span class="source-line-no">072</span><span id="line-72">    // caller does not. That's a pretty hard route to exploit though.</span>
+<span class="source-line-no">073</span><span id="line-73"></span>
+<span class="source-line-no">074</span><span id="line-74">    /**</span>
+<span class="source-line-no">075</span><span id="line-75">     * The name ({@code priority}) of the key in the configuration file used to</span>
+<span class="source-line-no">076</span><span id="line-76">     * specify the priority of that particular configuration file. The associated value</span>
+<span class="source-line-no">077</span><span id="line-77">     * is a floating-point number; higher values take priority over lower values.</span>
+<span class="source-line-no">078</span><span id="line-78">     */</span>
+<span class="source-line-no">079</span><span id="line-79">    public static final String PRIORITY_KEY = "priority";</span>
+<span class="source-line-no">080</span><span id="line-80"></span>
+<span class="source-line-no">081</span><span id="line-81">    /**</span>
+<span class="source-line-no">082</span><span id="line-82">     * The name ({@code use_tccl}) of the key in the configuration file used</span>
+<span class="source-line-no">083</span><span id="line-83">     * to specify whether logging classes should be loaded via the thread</span>
+<span class="source-line-no">084</span><span id="line-84">     * context class loader (TCCL), or not. By default, the TCCL is used.</span>
+<span class="source-line-no">085</span><span id="line-85">     */</span>
+<span class="source-line-no">086</span><span id="line-86">    public static final String TCCL_KEY = "use_tccl";</span>
+<span class="source-line-no">087</span><span id="line-87"></span>
+<span class="source-line-no">088</span><span id="line-88">    /**</span>
+<span class="source-line-no">089</span><span id="line-89">     * The name ({@code org.apache.commons.logging.LogFactory}) of the property</span>
+<span class="source-line-no">090</span><span id="line-90">     * used to identify the LogFactory implementation</span>
+<span class="source-line-no">091</span><span id="line-91">     * class name. This can be used as a system property, or as an entry in a</span>
+<span class="source-line-no">092</span><span id="line-92">     * configuration properties file.</span>
+<span class="source-line-no">093</span><span id="line-93">     */</span>
+<span class="source-line-no">094</span><span id="line-94">    public static final String FACTORY_PROPERTY = "org.apache.commons.logging.LogFactory";</span>
+<span class="source-line-no">095</span><span id="line-95"></span>
+<span class="source-line-no">096</span><span id="line-96">    private static final String FACTORY_LOG4J_API = "org.apache.commons.logging.impl.Log4jApiLogFactory";</span>
+<span class="source-line-no">097</span><span id="line-97">    private static final String LOG4J_API_LOGGER = "org.apache.logging.log4j.Logger";</span>
+<span class="source-line-no">098</span><span id="line-98">    private static final String LOG4J_TO_SLF4J_BRIDGE = "org.apache.logging.slf4j.SLF4JProvider";</span>
+<span class="source-line-no">099</span><span id="line-99"></span>
+<span class="source-line-no">100</span><span id="line-100">    private static final String FACTORY_SLF4J = "org.apache.commons.logging.impl.Slf4jLogFactory";</span>
+<span class="source-line-no">101</span><span id="line-101">    private static final String SLF4J_API_LOGGER = "org.slf4j.Logger";</span>
+<span class="source-line-no">102</span><span id="line-102"></span>
+<span class="source-line-no">103</span><span id="line-103">    /**</span>
+<span class="source-line-no">104</span><span id="line-104">     * The fully qualified class name of the fallback {@code LogFactory}</span>
+<span class="source-line-no">105</span><span id="line-105">     * implementation class to use, if no other can be found.</span>
+<span class="source-line-no">106</span><span id="line-106">     */</span>
+<span class="source-line-no">107</span><span id="line-107">    public static final String FACTORY_DEFAULT = "org.apache.commons.logging.impl.LogFactoryImpl";</span>
+<span class="source-line-no">108</span><span id="line-108"></span>
+<span class="source-line-no">109</span><span id="line-109">    /**</span>
+<span class="source-line-no">110</span><span id="line-110">     * The name ({@code commons-logging.properties}) of the properties file to search for.</span>
+<span class="source-line-no">111</span><span id="line-111">     */</span>
+<span class="source-line-no">112</span><span id="line-112">    public static final String FACTORY_PROPERTIES = "commons-logging.properties";</span>
+<span class="source-line-no">113</span><span id="line-113"></span>
+<span class="source-line-no">114</span><span id="line-114">    /**</span>
+<span class="source-line-no">115</span><span id="line-115">     * JDK 1.3+ &lt;a href="https://java.sun.com/j2se/1.3/docs/guide/jar/jar.html#Service%20Provider"&gt;</span>
+<span class="source-line-no">116</span><span id="line-116">     * 'Service Provider' specification&lt;/a&gt;.</span>
