You cannot commit during a managed transaction!

There can be some problem as commit failed during execution of a hibernate operation. It can be avoided by modifying cfg file for accommodating JPA operations in JBoss. Solution is listed below the following error.

19:30:43,113 ERROR [JDBCTransaction] JDBC commit failed
java.sql.SQLException: You cannot commit during a managed transaction!
        at org.jboss.resource.adapter.jdbc.BaseWrapperManagedConnection.jdbcCommit(BaseWrapperManagedConnection.java:659)
        at org.jboss.resource.adapter.jdbc.WrappedConnection.commit(WrappedConnection.java:486)
        at org.hibernate.transaction.JDBCTransaction.commitAndResetAutoCommit(JDBCTransaction.java:170)
        at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:146)
        …

        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeTarget(MethodInvocation.java:122)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:111)
        at org.jboss.ejb3.EJBContainerInvocationWrapper.invokeNext(EJBContainerInvocationWrapper.java:69)
        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.invoke(InterceptorSequencer.java:73)
        at org.jboss.ejb3.interceptors.aop.InterceptorSequencer.aroundInvoke(InterceptorSequencer.java:59)
        at sun.reflect.GeneratedMethodAccessor350.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.jboss.aop.advice.PerJoinpointAdvice.invoke(PerJoinpointAdvice.java:174)
        at org.jboss.aop.joinpoint.MethodInvocation.invokeNext(MethodInvocation.java:102)
        at org.jboss.ejb3.interceptors.aop.InvocationContextInterceptor.fillMethod(InvocationContextInterceptor.java:72)
        …

Update your abc.cfg.xml file and add following lines after

<property name="hibernate.transaction.factory_class">org.hibernate.transaction.JTATransactionFactory</property>
<property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.JBossTransactionManagerLookup</property>

Now if your problem is fixed, just smile and take a break. I know you might have already been working quite hard for quite long time