[rules-users] NullPointerException with LeftTupleIndexHashTable.remove()

[nxv]

Hello,

I keep trying to migrate drools from 5.5 to 6 on my project.  I found a
second regression/issue.  I'm trying to produce a unit test for
6.1.0-SNAPSHOT but I face some difficulties to determine the cause of this
issue.  So I have a drl with 3 rules.  I'm a bit disappointed because if I
switch two rules (without modifying anything, just switch one rule with
another in the drl file), the NPE disappears... 


Here is the stacktrace:

java.lang.NullPointerException
	at
org.drools.core.util.index.LeftTupleIndexHashTable.remove(LeftTupleIndexHashTable.java:386)
	at
org.drools.core.phreak.RuleNetworkEvaluator.doUpdatesReorderLeftMemory(RuleNetworkEvaluator.java:799)
	at org.drools.core.phreak.PhreakJoinNode.doNode(PhreakJoinNode.java:38)
	at
org.drools.core.phreak.RuleNetworkEvaluator.switchOnDoBetaNode(RuleNetworkEvaluator.java:547)
	at
org.drools.core.phreak.RuleNetworkEvaluator.evalBetaNode(RuleNetworkEvaluator.java:533)
	at
org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:334)
	at
org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:161)
	at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:116)
	at
org.drools.core.phreak.RuleExecutor.reEvaluateNetwork(RuleExecutor.java:201)
	at
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:68)
	at
org.drools.core.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:935)
	at
org.drools.core.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1200)
	at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:952)
	at
org.drools.core.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:926)
	at
org.drools.core.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:232)
	at
org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:106)
	at
org.drools.core.command.runtime.rule.FireAllRulesCommand.execute(FireAllRulesCommand.java:32)
	at
org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:155)
	at
org.drools.core.command.runtime.BatchExecutionCommandImpl.execute(BatchExecutionCommandImpl.java:76)
	at
org.drools.core.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:334)





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