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https://issues.apache.org/jira/browse/SCXML-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12592544#action_12592544
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Rahul Akolkar commented on SCXML-65:
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I intend to close this issue as fixed in a week's time.
> NullPointer exceptions during triggerEvent
> ------------------------------------------
>
> Key: SCXML-65
> URL: https://issues.apache.org/jira/browse/SCXML-65
> Project: Commons SCXML
> Issue Type: Bug
> Affects Versions: 0.7
> Environment: Linux opensuse 10.2 & Sun Solaris 10
> 1.5.x java
> Reporter: luc willems
> Fix For: 0.8
>
>
> i'm using SCXML state machines in a load generation tool. this tool simulates
> a client connected to a server.
> the SCXML script used custom actions to send a request using a HTTP based
> protocol.
> the HTTP response is transformed into a event and inserted into the SCXML
> script using triggerEvent().
> each SCML executor has 1 dedicated http connection. i'm using around 2 to
> 10000 clients depending on the
> test scenario's.
> During execution of the scripts a get sporatic nullpointer exceptions. this
> DOESN'T happen all the time , it is hard to reproduce but when it happens ALL
> clients have the same problem. resetting the SCXML exector doesn't help
> 2008-01-24
> 14:33:35,593|scxml-1-88|ERROR|SCXMLUser.triggerEvents(181)|9|Current events:
> events(TriggerEvent{name=wv.status,type=3},TriggerEvent{name=wv.ok,type=3})
> 2008-01-24 14:33:35,594|scxml-1-88|ERROR|SCXMLUser.triggerEvents(182)|9|error
> scxml event trigger: null
> java.lang.NullPointerException
> at
> org.apache.commons.scxml.semantics.SCXMLSemanticsImpl.seedTargetSet(SCXMLSemanticsImpl.java:493)
> at
> org.apache.commons.scxml.semantics.SCXMLSemanticsImpl.followTransitions(SCXMLSemanticsImpl.java:652)
> at
> org.apache.commons.scxml.SCXMLExecutor.triggerEvents(SCXMLExecutor.java:127)
> at com.nsn.loadtool.scxml.SCXMLUser.triggerEvents(SCXMLUser.java:164)
> at
> com.nsn.loadtool.scxml.SCXMLAsyncExecutor$SCXMLWorker.run(SCXMLAsyncExecutor.java:101)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:650)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:675)
> at java.lang.Thread.run(Thread.java:595)
> all event triggering is done in a way that only 1 thread can trigger a event.
>
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