Class Loader Issues
I am trying to load classes on the fly according to a full Java class name. I have a class loading strategy of:
Get:
ClassLoader threadLoader = Thread.currentThread().getContextClassLoader(); ClassLoader callLoader = context.getCallingClass().getClassLoader();
If either class loader is null, return the other one. Otherwise if one is the parent of the other use the child, otherwise try them both.
I am having trouble with the following senario: All classes are packaged in my war file.
I load a class using my loading strategy, which in turn loads another class using the same strategy.
On windows this works fine, on Linux I can a ClassNotFoundException when loading the second class:
37979 java.lang.ClassNotFoundException: No ClassLoaders found for: com.videocoding.vicop.requestQueue.handlers.wap.MediaBurst^M 37980 37981 at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:292) 37982 at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:464) 37983 at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:374) 37984 at java.lang.ClassLoader.loadClass(ClassLoader.java:251) 37985 at com.videocoding.vicop.common.ClassLoaderUtils.loadClass(ClassLoaderUtils.java:68)
From my logging the class loader used can be seen:
2005-04-20 16:00:12,033 INFO [com.videocoding.vicop.common.ClassLoaderUtils] Received ClassLoader org.jboss.web.tomcat.tc5.WebCtxLoader$ENCLoader with hashcode 6115379
Compare this logging to the successful class load:
2005-04-20 16:00:12,017 DEBUG [com.videocoding.vicop.common.ClassLoaderUtils] Loading class com.videocoding.vicop.triggers.handlers.PlayerPushHandler 2005-04-20 16:00:12,017 INFO [com.videocoding.vicop.common.ClassLoaderUtils] No common parents, returning threadLoader 2005-04-20 16:00:12,017 INFO [com.videocoding.vicop.common.ClassLoaderUtils] Received ClassLoader org.jboss.web.tomcat.tc5.WebCtxLoader$ENCLoader with hashcode 6115379
It can be seen that the same class loader is being used. When we look in the working directory we see:
[root]# pwd /opt/jboss-4.0.1sp1/server/default/tmp/deploy/tmp16487vicop.war/WEB-INF/classes [root]# ls com/videocoding/vicop/triggers/handlers/ AbstractHandler.class DefaultHandler.class PlayerPushHandler.class TriggerHandler.class [root]# ls com/videocoding/vicop/requestQueue/handlers/wap/ MediaBurst.class WapPushHandler.class
so both classes are in the same classpath directory and are using the same class loader.
Additionally this all works on Windows. Windows set up is:
java version "1.5.0_02" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09) Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode, sharing) 16:22:52,921 INFO [Server] Starting JBoss (MX MicroKernel)... 16:22:52,921 INFO [Server] Release ID: JBoss [Zion] 4.0.1sp1 (build: CVSTag=JBoss_4_0_1_SP1 date=200502160314)
and linux set up is
java version "1.5.0_02" Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09) Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode, sharing) 12:39:06,566 INFO [Server] Starting JBoss (MX MicroKernel)... 12:39:06,567 INFO [Server] Release ID: JBoss [Zion] 4.0.1sp1 (build: CVSTag=JBoss_4_0_1_SP1 date=200504161944)
Any ideas or places to look would be very welcome because I am just about out of ideas.
Thank you for your time.
James.
I am sure this will be something daft, but for the life of me I can not work out what it is.
