2:52 a.m.
After re-loading a session, and trying to send it an Event, I get the following
NullPointerException:
java.lang.NullPointerException
at
org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper.beforeRuleFlowNodeTriggered(StatefulKnowledgeSessionImpl.java:674)
at
org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(RuleFlowEventSupport.java:147)
at org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:110)
at
org.drools.workflow.instance.node.EventNodeInstance.signalEvent(EventNodeInstance.java:50)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:272)
at
com.csatp.svc.rulesmgr.claim.ClaimsDemoJpaTest.validateDocumentWorkflow2(ClaimsDemoJpaTest.java:209)
My code is pretty straightforward:
StatefulKnowledgeSession session = JPAKnowledgeService.loadStatefulKnowledgeSession(
1, knowledgeBase, null, env );
ProcessInstance process = session.getProcessInstance(2);
process.signalEvent("ReceiveDocsEvent", null);
that same code (and Flow) works on a session created from
knowledgeBase.newStatefulKnowledgeSession();
This is difficult for me to debug, but here's what I have:
In org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(), the code is
getting listeners:
final Iterator<RuleFlowEventListener> iter = getEventListenersIterator();
then iterating over them. In the session created from a regular knowledgeBase,
"iter" has the following values
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @ 3411}
snapshot = {java.lang.Object[2] @ 3416}
[0] = {org.drools.audit.WorkingMemoryFileLogger @ 3417}
events = {java.util.ArrayList @ 3419} size = 77
fileName = {java.lang.String @ 3420}"log/claimsdemo"
maxEventsInMemory = 1000
nbOfFile = 0
split = true
initialized = false
filters = {java.util.ArrayList @ 3421} size = 0
[1] = {org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper @
3418}
listener = {com.csatp.svc.rulesmgr.claim.TrackingProcessEventListener @ 3396}
While the session created using JPAKnowledgeService has the following values for
"iter"
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @ 3803}
snapshot = {java.lang.Object[1] @ 3805}
[0] = {org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper @
3806}
listener = null
I can see that the EventListeners should be setup in AbstractEventSupport and it's
implementing classes,
and they are clearly missing, but I'm not sure where this is going wrong.
I'll gladly fix this, but just don't know where to start, if you have any ideas
that can help, I'd greatly appreciate it!
Bill
9:53 p.m.
Bill,
When using persistence, you should make sure that all modifications to
the process instances are executed through the session, as that will
make sure they are performed in a transaction and that the changes are
persisted afterwards.
Therefore, you should not change a process instance that you retrieved
using getProcessInstance(id). In this case, you should use
ksession.signalEvent(type, event, id) instead of calling signalEvent on
the process instance itself. You'll need to update to the latest trunk
though, as I only just added this method to drools-api (the
implementation has been in drools-core for some time now but the method
was apparently not added to drools-api yet).
Let me know if you still have issues when using this method to signal
events.
Kris
Quoting Bill Tarr <javatestcase(a)yahoo.com>:
After re-loading a session, and trying to send it an Event, I get
the
following NullPointerException:
java.lang.NullPointerException
at
org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper.beforeRuleFlowNodeTriggered(StatefulKnowledgeSessionImpl.java:674)
at
org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(RuleFlowEventSupport.java:147)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:110)
at
org.drools.workflow.instance.node.EventNodeInstance.signalEvent(EventNodeInstance.java:50)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:272)
at
com.csatp.svc.rulesmgr.claim.ClaimsDemoJpaTest.validateDocumentWorkflow2(ClaimsDemoJpaTest.java:209)
My code is pretty straightforward:
StatefulKnowledgeSession session =
JPAKnowledgeService.loadStatefulKnowledgeSession( 1, knowledgeBase,
null, env );
ProcessInstance process = session.getProcessInstance(2);
process.signalEvent("ReceiveDocsEvent", null);
that same code (and Flow) works on a session created from
knowledgeBase.newStatefulKnowledgeSession();
This is difficult for me to debug, but here's what I have:
In
org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(),
the code is getting listeners:
final Iterator<RuleFlowEventListener> iter =
getEventListenersIterator();
then iterating over them. In the session created from a regular
knowledgeBase, "iter" has the following values
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @
3411}
snapshot = {java.lang.Object[2] @ 3416}
[0] = {org.drools.audit.WorkingMemoryFileLogger @ 3417}
events = {java.util.ArrayList @ 3419} size = 77
fileName = {java.lang.String @ 3420}"log/claimsdemo"
maxEventsInMemory = 1000
nbOfFile = 0
split = true
initialized = false
filters = {java.util.ArrayList @ 3421} size = 0
[1] =
{org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper
@ 3418}
listener =
{com.csatp.svc.rulesmgr.claim.TrackingProcessEventListener @ 3396}
While the session created using JPAKnowledgeService has the following
values for "iter"
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @
3803}
snapshot = {java.lang.Object[1] @ 3805}
[0] =
{org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper
@ 3806}
listener = null
I can see that the EventListeners should be setup in
AbstractEventSupport and it's implementing classes,
and they are clearly missing, but I'm not sure where this is going
wrong.
