[jbpm-dev] process instance BPMN and variable scope memory leak
paul.chaunguyen at externe.bnpparibas.com
paul.chaunguyen at externe.bnpparibas.com
Tue Jun 3 06:13:06 EDT 2014
Hi
1/ Here is my snapshot code which initilize session to use bpmn:
protected void startProcess(T processContext) throws ProcessException {
log.info("Executing BPMN process : " +
getProcessName().getProcessId() + " ...");
// init common properties when entering in process
init(processContext);
audit(processContext);
// process execution
// load up the knowledge base
StatefulKnowledgeSession ksession = null;
KnowledgeRuntimeLogger fileLogger = null;
String auditFileName = getAuditFileName(getProcessName(),
processContext);
ProcessInstance processInstance = null;
try {
ksession = omsRulesManager
.getOmsRulesService().getKnownledgeBase()
.newStatefulKnowledgeSession();
if (log.isDebugEnabled()) {
String folder = System.getProperty(
"Log4j.OUTPUT_DIR");
if (StringUtils.isEmpty(folder)) {
folder = System.getProperty(
"java.io.tmpdir");
}
String fullFileName = folder + File.
separator + auditFileName;
fileLogger =
KnowledgeRuntimeLoggerFactory.newFileLogger(
ksession, fullFileName);
ksession.addEventListener(new
DebugWorkingMemoryEventListener());
ksession.addEventListener(new
DebugAgendaEventListener());
}
log.debug("Starting workflow process : " +
getProcessName().getProcessId()
+ " ...");
ksession.setGlobal("log", log);
// populate knowledge session global
Map<String, Object> global =
getSessionGlobal(processContext);
populateGlobalSession(ksession, global);
Map<String, Object> parameters =
getProcessParameters(processContext);
ksession.insert((OrderContext) processContext);
processInstance =
ksession.startProcess(getProcessName().getProcessId(), parameters);
ksession.insert(processInstance);
ksession.fireAllRules();
if(fileLogger != null) {
fileLogger.close();
}
parameters = null;
} catch (Exception e) {
throw new ProcessException(e.getMessage(), e);
} finally {
ksession.dispose(); // free memory
processInstance = null;
ksession = null;
}
log.info("BPMN process : " + getProcessName().name() + "
executed");
}
/**
* Default
* @param processContext
* @return
*/
@SuppressWarnings("unchecked")
protected Map<String, Object>
getProcessParameters(OmsProcessContext processContext) {
Map map = new HashMap();
map.put("orderContext", (OrderContext) processContext);
return map;
}
2/ and bpmn this was very complex, I just create small one to simulate the
case
------ BEGIN BPMN -----
<?xml version="1.0" encoding="UTF-8"?>
<definitions id="Definition"
targetNamespace="http://www.jboss.org/drools"
typeLanguage="http://www.java.com/javaTypes"
expressionLanguage="http://www.mvel.org/2.0"
xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.omg.org/spec/BPMN/20100524/MODEL BPMN20.xsd"
xmlns:g="http://www.jboss.org/drools/flow/gpd"
xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI"
xmlns:dc="http://www.omg.org/spec/DD/20100524/DC"
xmlns:di="http://www.omg.org/spec/DD/20100524/DI"
xmlns:tns="http://www.jboss.org/drools">
<itemDefinition id="_orderContextItem"
structureRef="com.bp2s.oms.process.OrderContext" />
<process processType="Private" isExecutable="true"
id="com.bp2s.oms.dealing.process.OrderReceptionProcess"
name="OrderReceptionProcess"
tns:packageName="com.bp2s.oms.dealing.process" >
<extensionElements>
<tns:import name="com.bp2s.oms.corecontrol.ValidationResult" />
<tns:import
name="com.bp2s.oms.corecontrol.service.CoreControlTreeService" />
<tns:import name="com.bp2s.oms.core.service.OrderService" />
<tns:import
name="com.bp2s.oms.corecontrol.service.CoreControlTreeService.CoreControlTree"
/>
<tns:import name="com.bp2s.oms.core.error.OrderInErrorService" />
<tns:import name="com.bp2s.oms.model.common.OrderStatus.Status" />
<tns:import name="com.bp2s.oms.model.process.Disposition" />
<tns:import name="com.bp2s.oms.model.staticdata.Fund" />
<tns:import name="com.bp2s.oms.model.task.TaskContext" />
<tns:import name="com.bp2s.oms.process.OmsProcessContext" />
<tns:import name="com.bp2s.oms.process.OrderContext" />
