dcmaf opened a new issue, #6422:
URL: https://github.com/apache/incubator-kie-drools/issues/6422
We have encountered a null pointer exception being thrown due to an attempt
to remove a tuple from the dormant matches list when the tuple is not on the
list. An example call stack is included below (10.1.0 code base).
We do not have a unit test that reproduces this exception. It has been
observed in two instances: one involved the insertion of logical facts, which
was resolved by not using logical when inserting the facts. The other involves
a rule that is extended by two other rules. We are able to work around the
second issue by locally building drools-core and adding a check that the tuple
is on the dormant matches list before attempting to remove it in
RuleExecutor::modifyActiveTuple, as shown below:
```java
public void modifyActiveTuple(RuleTerminalNodeLeftTuple tuple) {
if (dormantMatches.contains(tuple))
removeDormantTuple(tuple);
addActiveTuple(tuple);
}
```
@mariofusco This issue appears to have been introduced by
[KIE-1064](https://github.com/apache/incubator-kie-issues/issues/1064) (see PR
https://github.com/apache/incubator-kie-drools/pull/5821 and commit
https://github.com/apache/incubator-kie-drools/pull/5852/commits/f7e16a6ea06822606ed986a201dcb2fb4028a517).
Call stack example:
```
Caused by: java.lang.NullPointerException: Cannot invoke
"org.drools.core.util.DoubleLinkedEntry.setNext(org.drools.core.util.SingleLinkedEntry)"
because the return value of
"org.drools.core.util.DoubleLinkedEntry.getPrevious()" is null
at org.drools.core.util.LinkedList.remove(LinkedList.java:178)
at
org.drools.core.phreak.RuleExecutor.removeDormantTuple(RuleExecutor.java:318)
at
org.drools.core.phreak.RuleExecutor.modifyActiveTuple(RuleExecutor.java:338)
at
org.drools.core.phreak.PhreakRuleTerminalNode.doLeftTupleUpdate(PhreakRuleTerminalNode.java:224)
at
org.drools.core.phreak.PhreakRuleTerminalNode.doLeftUpdates(PhreakRuleTerminalNode.java:166)
at
org.drools.core.phreak.PhreakRuleTerminalNode.doNode(PhreakRuleTerminalNode.java:56)
at
org.drools.core.phreak.RuleNetworkEvaluator.innerEval(RuleNetworkEvaluator.java:335)
at
org.drools.core.phreak.RuleNetworkEvaluator.evalStackEntry(RuleNetworkEvaluator.java:251)
at
org.drools.core.phreak.RuleNetworkEvaluator.outerEval(RuleNetworkEvaluator.java:194)
at
org.drools.core.phreak.RuleNetworkEvaluator.evaluateNetwork(RuleNetworkEvaluator.java:147)
at
org.drools.core.phreak.RuleExecutor.evaluateNetwork(RuleExecutor.java:230)
at
org.drools.core.phreak.RuleExecutor.evaluateNetworkIfDirty(RuleExecutor.java:240)
at
org.drools.core.phreak.RuleExecutor.evaluateNetworkAndFire(RuleExecutor.java:85)
at
org.drools.core.concurrent.AbstractGroupEvaluator.evaluateAndFire(AbstractGroupEvaluator.java:49)
at
org.drools.kiesession.agenda.DefaultAgenda.fireLoop(DefaultAgenda.java:620)
at
org.drools.kiesession.agenda.DefaultAgenda.internalFireAllRules(DefaultAgenda.java:573)
at
org.drools.kiesession.agenda.DefaultAgenda.fireAllRules(DefaultAgenda.java:565)
```
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