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From Todd Nine <t...@spidertracks.com>
Subject Concurrent modification exception on recursive load
Date Thu, 24 Mar 2011 05:00:57 GMT
Hey guys,
  I have all my plugin tests passing except for one.  I'm not sure if
it's a bug in OpenJPA or in my code.  When I'm recursively fetching
entities, I will occasionally get this error.

<openjpa-2.1.0-r422266:1071316 nonfatal general error>
org.apache.openjpa.util.GeneralException: null
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:1003)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:897)
	at
com.datastax.hectorjpa.meta.ToOneColumn.readField(ToOneColumn.java:127)
	at
com.datastax.hectorjpa.store.EntityFacade.loadColumns(EntityFacade.java:237)
	at
com.datastax.hectorjpa.store.CassandraStore.getObject(CassandraStore.java:97)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.load(CassandraStoreManager.java:160)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:117)
	at
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3061)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3135)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1738)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1628)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:915)
	at
org.apache.openjpa.kernel.ManagedCache.dirtyCheck(ManagedCache.java:302)
	at
org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:4029)
	at
org.apache.openjpa.kernel.BrokerImpl.addToTransaction(BrokerImpl.java:4101)
	at
org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:274)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:381)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:333)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.initialize(CassandraStoreManager.java:143)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
	at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
	at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1022)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:980)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:897)
	at
com.datastax.hectorjpa.meta.ToOneColumn.readField(ToOneColumn.java:127)
	at
com.datastax.hectorjpa.store.EntityFacade.loadColumns(EntityFacade.java:237)
	at
com.datastax.hectorjpa.store.CassandraStore.getObject(CassandraStore.java:97)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.load(CassandraStoreManager.java:160)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:117)
	at
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3061)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3135)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1738)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1628)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:915)
	at
org.apache.openjpa.kernel.ManagedCache.dirtyCheck(ManagedCache.java:302)
	at
org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:4029)
	at
org.apache.openjpa.kernel.BrokerImpl.addToTransaction(BrokerImpl.java:4101)
	at
org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:274)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:381)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:333)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.initialize(CassandraStoreManager.java:143)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
	at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
	at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1022)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:980)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:897)
	at
com.datastax.hectorjpa.meta.ToOneColumn.readField(ToOneColumn.java:127)
	at
com.datastax.hectorjpa.store.EntityFacade.loadColumns(EntityFacade.java:237)
	at
com.datastax.hectorjpa.store.CassandraStore.getObject(CassandraStore.java:97)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.load(CassandraStoreManager.java:160)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:117)
	at
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3061)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3135)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1738)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1628)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:915)
	at
org.apache.openjpa.kernel.ManagedCache.dirtyCheck(ManagedCache.java:302)
	at
org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:4029)
	at org.apache.openjpa.kernel.BrokerImpl.setDirty(BrokerImpl.java:4146)
	at
org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:278)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1701)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirty(StateManagerImpl.java:1628)
	at
org.apache.openjpa.kernel.StateManagerImpl.dirtyCheck(StateManagerImpl.java:915)
	at
org.apache.openjpa.kernel.ManagedCache.dirtyCheck(ManagedCache.java:302)
	at
org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:4029)
	at
org.apache.openjpa.kernel.BrokerImpl.addToTransaction(BrokerImpl.java:4101)
	at
org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:274)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:381)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:333)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.initialize(CassandraStoreManager.java:143)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
	at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
	at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1022)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:980)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:897)
	at
com.datastax.hectorjpa.meta.ToOneColumn.readField(ToOneColumn.java:127)
	at
com.datastax.hectorjpa.store.EntityFacade.loadColumns(EntityFacade.java:237)
	at
com.datastax.hectorjpa.store.CassandraStore.getObject(CassandraStore.java:97)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.initialize(CassandraStoreManager.java:145)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
	at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
	at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1022)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:980)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:897)
	at
com.datastax.hectorjpa.meta.collection.OrderedCollectionField.readField(OrderedCollectionField.java:123)
	at
com.datastax.hectorjpa.store.EntityFacade.loadColumns(EntityFacade.java:213)
	at
com.datastax.hectorjpa.store.CassandraStore.getObject(CassandraStore.java:97)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.load(CassandraStoreManager.java:160)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.load(DelegatingStoreManager.java:117)
	at
org.apache.openjpa.kernel.ROPStoreManager.load(ROPStoreManager.java:78)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadFields(StateManagerImpl.java:3061)
	at
org.apache.openjpa.kernel.StateManagerImpl.loadField(StateManagerImpl.java:3135)
	at
org.apache.openjpa.kernel.StateManagerImpl.fetchObjectField(StateManagerImpl.java:2383)
	at
org.apache.openjpa.kernel.StateManagerImpl.fetchField(StateManagerImpl.java:865)
	at
org.apache.openjpa.kernel.StateManagerImpl.fetch(StateManagerImpl.java:827)
	at org.apache.openjpa.enhance.RedefinitionHelper
$1.invoke(RedefinitionHelper.java:230)
	at $Proxy20.get(Unknown Source)
	at
com.datastax.hectorjpa.store.ManyToOneIndexTest.basicFollowingDelete(ManyToOneIndexTest.java:203)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.junit.runners.model.FrameworkMethod
$1.runReflectiveCall(FrameworkMethod.java:44)
	at
org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
	at
org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
	at
org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
	at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
	at
org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
	at
org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:28)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
	at
org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
	at
org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
	at
org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
Caused by: java.util.ConcurrentModificationException
	at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
	at java.util.HashMap$KeyIterator.next(HashMap.java:828)
	at
org.apache.openjpa.kernel.ManagedCache.dirtyCheck(ManagedCache.java:301)
	at
org.apache.openjpa.kernel.BrokerImpl.hasTransactionalObjects(BrokerImpl.java:4029)
	at
org.apache.openjpa.kernel.BrokerImpl.addToTransaction(BrokerImpl.java:4101)
	at
org.apache.openjpa.kernel.StateManagerImpl.setPCState(StateManagerImpl.java:274)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:381)
	at
org.apache.openjpa.kernel.StateManagerImpl.initialize(StateManagerImpl.java:333)
	at
com.datastax.hectorjpa.store.CassandraStoreManager.initialize(CassandraStoreManager.java:143)
	at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingStoreManager.java:112)
	at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.java:57)
	at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:1022)
	at org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:980)
	... 123 more



I don't get it when running in debug mode, so I think it's some sort of
race condition.  Any ideas what I'm doing wrong in my code?  Also, with
collection proxies created using OpenJPAStateManager.newProxyField(int
id), I'll occasionally have fields that have been removed from the
collection, but aren't returned via the change tracker's getRemoved().
Is this a know issue?

Thanks,
Todd
-- 
todd 
SENIOR SOFTWARE ENGINEER

todd nine| spidertracks ltd |  117a the square 
po box 5203 | palmerston north 4441 | new zealand 
P: +64 6 353 3395
E: todd@spidertracks.co.nz W: www.spidertracks.com 







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