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From "Niklas Mehner (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1346) ClassNotFoundException in org.apache.openjpa.datacache.Caches.addTypesByName
Date Tue, 13 Oct 2009 07:55:31 GMT
ClassNotFoundException in org.apache.openjpa.datacache.Caches.addTypesByName
----------------------------------------------------------------------------

                 Key: OPENJPA-1346
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1346
             Project: OpenJPA
          Issue Type: Question
          Components: datacache
    Affects Versions: 1.1.0
         Environment: Windows / Oracle Weblogic 10.3.1 (JPA Version: <Starting OpenJPA
1.1.1-SNAPSHOT>)
            Reporter: Niklas Mehner


This seems to be the same problem as OPENJPA-1093 (only openjpa, not kodo)

We are getting the following exception in our logfile:

5484  lvs-ejb3  WARN   [[ACTIVE] ExecuteThread: '12' for queue: 'weblogic.kernel.Default (self-tuning)']
openjpa.Runtime - null
java.lang.ClassNotFoundException: de.evelopment.retail.lvs.ejb.stammdaten.BoxBean
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Class.java:247)
        at org.apache.openjpa.datacache.Caches.addTypesByName(Caches.java:48)
        at org.apache.openjpa.datacache.AbstractQueryCache.afterCommit(AbstractQueryCache.java:198)
        at org.apache.openjpa.event.RemoteCommitEventManager.fireEvent(RemoteCommitEventManager.java:132)
        at org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager.fireEvent(AbstractConcurrentEventManager.java:115)
        at org.apache.openjpa.event.AbstractRemoteCommitProvider.fireEvent(AbstractRemoteCommitProvider.java:63)
        at org.apache.openjpa.event.SingleJVMRemoteCommitProvider.broadcast(SingleJVMRemoteCommitProvider.java:58)
        at org.apache.openjpa.event.RemoteCommitEventManager.afterCommit(RemoteCommitEventManager.java:156)
        at org.apache.openjpa.event.TransactionEventManager.fireEvent(TransactionEventManager.java:107)
        at org.apache.openjpa.lib.util.concurrent.AbstractConcurrentEventManager.fireEvent(AbstractConcurrentEventManager.java:115)
        at org.apache.openjpa.kernel.BrokerImpl.fireTransactionEvent(BrokerImpl.java:757)
        at org.apache.openjpa.kernel.BrokerImpl.endTransaction(BrokerImpl.java:2200)
        at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java:1846)
        at weblogic.transaction.internal.ServerSCInfo.doAfterCompletion(ServerSCInfo.java:1038)
        at weblogic.transaction.internal.ServerSCInfo.callAfterCompletions(ServerSCInfo.java:1014)
        at weblogic.transaction.internal.ServerTransactionImpl.callAfterCompletions(ServerTransactionImpl.java:2998)
        at weblogic.transaction.internal.ServerTransactionImpl.afterCommittedStateHousekeeping(ServerTransactionImpl.java:2898)
        at weblogic.transaction.internal.ServerTransactionImpl.setCommitted(ServerTransactionImpl.java:2943)
        at weblogic.transaction.internal.ServerTransactionImpl.globalRetryCommit(ServerTransactionImpl.java:2733)
        at weblogic.transaction.internal.ServerTransactionImpl.globalCommit(ServerTransactionImpl.java:2653)
        at weblogic.transaction.internal.ServerTransactionImpl.internalCommit(ServerTransactionImpl.java:285)
        at weblogic.transaction.internal.ServerTransactionImpl.commit(ServerTransactionImpl.java:233)
        at weblogic.ejb.container.internal.BaseRemoteObject.postInvoke1(BaseRemoteObject.java:621)
        at weblogic.ejb.container.internal.StatelessRemoteObject.postInvoke1(StatelessRemoteObject.java:60)
        at weblogic.ejb.container.internal.BaseRemoteObject.postInvokeTxRetry(BaseRemoteObject.java:441)

where de.evelopment.retail.lvs.ejb.stammdaten.BoxBean is an entity bean. 

I think the problem is that openjpa uses Class.forName(..) instead of Thread.currentThread().getContextClassLoader().loadClass(...)
to load the class.
openJPA is loaded by the system classloader, while the class is from the ear-classloader,
so Class.forName(..) cannot work.

the properties used in persistence.xml are:

  <properties>
     	<property name="openjpa.DetachState" value="fetch-groups(DetachedStateField=true)"/>
     	<property name="openjpa.DataCache" value="true"/>
        <property name="openjpa.RemoteCommitProvider" value="sjvm"/>     	
     </properties>

Can we ignore this problem or can this cause real problems (I do not care all that much if
caching is not working for this class, but I don't want any data corruption)?


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