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From "Rick Curtis (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2158) LiteAutoDetach + DetachProxyFields=false can lead to Broker concurrency exceptions
Date Wed, 21 Mar 2012 19:09:42 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2158?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13234884#comment-13234884
] 

Rick Curtis commented on OPENJPA-2158:
--------------------------------------

Committed code fix and new testcase to trunk and 2.2.x.
                
> LiteAutoDetach + DetachProxyFields=false can lead to Broker concurrency exceptions
> ----------------------------------------------------------------------------------
>
>                 Key: OPENJPA-2158
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2158
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: kernel
>    Affects Versions: 2.1.1, 2.2.0, 2.3.0
>            Reporter: Rick Curtis
>             Fix For: 2.3.0, 2.2.1
>
>
> OPENJPA-2014 added support for allowing proxies to stay in place after detach, but these
detached proxy instances still hold a reference to a StateManager that is no longer valid.
> Exception data: <openjpa-2.2.1-SNAPSHOT-r422266:1244808 fatal general error> org.apache.openjpa.persistence.PersistenceException:
Multiple concurrent threads attempted to access a single broker. By default brokers are not
thread safe; if you require and/or intend a broker to be accessed by more than one thread,
set the openjpa.Multithreaded property to true to override the default behavior.
> 	at org.apache.openjpa.kernel.BrokerImpl.endOperation(BrokerImpl.java:1956)
> 	at org.apache.openjpa.kernel.BrokerImpl.isActive(BrokerImpl.java:1904)
> 	at org.apache.openjpa.kernel.DelegatingBroker.isActive(DelegatingBroker.java:476)
> 	at org.apache.openjpa.persistence.EntityManagerImpl.isActive(EntityManagerImpl.java:677)
> 	at org.apache.openjpa.persistence.PersistenceExceptions$2.translate(PersistenceExceptions.java:76)
> 	at org.apache.openjpa.kernel.DelegatingQuery.translate(DelegatingQuery.java:99)
> 	at org.apache.openjpa.kernel.DelegatingQuery.execute(DelegatingQuery.java:544)
> 	at org.apache.openjpa.persistence.QueryImpl.execute(QueryImpl.java:286)
> 	at org.apache.openjpa.persistence.QueryImpl.getResultList(QueryImpl.java:302)

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