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Posted to commits@camel.apache.org by bu...@apache.org on 2012/08/14 17:17:38 UTC
svn commit: r828911 - in /websites/production/camel/content:
cache/main.pageCache why-is-the-exception-null-when-i-use-onexception.html
Author: buildbot
Date: Tue Aug 14 15:17:38 2012
New Revision: 828911
Log:
Production update by buildbot for camel
Added:
websites/production/camel/content/why-is-the-exception-null-when-i-use-onexception.html
Modified:
websites/production/camel/content/cache/main.pageCache
Modified: websites/production/camel/content/cache/main.pageCache
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Added: websites/production/camel/content/why-is-the-exception-null-when-i-use-onexception.html
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+ Apache Camel: Why is the exception null when I use onException
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+<div class="wiki-content maincontent"><h2><a shape="rect" name="WhyistheexceptionnullwhenIuseonException-WhyistheexceptionnullwhenIuseonException%3F"></a>Why is the exception null when I use onException?</h2>
+
+<p>If you use <tt>onException</tt> to handle exceptions, such as shown below:</p>
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<pre class="code-java">
+.onException(Exception.class).handled(<span class="code-keyword">true</span>)
+ .process(<span class="code-keyword">new</span> Processor() {
+ @Override
+ <span class="code-keyword">public</span> void process(Exchange exchange) <span class="code-keyword">throws</span> Exception {
+ Exception cause = exchange.getException());
+ <span class="code-comment">// why cause exception is <span class="code-keyword">null</span> ???
+</span> }
+ })
+.end()
+</pre>
+</div></div>
+
+<p>Then make notice that because you use <tt>handled(true)</tt>, then the caused exception is no longer available from <tt>exchange.getException()</tt>, because we told Camel that we will handle the exception.</p>
+
+<p>Instead you can access the caused exception from a property on the exchange with the key <tt>Exchange.EXCEPTION_CAUGT</tt>, as shown below:</p>
+<div class="code panel" style="border-width: 1px;"><div class="codeContent panelContent">
+<pre class="code-java">
+.onException(Exception.class).handled(<span class="code-keyword">true</span>)
+ .process(<span class="code-keyword">new</span> Processor() {
+ @Override
+ <span class="code-keyword">public</span> void process(Exchange exchange) <span class="code-keyword">throws</span> Exception {
+ Exception cause = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
+ <span class="code-comment">// we now have the caused exception
+</span> }
+ })
+.end()
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