[rules-users] Ascending sort by salience results in NPE

[Davide Sottara]

salience -$prio (no space between - and $prio)
is a workaround too. Mario and I are investigating for a possible bug
involving the unary "-"

On 10/16/2013 10:00 PM, Wolfgang Laun wrote:
> rule "process Token"
> salience  - $prio   // by ascending x25No values
> when
>     $token: Token( $x25No: x25No )  //  match on int x25No
>     $elem: ElemType( $prio: x25No == $x25No )
> then
>     retract($token);
> end
>
> All versions 5.[2345].0 crash. Using "0 - $prio" is a workaround.
>
> Exception in thread "main" java.lang.NullPointerException
> 	at org.drools.base.mvel.MVELSalienceExpression.getValue(MVELSalienceExpression.java:93)
> 	at org.drools.common.DefaultAgenda.createActivation(DefaultAgenda.java:579)
> 	at org.drools.reteoo.RuleTerminalNode.assertLeftTuple(RuleTerminalNode.java:253)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.propagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:71)
> 	at org.drools.reteoo.JoinNode.propagateFromLeft(JoinNode.java:107)
> 	at org.drools.reteoo.JoinNode.assertLeftTuple(JoinNode.java:95)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.doPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:196)
> 	at org.drools.reteoo.SingleLeftTupleSinkAdapter.createAndPropagateAssertLeftTuple(SingleLeftTupleSinkAdapter.java:145)
> 	at org.drools.reteoo.LeftInputAdapterNode.assertObject(LeftInputAdapterNode.java:154)
> 	at org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:59)
> 	at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:235)
> 	at org.drools.reteoo.EntryPointNode.assertObject(EntryPointNode.java:240)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:350)
> 	at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:311)
> 	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:903)
> 	at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)
> 	at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)
> 	at geninq.Main.execute(Main.java:97)
> 	at geninq.Main.main(Main.java:133)
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