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Posted to java-dev@axis.apache.org by "Hudson (JIRA)" <ji...@apache.org> on 2016/07/02 13:35:11 UTC
[jira] [Commented] (AXIS2-4349) Child first class loading
[ https://issues.apache.org/jira/browse/AXIS2-4349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15360176#comment-15360176 ]
Hudson commented on AXIS2-4349:
-------------------------------
SUCCESS: Integrated in Axis2 #3571 (See [https://builds.apache.org/job/Axis2/3571/])
AXIS2-5792: Use the same class loaders on Windows as on Unix, to make EnableChildFirstClassLoading work (AXIS2-4349 only implementd that feature for Unix). This effectively reverts the change implemented in AXIS2-4072 and instead levarages the fact that on recent Java versions, URLClassLoader has a close() method. (veithen: rev 1751057)
* axis2/modules/kernel/src/org/apache/axis2/classloader/AbstractResourceHandle.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/AbstractUrlResourceLocation.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/DirectoryResourceHandle.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/DirectoryResourceLocation.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/IoUtil.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarFileClassLoader.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarFileUrlConnection.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarFileUrlStreamHandler.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarResourceHandle.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarResourceLocation.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/JarStreamHandlerFactory.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/ResourceEnumeration.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/ResourceFinder.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/ResourceHandle.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/ResourceLocation.java
* axis2/modules/kernel/src/org/apache/axis2/classloader/UrlResourceFinder.java
* axis2/modules/kernel/src/org/apache/axis2/deployment/DeploymentEngine.java
* axis2/modules/kernel/src/org/apache/axis2/deployment/util/Utils.java
* axis2/modules/kernel/test/org/apache/axis2/classloader
> Child first class loading
> -------------------------
>
> Key: AXIS2-4349
> URL: https://issues.apache.org/jira/browse/AXIS2-4349
> Project: Axis2
> Issue Type: Improvement
> Reporter: Amila Chinthaka Suriarachchi
> Fix For: 1.5.5, 1.6.0
>
> Attachments: child_first_class_loading.patch, classloaderpatch.txt
>
>
> Currently Axis2 follows the parent first class loading for service and module loading.
> The reason for this is it uses DeploymentClassLoader loader which is extended from the ClassLoader class.
> The loadClass method of the ClassLoader class looks like this.
> protected synchronized Class<?> loadClass(String name, boolean resolve)
> throws ClassNotFoundException
> {
> // First, check if the class has already been loaded
> Class c = findLoadedClass(name);
> if (c == null) {
> try {
> if (parent != null) {
> c = parent.loadClass(name, false);
> } else {
> c = findBootstrapClass0(name);
> }
> } catch (ClassNotFoundException e) {
> // If still not found, then invoke findClass in order
> // to find the class.
> c = findClass(name);
> }
> }
> if (resolve) {
> resolveClass(c);
> }
> return c;
> }
> it first check for parent class loader classes and then for its classes. So we can add child first class loading simply reversing this order in a override loadClass method as follows.
> protected synchronized Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException {
> Class c = findLoadedClass(name);
> if (c == null) {
> try {
> c = findClass(name);
> } catch (Exception e) {
> c = super.loadClass(name, resolve);
> }
> }
> return c;
> }
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