[jboss-jira] [JBoss JIRA] Commented: (JBRULES-1572) sometimes getting ClassFieldExtractor error
[ http://jira.jboss.com/jira/browse/JBRULES-1572?page=comments#action_12411687 ]
Ming Fang commented on JBRULES-1572:
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Looking at the code some more.
You're correct that the inserts are protected via the lock, but the fireAllRules()
does not check that lock.
Therefore it is possible for a thread to call fireAllRules() and another to be calling
insert(), both end up modifying the same BinaryHeapQueue at the same time.
My workaround for this problem is to make the mutating methods of BinaryHeapQueue
synchronized. I have not had the problem since doing so.
This problem nearly cost me my job so if you push this to 5.x then I'll have no choice
but to use my private build with this fix in it.
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
Fix For: 5.0.0-M1
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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