+<span class="source-line-no">117</span><span id="line-117">     */</span>
+<span class="source-line-no">118</span><span id="line-118">    protected static final String SERVICE_ID =</span>
+<span class="source-line-no">119</span><span id="line-119">        "META-INF/services/org.apache.commons.logging.LogFactory";</span>
+<span class="source-line-no">120</span><span id="line-120"></span>
+<span class="source-line-no">121</span><span id="line-121">    /**</span>
+<span class="source-line-no">122</span><span id="line-122">     * The name ({@code org.apache.commons.logging.diagnostics.dest})</span>
+<span class="source-line-no">123</span><span id="line-123">     * of the property used to enable internal commons-logging</span>
+<span class="source-line-no">124</span><span id="line-124">     * diagnostic output, in order to get information on what logging</span>
+<span class="source-line-no">125</span><span id="line-125">     * implementations are being discovered, what class loaders they</span>
+<span class="source-line-no">126</span><span id="line-126">     * are loaded through, etc.</span>
+<span class="source-line-no">127</span><span id="line-127">     * &lt;p&gt;</span>
+<span class="source-line-no">128</span><span id="line-128">     * If a system property of this name is set then the value is</span>
+<span class="source-line-no">129</span><span id="line-129">     * assumed to be the name of a file. The special strings</span>
+<span class="source-line-no">130</span><span id="line-130">     * STDOUT or STDERR (case-sensitive) indicate output to</span>
+<span class="source-line-no">131</span><span id="line-131">     * System.out and System.err respectively.</span>
+<span class="source-line-no">132</span><span id="line-132">     * &lt;p&gt;</span>
+<span class="source-line-no">133</span><span id="line-133">     * Diagnostic logging should be used only to debug problematic</span>
+<span class="source-line-no">134</span><span id="line-134">     * configurations and should not be set in normal production use.</span>
+<span class="source-line-no">135</span><span id="line-135">     */</span>
+<span class="source-line-no">136</span><span id="line-136">    public static final String DIAGNOSTICS_DEST_PROPERTY =</span>
+<span class="source-line-no">137</span><span id="line-137">        "org.apache.commons.logging.diagnostics.dest";</span>
+<span class="source-line-no">138</span><span id="line-138"></span>
+<span class="source-line-no">139</span><span id="line-139">    /**</span>
+<span class="source-line-no">140</span><span id="line-140">     * When null (the usual case), no diagnostic output will be</span>
+<span class="source-line-no">141</span><span id="line-141">     * generated by LogFactory or LogFactoryImpl. When non-null,</span>
+<span class="source-line-no">142</span><span id="line-142">     * interesting events will be written to the specified object.</span>
+<span class="source-line-no">143</span><span id="line-143">     */</span>
+<span class="source-line-no">144</span><span id="line-144">    private static final PrintStream DIAGNOSTICS_STREAM;</span>
+<span class="source-line-no">145</span><span id="line-145"></span>
+<span class="source-line-no">146</span><span id="line-146">    /**</span>
+<span class="source-line-no">147</span><span id="line-147">     * A string that gets prefixed to every message output by the</span>
+<span class="source-line-no">148</span><span id="line-148">     * logDiagnostic method, so that users can clearly see which</span>
+<span class="source-line-no">149</span><span id="line-149">     * LogFactory class is generating the output.</span>
+<span class="source-line-no">150</span><span id="line-150">     */</span>
+<span class="source-line-no">151</span><span id="line-151">    private static final String diagnosticPrefix;</span>
+<span class="source-line-no">152</span><span id="line-152"></span>
+<span class="source-line-no">153</span><span id="line-153">    /**</span>
+<span class="source-line-no">154</span><span id="line-154">     * Setting this system property</span>
+<span class="source-line-no">155</span><span id="line-155">     * ({@code org.apache.commons.logging.LogFactory.HashtableImpl})</span>
+<span class="source-line-no">156</span><span id="line-156">     * value allows the {@code Hashtable} used to store</span>
+<span class="source-line-no">157</span><span id="line-157">     * class loaders to be substituted by an alternative implementation.</span>
+<span class="source-line-no">158</span><span id="line-158">     * &lt;p&gt;</span>
+<span class="source-line-no">159</span><span id="line-159">     * &lt;strong&gt;Note:&lt;/strong&gt; {@code LogFactory} will print:</span>
+<span class="source-line-no">160</span><span id="line-160">     * &lt;/p&gt;</span>
+<span class="source-line-no">161</span><span id="line-161">     * &lt;pre&gt;</span>
+<span class="source-line-no">162</span><span id="line-162">     * [ERROR] LogFactory: Load of custom hashtable failed</span>
+<span class="source-line-no">163</span><span id="line-163">     * &lt;/pre&gt;</span>
