Hi,
I have an application that makes heavy use of JMS. One particular queue may have
30,000 messages an hour written to it. I have limited the number of MDBs processing
messages on this queue to 10 and this appears to work OK.
The work done by this MDB in onMessage() always involves a lookup of an EntityBean
using findByPrimaryKey. However I find that 1 in 1000 of the messages consumed will
throw a NullPointerException for the findByPrimaryKey, see the stack trace below.
I am using a Firebird1.0.1 database running on Redhat linux v9. I have configured the
firebird datasource as recommend by the firebird JDBC driver i.e. To deploy the
firebirdsql.rar file, and also to deploy a firebird-ds.xml.
Note:- This JCA-JDBC configuration is currently configured to support XA semantics.
The application only needs XA support for 1 tiny part of the application and I am
going to try changing to use local transactions instead and see if that makes any
difference.
What puzzles me if why problem only occurs under load.
Has anyone every seen a similar issue? as I'm running out of ideas apart from loosing
the entity beans.
So to summize I have 10 MDBs all concurrently processing messages from a queue. Each
of these MDBs will attempt to find the same entity bean and update a progress counter.
However 1 in 1000 messages processed with throw a NPE as shown below.
regards,
Jeff.
STACK TRACE BEGIN[###################
javax.ejb.FinderException: Find failed: java.lang.NullPointerException
at
org.jboss.ejb.plugins.cmp.jdbc.JDBCAbstractQueryCommand.execute(JDBCAbstractQueryCommand.java:238)
at
org.jboss.ejb.plugins.cmp.jdbc.JDBCAbstractQueryCommand.execute(JDBCAbstractQueryCommand.java:111)
at
org.jboss.ejb.plugins.cmp.jdbc.JDBCFindByPrimaryKeyQuery.execute(JDBCFindByPrimaryKeyQuery.java:108)
at
org.jboss.ejb.plugins.cmp.jdbc.JDBCFindEntityCommand.execute(JDBCFindEntityCommand.java:49)
at
org.jboss.ejb.plugins.cmp.jdbc.JDBCStoreManager.findEntity(JDBCStoreManager.java:571)
at
org.jboss.ejb.plugins.CMPPersistenceManager.findEntity(CMPPersistenceManager.java:299)
at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.findEntity(CachedConnectionInterceptor.java:300)
at org.jboss.ejb.EntityContainer.findLocal(EntityContainer.java:637)
at sun.reflect.GeneratedMethodAccessor379.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at
org.jboss.ejb.EntityContainer$ContainerInterceptor.invokeHome(EntityContainer.java:1043)
at
org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:88)
at
org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:88)
at
org.jboss.ejb.plugins.EntitySynchronizationInterceptor.invokeHome(EntitySynchronizationInterceptor.java:197)
at
org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invokeHome(CachedConnectionInterceptor.java:214)
at
org.jboss.ejb.plugins.AbstractInterceptor.invokeHome(AbstractInterceptor.java:88)
at
org.jboss.ejb.plugins.EntityInstanceInterceptor.invokeHome(EntityInstanceInterceptor.java:89)
at
org.jboss.ejb.plugins.EntityLockInterceptor.invokeHome(EntityLockInterceptor.java:61)
at
org.jboss.ejb.plugins.EntityCreationInterceptor.invokeHome(EntityCreationInterceptor.java:28)
at
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:88)
at
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:267)
at org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:98)
at
org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:92)
at org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:120)
at
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:93)
at org.jboss.ejb.EntityContainer.internalInvokeHome(EntityContainer.java:483)
at org.jboss.ejb.Container.invoke(Container.java:720)
at
org.jboss.ejb.plugins.local.BaseLocalProxyFactory.invokeHome(BaseLocalProxyFactory.java:293)
at org.jboss.ejb.plugins.local.LocalHomeProxy.invoke(LocalHomeProxy.java:110)
at $Proxy126.findByPrimaryKey(Unknown Source)
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