Bugs item #617574, was opened at 2002-10-02 16:20 You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376685&aid=617574&group_id=22866
Category: JBossMX Group: v3.2 Status: Open Resolution: None Priority: 5 Submitted By: Michael Bartmann (bartmann) Assigned to: Nobody/Anonymous (nobody) Summary: Classloader deadlock Initial Comment: We have for the third time in quite some weeks experienced a partial lookup of the JBoss server (some services responsive, others not). The bug is not deterministically reproducible for us. But this time we luckily had a debugger online and drilled down to what seems to be a classloader deadlock. This was under NT4.0 (it happend before under W2000 also) We used Branch_3_2 (checkout 12 hours before it went beta) under JDK1.4.0-b92. It happened when many separate ear-scoped mbeans and dependent MDBs got deployed in a short time. Many of the mbeans are JMSProviders and the MDBs recieve external messages almost immediatelly after startup, so they all try to load classes simultaneously. Most of the threads were waiting for a lock at line 84 in the loadClass() of HeirarchicalLoaderRepository2; only one threads was locked in loadClass() of java.lang.ClassLoader. The two threads which seem to have caused the deadlock were "Thread-47" (java.util.TimerThread) and "Thread Pool Worker-0" (EDU.oswego.blablaWorker), both childs of the ThreadGroup "ASF Session Pool Threads". =================================== "Thread-47" has the following trace: loadClass() at line 84 of org.jboss.mx.loading.HeirarchicalLoaderRepository2, this=org.jboss.mx.loading.HeirarchicalLoaderRepository2@129c ... loadClass() at line 262 of java.lang.ClassLoader, this=org.jboss.mx.loading.UnifiedClassLoader@1299 ... =================================== "Thread Pool Worker-0" has the following trace: loadClass() at line 295 of java.lang.ClassLoader, this=org.jboss.mx.loading.UnifiedClassLoader@1299 ... loadClass() at line 88 of org.jboss.mx.loading.HeirarchicalLoaderRepository2, this=org.jboss.mx.loading.HeirarchicalLoaderRepository2@129c ... =================================== ...so the deadlock seems evident. ---------------------------------------------------------------------- You can respond by visiting: https://sourceforge.net/tracker/?func=detail&atid=376685&aid=617574&group_id=22866 ------------------------------------------------------- This sf.net email is sponsored by:ThinkGeek Welcome to geek heaven. http://thinkgeek.com/sf _______________________________________________ Jboss-development mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/jboss-development
