Some concerns are imposed on the KieServerMDB.java [1] that it retains connection retrieved from Managed Connection Pool(MCP) which is unnecessary. It could cause some issues in the subsequent jbpm engine call in the onMessage method.

We've discovered one NullPointerException in a use case where a tibco resource adapter is configured in EAP 7 with bpms 6.4:

2017-08-18 12:26:07,042 ERROR [stderr] (default-threads - 5) java.lang.NullPointerException
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.tx.jbossts.XAResourceWrapperImpl.setTransactionTimeout(XAResourceWrapperImpl.java:204)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.enlistResource(TransactionImple.java:637)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.enlistResource(TransactionImple.java:423)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.connectionmanager.listener.TxConnectionListener$TransactionSynchronization.enlist(TxConnectionListener.java:986)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.connectionmanager.listener.TxConnectionListener.enlist(TxConnectionListener.java:379)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.connectionmanager.tx.TxConnectionManagerImpl.transactionStarted(TxConnectionManagerImpl.java:449)
2017-08-18 12:26:07,043 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.connectionmanager.ccm.CachedConnectionManagerImpl.userTransactionStarted(CachedConnectionManagerImpl.java:249)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.jboss.jca.core.tx.jbossts.UserTransactionListenerImpl.userTransactionStarted(UserTransactionListenerImpl.java:52)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.jboss.tm.usertx.UserTransactionRegistry.userTransactionStarted(UserTransactionRegistry.java:119)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.jboss.tm.usertx.client.ServerVMClientUserTransaction.begin(ServerVMClientUserTransaction.java:171)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.drools.persistence.jta.JtaTransactionManager.begin(JtaTransactionManager.java:205)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.drools.persistence.SingleSessionCommandService.<init>(SingleSessionCommandService.java:106)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.buildCommandService(KnowledgeStoreServiceImpl.java:171)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:70)
2017-08-18 12:26:07,044 ERROR [stderr] (default-threads - 5) at org.drools.persistence.jpa.KnowledgeStoreServiceImpl.newKieSession(KnowledgeStoreServiceImpl.java:39)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.kie.internal.persistence.jpa.JPAKnowledgeService.newStatefulKnowledgeSession(JPAKnowledgeService.java:121)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.jbpm.runtime.manager.impl.factory.JPASessionFactory.newKieSession(JPASessionFactory.java:42)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.jbpm.runtime.manager.impl.PerProcessInstanceRuntimeManager$PerProcessInstanceInitializer.initKieSession(PerProcessInstanceRuntimeManager.java:542)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.jbpm.runtime.manager.impl.RuntimeEngineImpl.getKieSession(RuntimeEngineImpl.java:70)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.jbpm.kie.services.impl.ProcessServiceImpl.startProcess(ProcessServiceImpl.java:97)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.kie.server.services.jbpm.ProcessServiceBase.startProcess(ProcessServiceBase.java:86)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at java.lang.reflect.Method.invoke(Method.java:498)
2017-08-18 12:26:07,045 ERROR [stderr] (default-threads - 5) at org.apache.commons.lang3.reflect.MethodUtils.invokeMethod(MethodUtils.java:133)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at org.apache.commons.lang3.reflect.MethodUtils.invokeMethod(MethodUtils.java:94)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at org.kie.server.services.jbpm.JBPMKieContainerCommandServiceImpl.executeScript(JBPMKieContainerCommandServiceImpl.java:137)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at org.kie.server.jms.KieServerMDB.onMessage(KieServerMDB.java:214)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at java.lang.reflect.Method.invoke(Method.java:498)
2017-08-18 12:26:07,046 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:82)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:93)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:63)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.invocationmetrics.ExecutionTimeInterceptor.processInvocation(ExecutionTimeInterceptor.java:43)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.tx.EjbBMTInterceptor.handleInvocation(EjbBMTInterceptor.java:103)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.tx.BMTInterceptor.processInvocation(BMTInterceptor.java:58)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
2017-08-18 12:26:07,047 ERROR [stderr] (default-threads - 5) at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
2017-08-18 12:26:07,048 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.invocationmetrics.WaitTimeInterceptor.processInvocation(WaitTimeInterceptor.java:43)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.deployment.processors.StartupAwaitInterceptor.processInvocation(StartupAwaitInterceptor.java:22)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,049 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.deployment.processors.EjbSuspendInterceptor.processInvocation(EjbSuspendInterceptor.java:53)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.interceptors.LoggingInterceptor.processInvocation(LoggingInterceptor.java:66)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
2017-08-18 12:26:07,050 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.component.messagedriven.MessageDrivenComponentDescription$5$1.processInvocation(MessageDrivenComponentDescription.java:239)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636)
2017-08-18 12:26:07,051 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.ViewService$View.invoke(ViewService.java:198)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.ViewDescription$1.processInvocation(ViewDescription.java:185)
2017-08-18 12:26:07,052 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at org.jboss.as.ee.component.ProxyInvocationHandler.invoke(ProxyInvocationHandler.java:73)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at org.kie.server.jms.KieServerMDB$$$view3.onMessage(Unknown Source)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at java.lang.reflect.Method.invoke(Method.java:498)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.inflow.MessageEndpointInvocationHandler.doInvoke(MessageEndpointInvocationHandler.java:139)
2017-08-18 12:26:07,053 ERROR [stderr] (default-threads - 5) at org.jboss.as.ejb3.inflow.AbstractInvocationHandler.invoke(AbstractInvocationHandler.java:73)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at org.kie.server.jms.KieServerMDB$$$endpoint4.onMessage(Unknown Source)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at org.jboss.resource.adapter.jms.inflow.JmsServerSession.onMessage(JmsServerSession.java:163)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at com.tibco.tibjms.TibjmsxSessionImp._submit(TibjmsxSessionImp.java:4249)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at com.tibco.tibjms.TibjmsxSessionImp._dispatchAsyncMessage(TibjmsxSessionImp.java:2299)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at com.tibco.tibjms.TibjmsxSessionImp._run(TibjmsxSessionImp.java:3706)
2017-08-18 12:26:07,054 ERROR [stderr] (default-threads - 5) at com.tibco.tibjms.TibjmsxSessionImp.run(TibjmsxSessionImp.java:4936)

The suggestion is to create the jms connection/session inside of the onMessage method instead of in the init method so that a clean connection/session is being used upon each message request.

[1] https://github.com/kiegroup/droolsjbpm-integration/blob/master/kie-server-parent/kie-server-remote/kie-server-jms/src/main/java/org/kie/server/jms/KieServerMDB.java