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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2193) Nullpointer exception when persisting object during high load
Date Wed, 11 Jul 2012 15:02:35 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2193?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13411605#comment-13411605
] 

Rick Curtis commented on OPENJPA-2193:
--------------------------------------

I did some digging this morning and I'm getting the feeling that this doesn't have anything
to do with tomcat connections going stale.... In my JSE testing, the callflow for committing
a transaction which has no connection is something like this :

em.getTransaction.commit() -> BrokerImpl.commit() -> LocalManagedRuntime.commit() ->
BrokerImpl.beforeCompletion() -> .... BrokerImpl.flush() ... -> BrokerImpl.beginStoreManagerConnection()
-> JDBCStoreManager.retainConnection() -> ... [eventually gets a connection] -> 

Can you do some debugging to see why we aren't getting a connection when going down the transaction
commit path? Perhaps a before/after completion call isn't happening? Also, could you post
your entire persistence.xml file?

Thanks,
Rick
                
> Nullpointer exception when persisting object during high load
> -------------------------------------------------------------
>
>                 Key: OPENJPA-2193
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2193
>             Project: OpenJPA
>          Issue Type: Bug
>            Reporter: Daniel Persson
>            Priority: Minor
>         Attachments: patch-tomcat-pooling-fix.patch
>
>
> During high load and many persists _conn is null during commit.
> Caused by: <openjpa-2.2.0-r422266:1244990 nonfatal general error> org.apache.openjpa.persistence.PersistenceException:
null
>         at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java:2034)
>         at org.apache.openjpa.kernel.LocalManagedRuntime.commit(LocalManagedRuntime.java:94)
>         at org.apache.openjpa.kernel.BrokerImpl.commit(BrokerImpl.java:1514)
>         at org.apache.openjpa.kernel.DelegatingBroker.commit(DelegatingBroker.java:933)
>         at org.apache.openjpa.persistence.EntityManagerImpl.commit(EntityManagerImpl.java:570)
>         ... 29 more
> Caused by: java.lang.NullPointerException
>         at org.apache.openjpa.jdbc.kernel.JDBCStoreManager.commit(JDBCStoreManager.java:196)
>         at org.apache.openjpa.kernel.DelegatingStoreManager.commit(DelegatingStoreManager.java:95)
>         at org.apache.openjpa.datacache.DataCacheStoreManager.commit(DataCacheStoreManager.java:88)
>         at org.apache.openjpa.kernel.DelegatingStoreManager.commit(DelegatingStoreManager.java:95)
>         at org.apache.openjpa.kernel.BrokerImpl.endStoreManagerTransaction(BrokerImpl.java:1471)
>         at org.apache.openjpa.kernel.BrokerImpl.endTransaction(BrokerImpl.java:2351)
>         at org.apache.openjpa.kernel.BrokerImpl.afterCompletion(BrokerImpl.java:2010)
>         ... 33 more

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