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http://jira.jboss.com/jira/browse/JBRULES-1572?page=comments#action_12411685 ]
Mark Proctor commented on JBRULES-1572:
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Actually thinking about this some more, I'm wondering if the error is not thread
racing, but actually stale data. While we can only have one thread executing at the same
time each thread is responsible for the fact propagation and activation creation and
queueing. due to stale data in theory each thread could see out of sync versions of some
of the data structures. Hence while your synch on the queue methods worked. Synchronising
access to all data structures is not feasible, it would kill performance. I'm
wondering if there is actually more deep seated problems here. It seems like the only real
solution is the engine can only be executed in its Thread of creation, all other threads
would message their changes into that thread. Will discuss this with the other developers,
but its a 5.0.x thing, sorry.
sometimes getting ClassFieldExtractor error
-------------------------------------------
Key: JBRULES-1572
URL:
http://jira.jboss.com/jira/browse/JBRULES-1572
Project: JBoss Drools
Issue Type: Bug
Security Level: Public(Everyone can see)
Affects Versions: 5.0.0-M1, 4.0.4, 4.0.7
Reporter: Ming Fang
Assigned To: Mark Proctor
Attachments: Foo.java, rule.drl, Test.java, Test.java
Caused by: java.lang.NullPointerException
at org.drools.base.com.ml.ax.ModelValue10285014$getModelValue.getDoubleValue(Unknown
Source)
at org.drools.base.ClassFieldExtractor.getDoubleValue(ClassFieldExtractor.java:191)
at org.drools.rule.Declaration.getDoubleValue(Declaration.java:281)
at
com.ml.ax.drools.Rule_Quote_0ConsequenceInvoker.evaluate(Rule_Quote_0ConsequenceInvoker.java:17)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:586)
This only happens sometimes but it completely breaks my program.
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