+<span class="source-line-no">164</span><span id="line-164">     * &lt;p&gt;</span>
+<span class="source-line-no">165</span><span id="line-165">     * to system error and then continue using a standard Hashtable.</span>
+<span class="source-line-no">166</span><span id="line-166">     * &lt;/p&gt;</span>
+<span class="source-line-no">167</span><span id="line-167">     * &lt;p&gt;</span>
+<span class="source-line-no">168</span><span id="line-168">     * &lt;strong&gt;Usage:&lt;/strong&gt; Set this property when Java is invoked</span>
+<span class="source-line-no">169</span><span id="line-169">     * and {@code LogFactory} will attempt to load a new instance</span>
+<span class="source-line-no">170</span><span id="line-170">     * of the given implementation class.</span>
+<span class="source-line-no">171</span><span id="line-171">     * For example, running the following ant scriplet:</span>
+<span class="source-line-no">172</span><span id="line-172">     * &lt;/p&gt;</span>
+<span class="source-line-no">173</span><span id="line-173">     * &lt;pre&gt;</span>
+<span class="source-line-no">174</span><span id="line-174">     *  &amp;lt;java classname="${test.runner}" fork="yes" failonerror="${test.failonerror}"&amp;gt;</span>
+<span class="source-line-no">175</span><span id="line-175">     *     ...</span>
+<span class="source-line-no">176</span><span id="line-176">     *     &amp;lt;sysproperty</span>
+<span class="source-line-no">177</span><span id="line-177">     *        key="org.apache.commons.logging.LogFactory.HashtableImpl"</span>
+<span class="source-line-no">178</span><span id="line-178">     *        value="org.apache.commons.logging.AltHashtable"/&amp;gt;</span>
+<span class="source-line-no">179</span><span id="line-179">     *  &amp;lt;/java&amp;gt;</span>
+<span class="source-line-no">180</span><span id="line-180">     * &lt;/pre&gt;</span>
+<span class="source-line-no">181</span><span id="line-181">     * &lt;p&gt;</span>
+<span class="source-line-no">182</span><span id="line-182">     * will mean that {@code LogFactory} will load an instance of</span>
+<span class="source-line-no">183</span><span id="line-183">     * {@code org.apache.commons.logging.AltHashtable}.</span>
+<span class="source-line-no">184</span><span id="line-184">     * &lt;/p&gt;</span>
+<span class="source-line-no">185</span><span id="line-185">     * &lt;p&gt;</span>
+<span class="source-line-no">186</span><span id="line-186">     * A typical use case is to allow a custom</span>
+<span class="source-line-no">187</span><span id="line-187">     * Hashtable implementation using weak references to be substituted.</span>
+<span class="source-line-no">188</span><span id="line-188">     * This will allow class loaders to be garbage collected without</span>
+<span class="source-line-no">189</span><span id="line-189">     * the need to release them (on 1.3+ JVMs only, of course ;).</span>
+<span class="source-line-no">190</span><span id="line-190">     * &lt;/p&gt;</span>
+<span class="source-line-no">191</span><span id="line-191">     */</span>
+<span class="source-line-no">192</span><span id="line-192">    public static final String HASHTABLE_IMPLEMENTATION_PROPERTY =</span>
+<span class="source-line-no">193</span><span id="line-193">        "org.apache.commons.logging.LogFactory.HashtableImpl";</span>
+<span class="source-line-no">194</span><span id="line-194"></span>
+<span class="source-line-no">195</span><span id="line-195">    /** Name used to load the weak hashtable implementation by names. */</span>
+<span class="source-line-no">196</span><span id="line-196">    private static final String WEAK_HASHTABLE_CLASSNAME =</span>
+<span class="source-line-no">197</span><span id="line-197">        "org.apache.commons.logging.impl.WeakHashtable";</span>
+<span class="source-line-no">198</span><span id="line-198"></span>
+<span class="source-line-no">199</span><span id="line-199">    /**</span>
+<span class="source-line-no">200</span><span id="line-200">     * A reference to the class loader that loaded this class. This is the</span>
+<span class="source-line-no">201</span><span id="line-201">     * same as LogFactory.class.getClassLoader(). However computing this</span>
+<span class="source-line-no">202</span><span id="line-202">     * value isn't quite as simple as that, as we potentially need to use</span>
+<span class="source-line-no">203</span><span id="line-203">     * AccessControllers etc. It's more efficient to compute it once and</span>
+<span class="source-line-no">204</span><span id="line-204">     * cache it here.</span>
+<span class="source-line-no">205</span><span id="line-205">     */</span>
+<span class="source-line-no">206</span><span id="line-206">    private static final WeakReference&lt;ClassLoader&gt; thisClassLoaderRef;</span>
+<span class="source-line-no">207</span><span id="line-207"></span>
+<span class="source-line-no">208</span><span id="line-208">    /**</span>
+<span class="source-line-no">209</span><span id="line-209">     * Maximum number of {@link ServiceLoader} errors to ignore, while</span>