I'll gladly fix this, but just don't know where to start, if you have
any ideas that can help, I'd greatly appreciate it!
Bill
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7:49 p.m.
Hi Kris,
OK, I see new the signature in the ProcessRuntime interface:
signalEvent(String type, Object event, long processInstanceId);
I'll try and test that out today.
Thanks for taking the time to fix up the code!
Bill
----- Original Message ----
From: Kris Verlaenen <kris.verlaenen(a)cs.kuleuven.be>
To: Rules Users List <rules-users(a)lists.jboss.org>; Bill Tarr
<javatestcase(a)yahoo.com>
Sent: Sun, October 25, 2009 1:53:32 PM
Subject: Re: [rules-users] [droolsflow] - JPAKnowledgeService - Another Event based
NullPointerException
Bill,
When using persistence, you should make sure that all modifications to
the process instances are executed through the session, as that will
make sure they are performed in a transaction and that the changes are
persisted afterwards.
Therefore, you should not change a process instance that you retrieved
using getProcessInstance(id). In this case, you should use
ksession.signalEvent(type, event, id) instead of calling signalEvent on
the process instance itself. You'll need to update to the latest trunk
though, as I only just added this method to drools-api (the
implementation has been in drools-core for some time now but the method
was apparently not added to drools-api yet).
Let me know if you still have issues when using this method to signal
events.
Kris
Quoting Bill Tarr <javatestcase(a)yahoo.com>:
After re-loading a session, and trying to send it an Event, I get
the
following NullPointerException:
java.lang.NullPointerException
at
org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper.beforeRuleFlowNodeTriggered(StatefulKnowledgeSessionImpl.java:674)
at
org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(RuleFlowEventSupport.java:147)
at
org.drools.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:110)
at
org.drools.workflow.instance.node.EventNodeInstance.signalEvent(EventNodeInstance.java:50)
at
org.drools.workflow.instance.impl.WorkflowProcessInstanceImpl.signalEvent(WorkflowProcessInstanceImpl.java:272)
at
com.csatp.svc.rulesmgr.claim.ClaimsDemoJpaTest.validateDocumentWorkflow2(ClaimsDemoJpaTest.java:209)
My code is pretty straightforward:
StatefulKnowledgeSession session =
JPAKnowledgeService.loadStatefulKnowledgeSession( 1, knowledgeBase,
null, env );
ProcessInstance process = session.getProcessInstance(2);
process.signalEvent("ReceiveDocsEvent", null);
that same code (and Flow) works on a session created from
knowledgeBase.newStatefulKnowledgeSession();
This is difficult for me to debug, but here's what I have:
In
org.drools.event.RuleFlowEventSupport.fireBeforeRuleFlowNodeTriggered(),
the code is getting listeners:
final Iterator<RuleFlowEventListener> iter =
getEventListenersIterator();
then iterating over them. In the session created from a regular
knowledgeBase, "iter" has the following values
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @
3411}
snapshot = {java.lang.Object[2] @ 3416}
[0] = {org.drools.audit.WorkingMemoryFileLogger @ 3417}
events = {java.util.ArrayList @ 3419} size = 77
fileName = {java.lang.String @ 3420}"log/claimsdemo"
maxEventsInMemory = 1000
nbOfFile = 0
split = true
initialized = false
filters = {java.util.ArrayList @ 3421} size = 0
[1] =
{org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper
@ 3418}
listener =
{com.csatp.svc.rulesmgr.claim.TrackingProcessEventListener @ 3396}
While the session created using JPAKnowledgeService has the following
values for "iter"
iter = {java.util.concurrent.CopyOnWriteArrayList$COWIterator @
3803}
snapshot = {java.lang.Object[1] @ 3805}
[0] =
{org.drools.impl.StatefulKnowledgeSessionImpl$ProcessEventListenerWrapper
@ 3806}
listener = null
I can see that the EventListeners should be setup in
AbstractEventSupport and it's implementing classes,
and they are clearly missing, but I'm not sure where this is going
wrong.
I'll gladly fix this, but just don't know where to start, if you have
any ideas that can help, I'd greatly appreciate it!
Bill
_______________________________________________
rules-users mailing list
rules-users(a)lists.jboss.org
https://lists.jboss.org/mailman/listinfo/rules-users
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2 comments
2 participants
participants (2)
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Bill Tarr -
Kris Verlaenen