[jboss-dev-forums] [Design the new POJO MicroContainer] - ConcurrentModificationException / Classloading / Deployment

[ALRubinger]

While deploying some MDB Unit Tests today, came across the following error (sporadically):

java.lang.RuntimeException: Failed to download and/or install client side AOP stack

I've also seen other variations, reporting CNFE for at least 3 different classes (I've since thrown away these stack traces).

The underlying cause is, however, consistent when the error is thrown:

Caused by: java.util.ConcurrentModificationException
  |         at java.util.TreeMap$PrivateEntryIterator.nextEntry(TreeMap.java:1031)
  |         at java.util.TreeMap$KeyIterator.next(TreeMap.java:1058)
  |         at org.jboss.mx.loading.LoadMgr3.beginLoadTask(LoadMgr3.java:235)
  |         at org.jboss.mx.loading.UnifiedClassLoader.loadClassImpl(UnifiedClassLoader.java:290)
  |         at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:441)
  |         at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
  |         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
  |         at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.org$jboss$jms$client$delegate$ClientConnectionFactoryDelegate$getClientAOPStack$aop(ClientConnectionFactoryDelegate.java:230)
  |         at org.jboss.jms.client.delegate.ClientConnectionFactoryDelegate.getClientAOPStack(ClientConnectionFactoryDelegate.java)
  |         at org.jboss.jms.client.ClientAOPStackLoader.load(ClientAOPStackLoader.java:75)
  |         at org.jboss.jms.client.JBossConnectionFactory.createConnectionInternal(JBossConnectionFactory.java:192)

I've been duplicating this by running the "ejbthree1123" test a few times, usually I can get it to pop up.  But there's at least a couple threads accessing/writing to one Map instance in there somewhere. :)

S,
ALR

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