+<span class="source-line-no">210</span><span id="line-210">     * looking for an implementation.</span>
+<span class="source-line-no">211</span><span id="line-211">     */</span>
+<span class="source-line-no">212</span><span id="line-212">    private static final int MAX_BROKEN_SERVICES = 3;</span>
+<span class="source-line-no">213</span><span id="line-213"></span>
+<span class="source-line-no">214</span><span id="line-214">    /**</span>
+<span class="source-line-no">215</span><span id="line-215">     * The previously constructed {@code LogFactory} instances, keyed by</span>
+<span class="source-line-no">216</span><span id="line-216">     * the {@code ClassLoader} with which it was created.</span>
+<span class="source-line-no">217</span><span id="line-217">     */</span>
+<span class="source-line-no">218</span><span id="line-218">    protected static Hashtable&lt;ClassLoader, LogFactory&gt; factories;</span>
+<span class="source-line-no">219</span><span id="line-219"></span>
+<span class="source-line-no">220</span><span id="line-220">    /**</span>
+<span class="source-line-no">221</span><span id="line-221">     * Previously constructed {@code LogFactory} instance as in the</span>
+<span class="source-line-no">222</span><span id="line-222">     * {@code factories} map, but for the case where</span>
+<span class="source-line-no">223</span><span id="line-223">     * {@code getClassLoader} returns {@code null}.</span>
+<span class="source-line-no">224</span><span id="line-224">     * This can happen when:</span>
+<span class="source-line-no">225</span><span id="line-225">     * &lt;ul&gt;</span>
+<span class="source-line-no">226</span><span id="line-226">     * &lt;li&gt;using JDK1.1 and the calling code is loaded via the system</span>
+<span class="source-line-no">227</span><span id="line-227">     *  class loader (very common)&lt;/li&gt;</span>
+<span class="source-line-no">228</span><span id="line-228">     * &lt;li&gt;using JDK1.2+ and the calling code is loaded via the boot</span>
+<span class="source-line-no">229</span><span id="line-229">     *  class loader (only likely for embedded systems work).&lt;/li&gt;</span>
+<span class="source-line-no">230</span><span id="line-230">     * &lt;/ul&gt;</span>
+<span class="source-line-no">231</span><span id="line-231">     * Note that {@code factories} is a &lt;i&gt;Hashtable&lt;/i&gt; (not a HashMap),</span>
+<span class="source-line-no">232</span><span id="line-232">     * and hashtables don't allow null as a key.</span>
+<span class="source-line-no">233</span><span id="line-233">     * @deprecated since 1.1.2</span>
+<span class="source-line-no">234</span><span id="line-234">     */</span>
+<span class="source-line-no">235</span><span id="line-235">    @Deprecated</span>
+<span class="source-line-no">236</span><span id="line-236">    protected static volatile LogFactory nullClassLoaderFactory;</span>
+<span class="source-line-no">237</span><span id="line-237"></span>
+<span class="source-line-no">238</span><span id="line-238">    static {</span>
+<span class="source-line-no">239</span><span id="line-239">        // note: it's safe to call methods before initDiagnostics (though</span>
+<span class="source-line-no">240</span><span id="line-240">        // diagnostic output gets discarded).</span>
+<span class="source-line-no">241</span><span id="line-241">        final ClassLoader thisClassLoader = getClassLoader(LogFactory.class);</span>
+<span class="source-line-no">242</span><span id="line-242">        thisClassLoaderRef = new WeakReference&lt;&gt;(thisClassLoader);</span>
+<span class="source-line-no">243</span><span id="line-243">        // In order to avoid confusion where multiple instances of JCL are</span>
+<span class="source-line-no">244</span><span id="line-244">        // being used via different class loaders within the same app, we</span>
+<span class="source-line-no">245</span><span id="line-245">        // ensure each logged message has a prefix of form</span>
+<span class="source-line-no">246</span><span id="line-246">        // [LogFactory from class loader OID]</span>
+<span class="source-line-no">247</span><span id="line-247">        //</span>
+<span class="source-line-no">248</span><span id="line-248">        // Note that this prefix should be kept consistent with that</span>
+<span class="source-line-no">249</span><span id="line-249">        // in LogFactoryImpl. However here we don't need to output info</span>
+<span class="source-line-no">250</span><span id="line-250">        // about the actual *instance* of LogFactory, as all methods that</span>
+<span class="source-line-no">251</span><span id="line-251">        // output diagnostics from this class are static.</span>
+<span class="source-line-no">252</span><span id="line-252">        String classLoaderName;</span>
+<span class="source-line-no">253</span><span id="line-253">        try {</span>
+<span class="source-line-no">254</span><span id="line-254">            if (thisClassLoader == null) {</span>
