[jboss-remoting-issues] [JBoss JIRA] Commented: (JBREM-552) cannot init cause of ClassCastException

[Jens Mueller (JIRA)]

    [ https://issues.jboss.org/browse/JBREM-552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12618466#comment-12618466 ] 

Jens Mueller commented on JBREM-552:
------------------------------------

A very similar issue happens reproducibly in JBoss 4.2.3.GA when first after deployment inserting an element in a Google Guava Map created with new MapMaker().softValues().maximumSize(cacheSize).makeMap():

java.lang.IllegalStateException: Can't overwrite cause
  at java.lang.Throwable.initCause(Throwable.java:320)
  at org.jboss.mx.loading.RepositoryClassLoader.findClass(RepositoryClassLoader.java:624)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
  at org.jboss.mx.loading.RepositoryClassLoader.loadClassImpl(RepositoryClassLoader.java:474)
  at org.jboss.mx.loading.RepositoryClassLoader.loadClass(RepositoryClassLoader.java:415)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
  at com.google.common.collect.CustomConcurrentHashMap$2.iterator(CustomConcurrentHashMap.java:828)
  at java.util.AbstractCollection.remove(AbstractCollection.java:241)
  at com.google.common.collect.CustomConcurrentHashMap$Segment.removeFromChain(CustomConcurrentHashMap.java:2599)
  at com.google.common.collect.CustomConcurrentHashMap$Segment.processPendingCleanup(CustomConcurrentHashMap.java:2772)
  at com.google.common.collect.CustomConcurrentHashMap$Segment.runLockedCleanup(CustomConcurrentHashMap.java:2860)
  at com.google.common.collect.CustomConcurrentHashMap$Segment.preWriteCleanup(CustomConcurrentHashMap.java:2806)
  at com.google.common.collect.CustomConcurrentHashMap$Segment.put(CustomConcurrentHashMap.java:2374)
  at com.google.common.collect.CustomConcurrentHashMap.put(CustomConcurrentHashMap.java:3346)
  at my.app.cache.CacheImplGoogleGuava.put(CacheImplGoogleGuava.java:36)
...


Debugging in Throwable.initCause showed the original exception being a "ClassNotFoundException: Invalid use of destroyed classloader for com.google.common.collect.Iterators, UCL destroyed at:" with stacktrace:

ClassNotFoundException(Throwable).initCause(Throwable):320
UnifiedClassLoader3(RepositoryClassLoader).findClass(String):628
...
UnifiedClassLoader3(ClassLoader).loadClass(String):248
CustomConcurrentHashMap$2.iterator():828
CustomConcurrentHashMap$2(AbstractCollection<E>).remove(Object):241
CustomConcurrentHashMap$Segment.enqueueCleanup(...):2738
CustomConcurrentHashMap$Segment.unsetValue(...):2662
CustomConcurrentHashMap<K, V>.reclaimValue(...)
CustomConcurrentHashMap$SoftValueReference<K, V>.finalizeReferent():1637
...
Method.invoke:574
Finalizer.claenUp:154 
Finalizer.run:127



> cannot init cause of ClassCastException
> ---------------------------------------
>
>                 Key: JBREM-552
>                 URL: https://issues.jboss.org/browse/JBREM-552
>             Project: JBoss Remoting
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>    Affects Versions: 2.0.0.Beta2 (Boon)
>            Reporter: John Mazzitelli
>            Assignee: Tom Elrod
>            Priority: Minor
>             Fix For: 2.0.0.CR1 (Boon)
>
>
> I'm in a catch clause within InvokerRegistry and I'm getting a weird exception thrown:
> java.lang.IllegalStateException: Can't overwrite cause
> 	at java.lang.Throwable.initCause(Throwable.java:320)
> 	at org.jboss.remoting.InvokerRegistry.loadClientInvoker(InvokerRegistry.java:447)
> 	at org.jboss.remoting.InvokerRegistry.createClientInvoker(InvokerRegistry.java:324)
> 	at org.jboss.remoting.Client.connect(Client.java:385)
> 	at org.jboss.on.communications.command.client.JBossRemotingRemoteCommunicator.getRemotingClient(JBossRemotingRemoteCommunicator.java:470)
> 	at org.jboss.on.communications.command.client.JBossRemotingRemoteCommunicator.send(JBossRemotingRemoteCommunicator.java:430)
> 	at org.jboss.on.communications.command.client.AbstractCommandClient.invoke(AbstractCommandClient.java:167)
> 	at org.jboss.on.communications.command.client.ClientCommandSender.send(ClientCommandSender.java:820)
> 	at org.jboss.on.communications.command.client.ServerPollingThread.run(ServerPollingThread.java:102)
> Look at line 447 and you'll see it is trying to init the cause of a ClassNotFoundException.  Running in a debugger, the newly constructed exception created on 446 has a null cause.  Looking then at Throwable.initCause and you'll see a null cause causes this IllegalStateException to be thrown.  The cause needs to be "this", not null (I don't know why, seems like it should also look for null, but whatever - that's the way the JDK is written).
> The fix is simple - use the constructor that takes a throwable as its second parameter.  Not sure why initCause it being used, as opposed to this constructor.
> e.g.:
> new ClassNotFoundException("Can not invoke loadClientInvokerClass method on " + transportFactoryClass, e);
> (notice the ", e" parameter).
> There are three other instances where initCause is called on ClassNotFoundException that also need to be fixed.  See the other catch clauses in here.

--
This message is automatically generated by JIRA.
For more information on JIRA, see: http://www.atlassian.com/software/jira