<tns:import
name="com.bp2s.oms.process.OmsProcessContext.IncomingMode" />
<tns:import name="com.bp2s.oms.process.OmsProcessContext.ComingFrom"
/>
<tns:import name="com.bp2s.oms.status.management.OrderStatusService"
/>
<tns:import name="com.bp2s.oms.task.TaskContextFactory" />
<tns:import name="com.bp2s.oms.task.TaskContextQueue" />
<tns:import name="com.bp2s.oms.corecontrol.CoreControlError" />
<tns:import name="org.apache.commons.logging.Log" />
<tns:import name="com.bp2s.oms.model.process.OrderInError" />
<tns:import name="com.bp2s.oms.model.process.Operation" />
<tns:import name="java.util.List" />
<tns:import
name="com.bp2s.oms.corecontrol.CoreControlError.ErrorCode" />
<tns:import name="com.bp2s.oms.dao.StoredProcedureDAO" />
<tns:global identifier="queue" type="TaskContextQueue" />
<tns:global identifier="orderService" type="OrderService" />
<tns:global identifier="coreControlTreeService"
type="CoreControlTreeService" />
<tns:global identifier="storedProcedureDAO" type="StoredProcedureDAO"
/>
<tns:global identifier="taskContextFactory" type="TaskContextFactory"
/>
<tns:global identifier="log" type="Log" />
<tns:global identifier="orderStatusService" type="OrderStatusService"
/>
<tns:global identifier="orderInErrorService"
type="OrderInErrorService" />
</extensionElements>
<!-- process variables -->
<property id="orderContext" itemSubjectRef="_orderContextItem"/>
<!-- nodes -->
<startEvent id="_1" name="StartProcess" />
<endEvent id="_2" name="End" >
<terminateEventDefinition />
</endEvent>
<scriptTask id="_3" name="test parameters " scriptFormat="
http://www.java.com/java" >
<script>log.info("I am here : " + orderContext.toString());</script>
</scriptTask>
<!-- connections -->
<sequenceFlow id="_3-_2" sourceRef="_3" targetRef="_2" />
<sequenceFlow id="_1-_3" sourceRef="_1" targetRef="_3" />
</process>
<bpmndi:BPMNDiagram>
<bpmndi:BPMNPlane
bpmnElement="com.bp2s.oms.dealing.process.OrderReceptionProcess" >
<bpmndi:BPMNShape bpmnElement="_1" >
<dc:Bounds x="324" y="82" width="48" height="48" />
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_2" >
<dc:Bounds x="324" y="264" width="48" height="48" />
</bpmndi:BPMNShape>
<bpmndi:BPMNShape bpmnElement="_3" >
<dc:Bounds x="240" y="168" width="217" height="48" />
</bpmndi:BPMNShape>
<bpmndi:BPMNEdge bpmnElement="_3-_2" >
<di:waypoint x="348" y="192" />
<di:waypoint x="348" y="288" />
</bpmndi:BPMNEdge>
<bpmndi:BPMNEdge bpmnElement="_1-_3" >
<di:waypoint x="348" y="106" />
<di:waypoint x="348" y="192" />
</bpmndi:BPMNEdge>
</bpmndi:BPMNPlane>
</bpmndi:BPMNDiagram>
</definitions>
----- END BPMN
3/ Memory dump after forcing GC
OrderContext is always here after calling BPMN with orderContext in
process parameter
Thanks in advance,
Regards,
Paul
Re: [jbpm-dev] process instance BPMN and variable scope memory leak
(Internet)
salaboy
To:
Paul CHAU N'GUYEN
Cc:
jbpm-dev
03/06/2014 11:58
Can you please provide a reproducer for this:
2/ We try to change this in moving object (prototype) to process
parameters map, --> still the same issue: after bpmn execution object is
still there JVM garbage collection can not removed it
so we can check it out?
Usually a Junit inside a maven project is enough
On Tue, Jun 3, 2014 at 10:41 AM, <paul.chaunguyen at externe.bnpparibas.com>
wrote:
Dear all,
We are facing big issue with variable scope so application failed to out
of memory with BPMN.
Our situtation is below
1/ Initially, we put an object (prototype) as global inside BPMN --> after
bpmn execution object is still there JVM garbage collection can not
removed it
2/ We try to change this in moving object (prototype) to process
parameters map, --> still the same issue: after bpmn execution object is
still there JVM garbage collection can not removed it
3/ We try to use this object as facts but can not get the good syntax in
java dialect to process as document or user guide related BPMN is very
poor, Can you help please ?
Many thanks,
Regards,
Paul
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