+<span class="source-line-no">255</span><span id="line-255">                classLoaderName = "BOOTLOADER";</span>
+<span class="source-line-no">256</span><span id="line-256">            } else {</span>
+<span class="source-line-no">257</span><span id="line-257">                classLoaderName = objectId(thisClassLoader);</span>
+<span class="source-line-no">258</span><span id="line-258">            }</span>
+<span class="source-line-no">259</span><span id="line-259">        } catch (final SecurityException e) {</span>
+<span class="source-line-no">260</span><span id="line-260">            classLoaderName = "UNKNOWN";</span>
+<span class="source-line-no">261</span><span id="line-261">        }</span>
+<span class="source-line-no">262</span><span id="line-262">        diagnosticPrefix = "[LogFactory from " + classLoaderName + "] ";</span>
+<span class="source-line-no">263</span><span id="line-263">        DIAGNOSTICS_STREAM = initDiagnostics();</span>
+<span class="source-line-no">264</span><span id="line-264">        logClassLoaderEnvironment(LogFactory.class);</span>
+<span class="source-line-no">265</span><span id="line-265">        factories = createFactoryStore();</span>
+<span class="source-line-no">266</span><span id="line-266">        if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">267</span><span id="line-267">            logDiagnostic("BOOTSTRAP COMPLETED");</span>
+<span class="source-line-no">268</span><span id="line-268">        }</span>
+<span class="source-line-no">269</span><span id="line-269">    }</span>
+<span class="source-line-no">270</span><span id="line-270"></span>
+<span class="source-line-no">271</span><span id="line-271">    /**</span>
+<span class="source-line-no">272</span><span id="line-272">     * Remember this factory, so later calls to LogFactory.getCachedFactory</span>
+<span class="source-line-no">273</span><span id="line-273">     * can return the previously created object (together with all its</span>
+<span class="source-line-no">274</span><span id="line-274">     * cached Log objects).</span>
+<span class="source-line-no">275</span><span id="line-275">     *</span>
+<span class="source-line-no">276</span><span id="line-276">     * @param classLoader should be the current context class loader. Note that</span>
+<span class="source-line-no">277</span><span id="line-277">     *  this can be null under some circumstances; this is ok.</span>
+<span class="source-line-no">278</span><span id="line-278">     * @param factory should be the factory to cache. This should never be null.</span>
+<span class="source-line-no">279</span><span id="line-279">     */</span>
+<span class="source-line-no">280</span><span id="line-280">    private static void cacheFactory(final ClassLoader classLoader, final LogFactory factory) {</span>
+<span class="source-line-no">281</span><span id="line-281">        // Ideally we would assert(factory != null) here. However reporting</span>
+<span class="source-line-no">282</span><span id="line-282">        // errors from within a logging implementation is a little tricky!</span>
+<span class="source-line-no">283</span><span id="line-283"></span>
+<span class="source-line-no">284</span><span id="line-284">        if (factory != null) {</span>
+<span class="source-line-no">285</span><span id="line-285">            if (classLoader == null) {</span>
+<span class="source-line-no">286</span><span id="line-286">                nullClassLoaderFactory = factory;</span>
+<span class="source-line-no">287</span><span id="line-287">            } else {</span>
+<span class="source-line-no">288</span><span id="line-288">                factories.put(classLoader, factory);</span>
+<span class="source-line-no">289</span><span id="line-289">            }</span>
+<span class="source-line-no">290</span><span id="line-290">        }</span>
+<span class="source-line-no">291</span><span id="line-291">    }</span>
+<span class="source-line-no">292</span><span id="line-292"></span>
+<span class="source-line-no">293</span><span id="line-293">    /**</span>
+<span class="source-line-no">294</span><span id="line-294">     * Implements the operations described in the Javadoc for newFactory.</span>
+<span class="source-line-no">295</span><span id="line-295">     *</span>
+<span class="source-line-no">296</span><span id="line-296">     * @param factoryClassName Factory class.</span>
+<span class="source-line-no">297</span><span id="line-297">     * @param classLoader      used to load the specified factory class. This is expected to be either the TCCL or the class loader which loaded this class.</span>
+<span class="source-line-no">298</span><span id="line-298">     *                         Note that the class loader which loaded this class might be "null" (for example, the boot loader) for embedded systems.</span>
+<span class="source-line-no">299</span><span id="line-299">     * @return either a LogFactory object or a LogConfigurationException object.</span>
+<span class="source-line-no">300</span><span id="line-300">     * @since 1.1</span>
