NullPointer exceptions during triggerEvent
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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
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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