@Test
public void create2ProcessInstances() throws Exception {
long[] processId = new long[2];
StatefulKnowledgeSession ksession = reloadKnowledgeSession();
processId[0] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
processId[1] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
ksession.dispose();
assertProcessInstancesExist(processId);
}
@Test
public void create2ProcessInstancesInsideTransaction() throws Exception {
long[] processId = new long[2];
UserTransaction ut = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");
ut.begin();
StatefulKnowledgeSession ksession = reloadKnowledgeSession();
processId[0] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
processId[1] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
assertEquals(2, ksession.getProcessInstances().size());
// process instance manager cache flushed on tx
ut.commit();
assertEquals(0, ksession.getProcessInstances().size());
ksession = reloadKnowledgeSession(ksession);
assertEquals(0, ksession.getProcessInstances().size());
ksession.dispose();
assertProcessInstancesExist(processId);
}
@Test
public void noProcessInstancesLeftWithPreTxKSessionAndRollback() throws Exception {
long[] notProcess = new long[4];
StatefulKnowledgeSession ksession = reloadKnowledgeSession();
UserTransaction ut = (UserTransaction) new InitialContext().lookup("java:comp/UserTransaction");
ut.begin();
notProcess[0] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
notProcess[1] =
ksession.createProcessInstance("org.jbpm.processinstance.helloworld", null).getId();
ut.rollback();
// Validate that proc inst mgr cache is also flushed on rollback
assertEquals(0, ksession.getProcessInstances().size());
ksession = reloadKnowledgeSession(ksession);
assertEquals(0, ksession.getProcessInstances().size());
ksession.dispose();
assertProcessInstancesNotExist(notProcess);
}
private void createKnowledgeSessionStartProcessEtc(KieBase kbase) {
logger.info("session count=" + kbase.getKieSessions().size());
StatefulKnowledgeSession ksession =
JPAKnowledgeService.newStatefulKnowledgeSession(
kbase, getKnowledgeSessionConfiguration(), env);
addEventListenersToSession(ksession);
/**
* The following log line caused the memory leak. The specific (reverse-ordered) stack trace is
* the following:
*
* <p>MemoryLeakTest.createKnowledgeSessionStartProcessEtc(KnowledgeBase) calls
* kbase.getKieSessions() .. KnowledgeBaseImpl.getStatefulKnowledgeSessions() line: 186
* StatefulKnowledgeSessionImpl.<init>(ReteooWorkingMemory, KnowledgeBase) line: 121
* ReteooStatefulSession(AbstractWorkingMemory).setKnowledgeRuntime(InternalKnowledgeRuntime)
* line: 1268 ReteooStatefulSession(AbstractWorkingMemory).createProcessRuntime() line: 342
* ProcessRuntimeFactory.newProcessRuntime(AbstractWorkingMemory) line: 12
* ProcessRuntimeFactoryServiceImpl.newProcessRuntime(AbstractWorkingMemory) line: 1
* ProcessRuntimeFactoryServiceImpl.newProcessRuntime(AbstractWorkingMemory) line: 10
* ProcessRuntimeImpl.<init>(AbstractWorkingMemory) line: 84
* ProcessRuntimeImpl.initProcessEventListeners() line: 215
*
* <p>And ProcessRuntimeImpl.initProcessEventListeners() is what adds a new listener to
* AbstractRuleBase.eventSupport.listeners via this line (235):
* kruntime.getKnowledgeBase().addEventListener(knowledgeBaseListener);
*
* <p>The StatefulKnowledgeSessionImpl instance created in this .getStatefulKnowledgeSessions()
* method is obviously never disposed, which means that the listener is never removed. The
* listener then contains a link to a field (signalManager) of the ProcessRuntimeImpl, which
* contains a link to the StatefulKnowledgeSessionImpl instance created here. etc..
*/
logger.info("session count=" + kbase.getKieSessions().size());
TestWorkItemHandler handler = new TestWorkItemHandler();
ksession.getWorkItemManager().registerWorkItemHandler("Human Task", handler);
try {
// create process instance, insert into session and start process
Map<String, Object> processParams = new HashMap<String, Object>();
String[] fireballVarHolder = new String[1];
processParams.put("fireball", fireballVarHolder);
ProcessInstance processInstance = ksession.createProcessInstance(PROCESS_NAME, processParams);
ksession.insert(processInstance);
ksession.startProcessInstance(processInstance.getId());
// after the log line has been added, the DefaultProcessEventListener registered
// in the addEventListenersToSession() method no longer works?!?
ksession.fireAllRules();
// test process variables
String[] procVar =
(String[]) ((WorkflowProcessInstance) processInstance).getVariable("fireball");
assertEquals("Rule task did NOT fire or complete.", "boom!", procVar[0]);
// complete task and process
Map<String, Object> results = new HashMap<String, Object>();
results.put("chaerg", new SerializableResult("zhrini", 302l, "F", "A", "T"));
ksession.getWorkItemManager().completeWorkItem(handler.getWorkItem().getId(), results);
assertNull(ksession.getProcessInstance(processInstance.getId()));
} finally {
// This should clean up all listeners, but doesn't -> see docs above
ksession.dispose();
}
}