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    java.lang.NullPointerException
        at org.enhydra.jdbc.standard.StandardXAConnection.toString(StandardXAConnection.java:751)
        at org.objectweb.jotm.SLog.addResource(SubCoordinator.java:100)
        at org.objectweb.jotm.SubCoordinator.doPrepare(SubCoordinator.java:837)
        at org.objectweb.jotm.SubCoordinator.commit_one_phase(SubCoordinator.java:484)
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