Hello,

I am getting the following intermittent error from drools 5.0.1 when removing a knowledge package from a knowledge base:

org.drools.reteoo.BetaMemory cannot be cast to org.drools.reteoo.RuleTerminalNode$TerminalNodeMemory

I iterate over knowledgeBase.getKnowledgePackages() and the error occurs, but only occasionally.

The full trace is as follows:

java.lang.ClassCastException: org.drools.reteoo.BetaMemory cannot be cast to org.drools.reteoo.RuleTerminalNode$TerminalNodeMemory

at org.drools.reteoo.RuleTerminalNode.doRemove(RuleTerminalNode.java:357)

at org.drools.common.BaseNode.remove(BaseNode.java:95)

at org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:237)

at org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:366)

at org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:712)

at org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:640)

at org.drools.impl.KnowledgeBaseImpl.removeKnowledgePackage(KnowledgeBaseImpl.java:166)

Any ideas why this would potentially happen?

Cheerio,

Nic

Nicholas Hemley

Senior Developer

Sidonis | Powering a New Generation of Service Assurance