Hi,

I embed jbpm (6.1.0) in a webapp built on spring framework (3.1.2), and it run well for most of the time.

However, I receive "BitronixXAException" from time to time, and I have to restart my tomcat instance whenever it occurs.

Following is the final part of exception stack trace:

Caused by: java.sql.SQLException: error enlisting a JdbcConnectionHandle of a JdbcPooledConnection from datasource jdbc/testDS in state ACCESSIBLE with usage count 1 wrapping a JDBC LrcXAConnection on com.mysql.jdbc.JDBC4Connection@44518021 on a JDBC LrcConnectionHandle on a JDBC LrcXAResource in state NO_TX

        at bitronix.tm.resource.jdbc.JdbcConnectionHandle.enlistResource(JdbcConnectionHandle.java:87)

        at bitronix.tm.resource.jdbc.JdbcConnectionHandle.prepareStatement(JdbcConnectionHandle.java:265)

        at sun.reflect.GeneratedMethodAccessor61.invoke(Unknown Source)

        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)

        at java.lang.reflect.Method.invoke(Method.java:498)

        at bitronix.tm.resource.jdbc.BaseProxyHandlerClass.invoke(BaseProxyHandlerClass.java:64)

        at com.sun.proxy.$Proxy18.prepareStatement(Unknown Source)

        at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$2.doPrepare(StatementPreparerImpl.java:117)

        at org.hibernate.engine.jdbc.internal.StatementPreparerImpl$StatementPreparationTemplate.prepareStatement(StatementPreparerImpl.java:183)

        ... 92 more

Caused by: bitronix.tm.internal.BitronixSystemException: cannot enlist an XAResourceHolderState with uniqueName=jdbc/testDS XAResource=a JDBC LrcXAResource in state NO_TX with XID a Bitronix XID [31302E3230302E31302E323239000000000BEECC4C00000134 : 31302E3230302E31302E323239000000000BEECC4C00000135], error=XAER_PROTO

        at bitronix.tm.BitronixTransaction.enlistResource(BitronixTransaction.java:139)

        at bitronix.tm.resource.common.TransactionContextHelper.enlistInCurrentTransaction(TransactionContextHelper.java:69)

        at bitronix.tm.resource.jdbc.JdbcConnectionHandle.enlistResource(JdbcConnectionHandle.java:85)

        ... 100 more

Caused by: bitronix.tm.internal.BitronixXAException: resource already started on XID a Bitronix XID [31302E3230302E31302E323239000000000AEB6B3900000122 : 31302E3230302E31302E323239000000000AEB6B3900000123]

        at bitronix.tm.resource.jdbc.lrc.LrcXAResource.start(LrcXAResource.java:123)

        at bitronix.tm.internal.XAResourceHolderState.start(XAResourceHolderState.java:220)

        at bitronix.tm.internal.XAResourceManager.enlist(XAResourceManager.java:111)

        at bitronix.tm.BitronixTransaction.enlistResource(BitronixTransaction.java:130)

        ... 102 more

I found a discussion on similar issue back in 2011:

Bitronix Transaction Manager - Getting "bitronix.tm.internal.BitronixXAException: resource already started on XID" error

"

I think after some investigation I'm

leaning toward this being an application issue and not something

inherently wrong in Bitronix.  I wrote a simple little test and verified

that this error happens whenever a javax.sql.Connection gets reused

across multiple concurrent transactions in different threads.  So I

think there is probably something going wrong "above" the tm/pooling layer.

"

Unfortunately, this discussion is yet unsolved.

I wonder what may cause this exception and how can I avoid or workaround it?

Thank you for your time.