+<span class="source-line-no">301</span><span id="line-301">     */</span>
+<span class="source-line-no">302</span><span id="line-302">    protected static Object createFactory(final String factoryClassName, final ClassLoader classLoader) {</span>
+<span class="source-line-no">303</span><span id="line-303">        // This will be used to diagnose bad configurations</span>
+<span class="source-line-no">304</span><span id="line-304">        // and allow a useful message to be sent to the user</span>
+<span class="source-line-no">305</span><span id="line-305">        Class&lt;?&gt; logFactoryClass = null;</span>
+<span class="source-line-no">306</span><span id="line-306">        try {</span>
+<span class="source-line-no">307</span><span id="line-307">            if (classLoader != null) {</span>
+<span class="source-line-no">308</span><span id="line-308">                try {</span>
+<span class="source-line-no">309</span><span id="line-309">                    // First the given class loader param (thread class loader)</span>
+<span class="source-line-no">310</span><span id="line-310"></span>
+<span class="source-line-no">311</span><span id="line-311">                    // Warning: must typecast here &amp; allow exception</span>
+<span class="source-line-no">312</span><span id="line-312">                    // to be generated/caught &amp; recast properly.</span>
+<span class="source-line-no">313</span><span id="line-313">                    logFactoryClass = classLoader.loadClass(factoryClassName);</span>
+<span class="source-line-no">314</span><span id="line-314">                    if (LogFactory.class.isAssignableFrom(logFactoryClass)) {</span>
+<span class="source-line-no">315</span><span id="line-315">                        if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">316</span><span id="line-316">                            logDiagnostic("Loaded class " + logFactoryClass.getName() + " from class loader " + objectId(classLoader));</span>
+<span class="source-line-no">317</span><span id="line-317">                        }</span>
+<span class="source-line-no">318</span><span id="line-318">                    } else //</span>
+<span class="source-line-no">319</span><span id="line-319">                    // This indicates a problem with the ClassLoader tree.</span>
+<span class="source-line-no">320</span><span id="line-320">                    // An incompatible ClassLoader was used to load the</span>
+<span class="source-line-no">321</span><span id="line-321">                    // implementation.</span>
+<span class="source-line-no">322</span><span id="line-322">                    // As the same classes</span>
+<span class="source-line-no">323</span><span id="line-323">                    // must be available in multiple class loaders,</span>
+<span class="source-line-no">324</span><span id="line-324">                    // it is very likely that multiple JCL jars are present.</span>
+<span class="source-line-no">325</span><span id="line-325">                    // The most likely fix for this</span>
+<span class="source-line-no">326</span><span id="line-326">                    // problem is to remove the extra JCL jars from the</span>
+<span class="source-line-no">327</span><span id="line-327">                    // ClassLoader hierarchy.</span>
+<span class="source-line-no">328</span><span id="line-328">                    //</span>
+<span class="source-line-no">329</span><span id="line-329">                    if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">330</span><span id="line-330">                        logDiagnostic("Factory class " + logFactoryClass.getName() + " loaded from class loader " + objectId(logFactoryClass.getClassLoader())</span>
+<span class="source-line-no">331</span><span id="line-331">                                + " does not extend '" + LogFactory.class.getName() + "' as loaded by this class loader.");</span>
+<span class="source-line-no">332</span><span id="line-332">                        logHierarchy("[BAD CL TREE] ", classLoader);</span>
+<span class="source-line-no">333</span><span id="line-333">                    }</span>
+<span class="source-line-no">334</span><span id="line-334"></span>
+<span class="source-line-no">335</span><span id="line-335">                    return logFactoryClass.getConstructor().newInstance();</span>
+<span class="source-line-no">336</span><span id="line-336"></span>
+<span class="source-line-no">337</span><span id="line-337">                } catch (final ClassNotFoundException ex) {</span>
+<span class="source-line-no">338</span><span id="line-338">                    if (classLoader == thisClassLoaderRef.get()) {</span>
+<span class="source-line-no">339</span><span id="line-339">                        // Nothing more to try, onwards.</span>
+<span class="source-line-no">340</span><span id="line-340">                        if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">341</span><span id="line-341">                            logDiagnostic("Unable to locate any class called '" + factoryClassName + "' via class loader " + objectId(classLoader));</span>
