Sometimes this exception is observed:

java.lang.NullPointerException
at org.jboss.as.ejb3.suspend.EJBSuspendHandlerService.doneSuspended(EJBSuspendHandlerService.java:303) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.as.ejb3.suspend.EJBSuspendHandlerService.decrementTransactionCount(EJBSuspendHandlerService.java:315) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.as.ejb3.suspend.EJBSuspendHandlerService.afterCompletion(EJBSuspendHandlerService.java:285) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at com.arjuna.ats.internal.jta.resources.arjunacore.SynchronizationImple.afterCompletion(SynchronizationImple.java:96)
at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.afterCompletion(TwoPhaseCoordinator.java:542)
at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:101)
at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:162)
at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1216)
at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:126)
at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:89)
at org.wildfly.transaction.client.LocalTransaction.commitAndDissociate(LocalTransaction.java:69) [wildfly-transaction-client-1.0.0.Beta17.jar:1.0.0.Beta17]
at org.wildfly.transaction.client.ContextTransactionManager.commit(ContextTransactionManager.java:61) [wildfly-transaction-client-1.0.0.Beta17.jar:1.0.0.Beta17]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.endTransaction(CMTTxInterceptor.java:91) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:279) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.requiresNew(CMTTxInterceptor.java:349) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.as.ejb3.tx.LifecycleCMTTxInterceptor.processInvocation(LifecycleCMTTxInterceptor.java:68) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:240)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41) [wildfly-ejb3-7.1.0.Alpha1-redhat-SNAPSHOT.jar:7.1.0.Alpha1-redhat-SNAPSHOT]