InstantiationException during TreeCacheAop.findObjects()

[motormind]

I get an java.lang.InstantiationException when I try to obtain POJOs from a TreeCacheAop through findObjects, like this:

org.jboss.cache.CacheException: failed creating instance of nl.motormind.tasks.ToCCommand; - nested throwable: (java.lang.InstantiationException: nl.motormind.tasks.ToCCommand)
 at org.jboss.cache.aop.TreeCacheAopDelegate._getObject(TreeCacheAopDelegate.java:75)
 at org.jboss.cache.aop.TreeCacheAopDelegate.findChildObjects(TreeCacheAopDelegate.java:376)
 at org.jboss.cache.aop.TreeCacheAopDelegate._findObjects(TreeCacheAopDelegate.java:356)
 at org.jboss.cache.aop.TreeCacheAop._findObjects(TreeCacheAop.java:522)
 at org.jboss.cache.aop.TreeCacheAop.findObjects(TreeCacheAop.java:461)
 at nl.motormind.server.TblServerRmt.getStoredCommands(Unknown Source)
 at nl.motormind.server.TblServerRmt.getCommands(Unknown Source)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
 at sun.rmi.transport.Transport$1.run(Unknown Source)
 at java.security.AccessController.doPrivileged(Native Method)
 at sun.rmi.transport.Transport.serviceCall(Unknown Source)
 at sun.rmi.transport.tcp.TCPTransport.handleMessages(Unknown Source)
 at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(Unknown Source)
 at java.lang.Thread.run(Unknown Source)

The thing is: nl.motormind.tasks.ToCCommand is a concrete class, so this should work ...

[ben.wang]

Hmmn! I don't see anything obvious come to mind. Can you send me a JUnit test case if you can? [e-mail].

-Ben

[motormind]

-Ben

Alas, the code itself is actually pretty secret, so I can't send it to you. I also only get the error when I try to load an object from a persistent cache using the FileCacheLoader

[ben.wang]

ic. And which version this is? If it is not 1.2.4, can you try it out? I have junit test case for FileCacheLoader that is working under TreeCacheAop.

-Ben

[motormind]

ic. And which version this is? If it is not 1.2.4, can you try it out? I have junit test case for FileCacheLoader that is working under TreeCacheAop.

-Ben

Well, it is version 1.2.4 ...

[ben.wang]

ok, so the code is confidential. But can you cook up a mockup example to reproduce the problem?

Or can you check out the source code and run the CacheLoader tests under aop ppackage? I will be interested to see where it fails.

-Ben

[motormind]

ok, so the code is confidential. But can you cook up a mockup example to reproduce the problem?

Or can you check out the source code and run the CacheLoader tests under aop ppackage? I will be interested to see where it fails.

-Ben

I will see what I can do. It is also happening though without reading from the persistent cache ... and I also get a JGroups error along with it:

11/04/05,14:34:58:jgroups-ERROR-PessimisticLockInterceptor: undo operation failedjava.lang.reflect.InvocationTargetException
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.jboss.cache.aop.collection.CollectionInterceptorUtil.invoke(CollectionInterceptorUtil.java:122)
 at org.jboss.cache.aop.collection.CachedMapInterceptor.invoke(CachedMapInterceptor.java:108)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
 at AOPClassProxy$0.get(AOPClassProxy$0.java)
 at nl.motormind.TblServerRmt$TBLTreeCacheListener.nodeModified(TblServerRmt.java:169)
 at org.jboss.cache.TreeCache.notifyNodeModified(TreeCache.java:4519)
 at org.jboss.cache.TreeCache._remove(TreeCache.java:3863)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.jgroups.blocks.MethodCall.invoke(MethodCall.java:286)
 at org.jboss.cache.interceptors.PessimisticLockInterceptor.rollback(PessimisticLockInterceptor.java:336)
 at org.jboss.cache.interceptors.PessimisticLockInterceptor.access$200(PessimisticLockInterceptor.java:31)
 at org.jboss.cache.interceptors.PessimisticLockInterceptor$SynchronizationHandler.afterCompletion(PessimisticLockInterceptor.java:418)
 at org.jboss.cache.interceptors.OrderedSynchronizationHandler.afterCompletion(OrderedSynchronizationHandler.java:80)
 at org.jboss.cache.transaction.DummyTransaction.notifyAfterCompletion(DummyTransaction.java:260)
 at org.jboss.cache.transaction.DummyTransaction.rollback(DummyTransaction.java:88)
 at org.jboss.cache.transaction.DummyBaseTransactionManager.rollback(DummyBaseTransactionManager.java:84)
 at org.jboss.cache.aop.TreeCacheAop.endTransaction(TreeCacheAop.java:486)
 at org.jboss.cache.aop.TreeCacheAop.putObject(TreeCacheAop.java:373)
 at org.jboss.cache.aop.collection.CachedMapImpl.put(CachedMapImpl.java:66)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.jboss.cache.aop.collection.CollectionInterceptorUtil.invoke(CollectionInterceptorUtil.java:122)
 at org.jboss.cache.aop.collection.CachedMapInterceptor.invoke(CachedMapInterceptor.java:108)
 at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:98)
 at AOPClassProxy$0.put(AOPClassProxy$0.java)