+<span class="source-line-no">342</span><span id="line-342">                        }</span>
+<span class="source-line-no">343</span><span id="line-343">                        throw ex;</span>
+<span class="source-line-no">344</span><span id="line-344">                    }</span>
+<span class="source-line-no">345</span><span id="line-345">                    // ignore exception, continue</span>
+<span class="source-line-no">346</span><span id="line-346">                } catch (final NoClassDefFoundError e) {</span>
+<span class="source-line-no">347</span><span id="line-347">                    if (classLoader == thisClassLoaderRef.get()) {</span>
+<span class="source-line-no">348</span><span id="line-348">                        // Nothing more to try, onwards.</span>
+<span class="source-line-no">349</span><span id="line-349">                        if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">350</span><span id="line-350">                            logDiagnostic("Class '" + factoryClassName + "' cannot be loaded" + " via class loader " + objectId(classLoader)</span>
+<span class="source-line-no">351</span><span id="line-351">                                    + " - it depends on some other class that cannot be found.");</span>
+<span class="source-line-no">352</span><span id="line-352">                        }</span>
+<span class="source-line-no">353</span><span id="line-353">                        throw e;</span>
+<span class="source-line-no">354</span><span id="line-354">                    }</span>
+<span class="source-line-no">355</span><span id="line-355">                    // ignore exception, continue</span>
+<span class="source-line-no">356</span><span id="line-356">                } catch (final ClassCastException e) {</span>
+<span class="source-line-no">357</span><span id="line-357">                    if (classLoader == thisClassLoaderRef.get()) {</span>
+<span class="source-line-no">358</span><span id="line-358">                        // There's no point in falling through to the code below that</span>
+<span class="source-line-no">359</span><span id="line-359">                        // tries again with thisClassLoaderRef, because we've just tried</span>
+<span class="source-line-no">360</span><span id="line-360">                        // loading with that loader (not the TCCL). Just throw an</span>
+<span class="source-line-no">361</span><span id="line-361">                        // appropriate exception here.</span>
+<span class="source-line-no">362</span><span id="line-362"></span>
+<span class="source-line-no">363</span><span id="line-363">                        final boolean implementsLogFactory = implementsLogFactory(logFactoryClass);</span>
+<span class="source-line-no">364</span><span id="line-364"></span>
+<span class="source-line-no">365</span><span id="line-365">                        //</span>
+<span class="source-line-no">366</span><span id="line-366">                        // Construct a good message: users may not actual expect that a custom implementation</span>
+<span class="source-line-no">367</span><span id="line-367">                        // has been specified. Several well known containers use this mechanism to adapt JCL</span>
+<span class="source-line-no">368</span><span id="line-368">                        // to their native logging system.</span>
+<span class="source-line-no">369</span><span id="line-369">                        //</span>
+<span class="source-line-no">370</span><span id="line-370">                        final StringBuilder msg = new StringBuilder();</span>
+<span class="source-line-no">371</span><span id="line-371">                        msg.append("The application has specified that a custom LogFactory implementation ");</span>
+<span class="source-line-no">372</span><span id="line-372">                        msg.append("should be used but Class '");</span>
+<span class="source-line-no">373</span><span id="line-373">                        msg.append(factoryClassName);</span>
+<span class="source-line-no">374</span><span id="line-374">                        msg.append("' cannot be converted to '");</span>
+<span class="source-line-no">375</span><span id="line-375">                        msg.append(LogFactory.class.getName());</span>
+<span class="source-line-no">376</span><span id="line-376">                        msg.append("'. ");</span>
+<span class="source-line-no">377</span><span id="line-377">                        if (implementsLogFactory) {</span>
+<span class="source-line-no">378</span><span id="line-378">                            msg.append("The conflict is caused by the presence of multiple LogFactory classes ");</span>
+<span class="source-line-no">379</span><span id="line-379">                            msg.append("in incompatible class loaders. ");</span>
+<span class="source-line-no">380</span><span id="line-380">                            msg.append("Background can be found in https://commons.apache.org/logging/tech.html. ");</span>
