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[JBoss-dev] [ jboss-Bugs-877172 ] NullPointerException in LoadMgr3
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From: SourceForge.net <no...@so...> - 2004-01-20 22:45:15
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Bugs item #877172, was opened at 2004-01-14 13:59 Message generated for change (Comment added) made by starksm You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376685&aid=877172&group_id=22866 Category: JBossMX Group: v3.2 Status: Open Resolution: None Priority: 5 Submitted By: Tim McCune (javajedi) Assigned to: Scott M Stark (starksm) Summary: NullPointerException in LoadMgr3 Initial Comment: I get this error out of JBoss 3.2.2 on a fairly regular basis. I'm still not sure exactly how to reproduce it, but since it's an NPE, I'm hoping that someone can track down what would cause it to happen fairly easily. Once it occurs for a particular class, the only fix is to restart JBoss. I never had this problem on 3.2.0. java.lang.NullPointerException at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:119) at org.jboss.mx.loading.UnifiedClassLoader3.loadClassImpl(UnifiedClassLoader3.java:169) at org.jboss.mx.loading.UnifiedClassLoader3.loadClass(UnifiedClassLoader3.java:123) at java.lang.ClassLoader.loadClass(ClassLoader.java:235) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302) Looking at the code, the UnifiedLoaderRepository3 that is passed into beginLoadTask as the 2nd parameter must be null. UnifiedClassLoader3, line 118 does a null check for repository just a few lines before calling loadClassImpl, so I'm assuming that this is a valid state for the class loader to be in. That would mean that beginLoadTask in LoadMgr3 needs to handle the situation where repository is null. ---------------------------------------------------------------------- >Comment By: Scott M Stark (starksm) Date: 2004-01-20 14:45 Message: Logged In: YES user_id=175228 So where is the com.mysql.jdbc.Connection class coming from in the deployment, and has there been a redeployment of anything in the encompassing deployment? The current 3.2 codebase has additional debug level logging to track when a class loader is removed from the repository as well as a fix for delaying the removal of a class loader from its repository until the top level deployment have been destroyed. ---------------------------------------------------------------------- Comment By: Tim McCune (javajedi) Date: 2004-01-20 12:22 Message: Logged In: YES user_id=62441 Ok, stack trace attached. ---------------------------------------------------------------------- Comment By: Scott M Stark (starksm) Date: 2004-01-15 04:54 Message: Logged In: YES user_id=175228 Add the full stack trace as an attachment so I can see where the load attempt is originating from. An NPE in LoadMgr indicates that the UnifiedClassLoader3 has been removed from the repository in between the loadClass class and the delegation to LoadMgr. The only cause of this would be destruction of the associated deployment due to a redeploy. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376685&aid=877172&group_id=22866 |