[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1572) sometimes getting ClassFieldExtractor error
[ http://jira.jboss.com/jira/browse/JBRULES-1572?page=comments#action_12410809 ]
Ming Fang commented on JBRULES-1572:
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I think the problem is due to a race condition in BinaryHeapQueue, the activation is being
fired twice.
The second time around the fact has already been retracted causing the exception.
Note this not example the same error as this issue says but it is the same cause.
sometimes getting ClassFieldExtractor error
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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
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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