+<span class="source-line-no">381</span><span id="line-381">                            msg.append("If you have not explicitly specified a custom LogFactory then it is likely ");</span>
+<span class="source-line-no">382</span><span id="line-382">                            msg.append("that the container has set one without your knowledge. ");</span>
+<span class="source-line-no">383</span><span id="line-383">                            msg.append("In this case, consider using the commons-logging-adapters.jar file or ");</span>
+<span class="source-line-no">384</span><span id="line-384">                            msg.append("specifying the standard LogFactory from the command line. ");</span>
+<span class="source-line-no">385</span><span id="line-385">                        } else {</span>
+<span class="source-line-no">386</span><span id="line-386">                            msg.append("Please check the custom implementation. ");</span>
+<span class="source-line-no">387</span><span id="line-387">                        }</span>
+<span class="source-line-no">388</span><span id="line-388">                        msg.append("Help can be found at https://commons.apache.org/logging/troubleshooting.html.");</span>
+<span class="source-line-no">389</span><span id="line-389"></span>
+<span class="source-line-no">390</span><span id="line-390">                        if (isDiagnosticsEnabled()) {</span>
+<span class="source-line-no">391</span><span id="line-391">                            logDiagnostic(msg.toString());</span>
+<span class="source-line-no">392</span><span id="line-392">                        }</span>
+<span class="source-line-no">393</span><span id="line-393"></span>
+<span class="source-line-no">394</span><span id="line-394">                        throw new ClassCastException(msg.toString());</span>
+<span class="source-line-no">395</span><span id="line-395">                    }</span>
+<span class="source-line-no">396</span><span id="line-396"></span>
+<span class="source-line-no">397</span><span id="line-397">                    // Ignore exception, continue. Presumably the class loader was the</span>
+<span class="source-line-no">398</span><span id="line-398">                    // TCCL; the code below will try to load the class via thisClassLoaderRef.</span>
+<span class="source-line-no">399</span><span id="line-399">                    // This will handle the case where the original calling class is in</span>
+<span class="source-line-no">400</span><span id="line-400">                    // a shared classpath but the TCCL has a copy of LogFactory and the</span>
+<span class="source-line-no">401</span><span id="line-401">                    // specified LogFactory implementation; we will fall back to using the</span>
+<span class="source-line-no">402</span><span id="line-402">                    // LogFactory implementation from the same class loader as this class.</span>
+<span class="source-line-no">403</span><span id="line-403">                    //</span>
+<span class="source-line-no">404</span><span id="line-404">                    // Issue: this doesn't handle the reverse case, where this LogFactory</span>
+<span class="source-line-no">405</span><span id="line-405">                    // is in the webapp, and the specified LogFactory implementation is</span>
+<span class="source-line-no">406</span><span id="line-406">                    // in a shared classpath. In that case:</span>
+<span class="source-line-no">407</span><span id="line-407">                    // (a) the class really does implement LogFactory (bad log msg above)</span>
+<span class="source-line-no">408</span><span id="line-408">                    // (b) the fallback code will result in exactly the same problem.</span>
+<span class="source-line-no">409</span><span id="line-409">                }</span>
+<span class="source-line-no">410</span><span id="line-410">            }</span>
+<span class="source-line-no">411</span><span id="line-411"></span>
+<span class="source-line-no">412</span><span id="line-412">            /*</span>
+<span class="source-line-no">413</span><span id="line-413">             * At this point, either classLoader == null, OR classLoader was unable to load factoryClass.</span>
+<span class="source-line-no">414</span><span id="line-414">             *</span>
+<span class="source-line-no">415</span><span id="line-415">             * In either case, we call Class.forName, which is equivalent to LogFactory.class.getClassLoader().load(name), that is, we ignore the class loader</span>
+<span class="source-line-no">416</span><span id="line-416">             * parameter the caller passed, and fall back to trying the class loader associated with this class. See the Javadoc for the newFactory method for</span>
+<span class="source-line-no">417</span><span id="line-417">             * more info on the consequences of this.</span>
+<span class="source-line-no">418</span><span id="line-418">             *</span>

[... 2410 lines stripped ...]