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https://issues.apache.org/jira/browse/OPENJPA-261?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12506401
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Patrick Linskey commented on OPENJPA-261:
-----------------------------------------
Update from Teresa's email:
Sorry it was not NPE, it was UnsupportedOperationException. I had the NPE
before and somehow mixed up with two. Anyway, it caused by :
java.lang.UnsupportedOperationException: IteratorChains must contain at
least one Iterator
The Collecitons.EMPTY_LIST.iterator() does not return null.
Here is the exception stack:
4781 emptest TRACE [main] openjpa.Runtime - An exception occurred while
ending the transaction. This exception will be re-thrown.
<0.0.0 nonfatal user error> org.apache.openjpa.util.NoTransactionException:
Can only perform operation while a transaction is active.
at org.apache.openjpa.kernel.BrokerImpl.assertActiveTransaction(
BrokerImpl.java:4307)
at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java
:1806)
at org.apache.openjpa.kernel.LocalManagedRuntime.rollback(
LocalManagedRuntime.java:123)
at org.apache.openjpa.kernel.LocalManagedRuntime.commit(
LocalManagedRuntime.java:104)
at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1319)
at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java
:869)
at org.apache.openjpa.persistence.EntityManagerImpl.commit(
EntityManagerImpl.java:409)
at tutorial.ejb.TestEmpsPerClass.main(TestEmpsPerClass.java:135)
4781 emptest TRACE [main] openjpa.Runtime - An exception occurred while
ending the transaction. This exception will be re-thrown.
<0.0.0 nonfatal store error> org.apache.openjpa.util.StoreException:
IteratorChains must contain at least one Iterator
at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java
:1833)
at org.apache.openjpa.kernel.LocalManagedRuntime.commit(
LocalManagedRuntime.java:93)
at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1319)
at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java
:869)
at org.apache.openjpa.persistence.EntityManagerImpl.commit(
EntityManagerImpl.java:409)
at tutorial.ejb.TestEmpsPerClass.main(TestEmpsPerClass.java:135)
Caused by: java.lang.UnsupportedOperationException: IteratorChains must
contain at least one Iterator
at
org.apache.commons.collections.iterators.IteratorChain.checkChainIntegrity(Unknown
Source)
at org.apache.commons.collections.iterators.IteratorChain.lockChain(Unknown
Source)
at org.apache.commons.collections.iterators.IteratorChain.hasNext(Unknown
Source)
at org.apache.openjpa.kernel.BrokerImpl.endTransaction(BrokerImpl.java:2196)
at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java
:1809)
... 5 more
<0.0.0 fatal store error> org.apache.openjpa.persistence.RollbackException:
IteratorChains must contain at least one Iterator
at org.apache.openjpa.persistence.EntityManagerImpl.commit(
EntityManagerImpl.java:420)
at tutorial.ejb.TestEmpsPerClass.main(TestEmpsPerClass.java:135)
Caused by: <0.0.0 nonfatal general error>
org.apache.openjpa.persistence.PersistenceException: IteratorChains must
contain at least one Iterator
at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java
:1833)
at org.apache.openjpa.kernel.LocalManagedRuntime.commit(
LocalManagedRuntime.java:93)
at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1319)
at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java
:869)
at org.apache.openjpa.persistence.EntityManagerImpl.commit(
EntityManagerImpl.java:409)
... 1 more
Caused by: java.lang.UnsupportedOperationException: IteratorChains must
contain at least one Iterator
at
org.apache.commons.collections.iterators.IteratorChain.checkChainIntegrity(Unknown
Source)
at org.apache.commons.collections.iterators.IteratorChain.lockChain(Unknown
Source)
at org.apache.commons.collections.iterators.IteratorChain.hasNext(Unknown
Source)update different fields
at org.apache.openjpa.kernel.BrokerImpl.endTransaction(BrokerImpl.java:2196)
at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java
:1809)
... 5 more
> UnsupportedOperationException occurred in BrokerImpl.java
> ---------------------------------------------------------
>
> Key: OPENJPA-261
> URL: https://issues.apache.org/jira/browse/OPENJPA-261
> Project: OpenJPA
> Issue Type: Bug
> Components: kernel
> Affects Versions: 0.9.7
> Environment: Window XP
> Reporter: Teresa Kan
> Priority: Critical
> Attachments: NPE.patch
>
>
> While I was testing against the openjpa code, I got an
> UnsupportedOperationException in the BrokerImpl.endtransaction() method. The
> method set the transState to an empty Collection if there is no cache for
> transactions. Later the code got an UnsupportedOperationException.
> Original code:
> Collection transStates = _transCache;
> if (transStates == null)
> transStates = Collections.EMPTY_LIST;
> .....
> for (Iterator itr = transStates.iterator(); itr.hasNext();) {
> sm = (StateManagerImpl) itr.next();
> try {
> if (rollback) {
> // tell objects that may have been derefed then flushed
> // (and therefore deleted) to un-deref
> sm.setDereferencedDependent(false, false);
> sm.rollback();
> } else
> sm.commit();
> } catch (RuntimeException re) {
> exceps = add(exceps, re);
> }
> }
> I put a check before this "for" loop then the UnsupportedOperationException
> disappeared.
> if (!transStates.isEmpty()) {
> for (Iterator itr = transStates.iterator(); itr.hasNext();) {
> sm = (StateManagerImpl) itr.next();
> try {
> if (rollback) {
> // tell objects that may have been derefed then flushed
> // (and therefore deleted) to un-deref
> sm.setDereferencedDependent(false, false);
> sm.rollback();
> } else
> sm.commit();
> } catch (RuntimeException re) {
> exceps = add(exceps, re);
> }
> }
> }
> The NPE.patch is attached to this JIRA.
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