8:01 a.m.
Mehul Vyas [https://community.jboss.org/people/vyasmehul] created the discussion
"Running Business Rule in a Multi Threaded Environment (JEE)"
To view the discussion, visit: https://community.jboss.org/message/806005#806005
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Hello,
We are using JBoss BRMS 5.3 on Websphere Application Server 8.x. We are using batch
processing framework and hence on J2EE environment there would be multiple instances of a
job processing data. Now the issue is that the processing framework we use supports
parallel job execution. The same is probably not supported in JBoss BRMS due to which
while executing business rule in a parallel mode the following exception is seen. The code
to execute business rule is as below:
knowledgeBase = knowledgeAgent.getKnowledgeBase();
statefulKnowledgeSession = knowledgeBase
.newStatefulKnowledgeSession();
statefulKnowledgeSession.getAgenda().getAgendaGroup(agendaName)
.setFocus();
if (!commands.isEmpty()) {
// execute the business rule
commands.add(CommandFactory.newFireAllRules());
executionResults = statefulKnowledgeSession
.execute(CommandFactory.newBatchExecution(commands));
}
at in.gov.tds.util.JbrmsUtil.executeBusinessRule(JbrmsUtil.java:230)
at
in.gov.tds.processing.bo.impl.DefaultProcessingBOImpl.getInterestRate(DefaultProcessingBOImpl.java:192)
at
in.gov.tds.processing.batchprocessor.DefaultAndInterestComputationBatchProcessor.getInterestRateMap(DefaultAndInterestComputationBatchProcessor.java:931)
at
in.gov.tds.processing.batchprocessor.DefaultAndInterestComputationBatchProcessor.processRecord(DefaultAndInterestComputationBatchProcessor.java:292)
at
com.ibm.websphere.batch.devframework.steps.technologyadapters.GenericXDBatchStep.processRecord(GenericXDBatchStep.java:263)
at
com.ibm.websphere.batch.devframework.steps.technologyadapters.GenericXDBatchStep.processJobStep(GenericXDBatchStep.java:227)
at
com.ibm.ws.gridcontainer.batch.impl.StepManagerImpl._regularJobBatchLoop(StepManagerImpl.java:1200)
at
com.ibm.ws.gridcontainer.batch.impl.StepManagerImpl.executeStep(StepManagerImpl.java:368)
at
com.ibm.ws.gridcontainer.security.actions.ExecuteStepBatchUserPrivilegedAction.executeAction(ExecuteStepBatchUserPrivilegedAction.java:47)
at
com.ibm.ws.gridcontainer.security.AbstractUserPrivilegedAction.runWithoutSecurity(AbstractUserPrivilegedAction.java:66)
at
com.ibm.ws.gridcontainer.services.impl.WASRunUnderCredentialServiceImpl.runUnderUserCredential(WASRunUnderCredentialServiceImpl.java:134)
at
com.ibm.ws.gridcontainer.services.impl.WASRunUnderCredentialServiceImpl.runActionUnderUserCredential(WASRunUnderCredentialServiceImpl.java:386)
at
com.ibm.ws.gridcontainer.batch.impl.JobManagerImpl._sequentialStepScheduling(JobManagerImpl.java:746)
at
com.ibm.ws.gridcontainer.batch.impl.JobManagerImpl.executeJob(JobManagerImpl.java:198)
at com.ibm.ws.batch.BatchJobControllerWork._runJob(BatchJobControllerWork.java:299)
at com.ibm.ws.batch.BatchJobControllerWork.run(BatchJobControllerWork.java:219)
at com.ibm.ws.asynchbeans.J2EEContext$RunProxy.run(J2EEContext.java:269)
at java.security.AccessController.doPrivileged(AccessController.java:229)
at com.ibm.ws.asynchbeans.J2EEContext.run(J2EEContext.java:795)
at
com.ibm.ws.asynchbeans.WorkWithExecutionContextImpl.go(WorkWithExecutionContextImpl.java:222)
at com.ibm.ws.asynchbeans.ABWorkItemImpl.run(ABWorkItemImpl.java:206)
at java.lang.Thread.run(Thread.java:770)
Caused by: java.util.NoSuchElementException
at java.util.LinkedList.getLast(LinkedList.java:548)
at org.drools.common.DefaultAgenda.getNextFocus(DefaultAgenda.java:607)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1020)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:737)
at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:701)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:218)
at
org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:106)
at
org.drools.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:32)
at
org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:155)
at
org.drools.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:76)
at
org.drools.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:809)
at
org.drools.impl.StatefulKnowledgeSessionImpl.execute(StatefulKnowledgeSessionImpl.java:781)
at in.gov.tds.util.JbrmsUtil.executeBusinessRule(JbrmsUtil.java:220)
... 21 more
1) Is this known? Can we change the code to make it synchronized and hence to make it
thread safe?
2) Is this known issue? Are there any workaround to resolve this issue other than changing
code to make it synchronized because J2EE environment is thread safe?
Thanks,
Mehul
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