You are probably asserting an AlarmClock fact whose alarmTime field is
set to null.
It is easy to check if that is the case. Change your constraints to:
uhr : AlarmClock( applianceStateResource == ApplianceStateEnum.on,
location == room, $alarmTime : alarmTime != null )
And the NPE should stop.
[]s
Edson
2007/5/9, seeker <[EMAIL PROTECTED]>:
I use Drools 3.0.6 and I get some NullPointerException when creating my
facts:
Exception in thread "main" org.drools.RuntimeDroolsException:
java.lang.NullPointerException
at org.drools.rule.EvalCondition.isAllowed(Unknown Source)
at org.drools.reteoo.EvalConditionNode.assertTuple(Unknown Source)
at org.drools.reteoo.TupleSource.propagateAssertTuple(Unknown
Source)
at org.drools.reteoo.JoinNode.assertObject(Unknown Source)
at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown
Source)
at org.drools.reteoo.AlphaNode.assertObject(Unknown Source)
at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown
Source)
at org.drools.reteoo.ObjectTypeNode.assertObject(Unknown Source)
at org.drools.reteoo.Rete.assertObject(Unknown Source)
at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)
at org.drools.reteoo.ReteooWorkingMemory.doAssertObject(Unknown
Source)
at org.drools.common.AbstractWorkingMemory.assertObject(Unknown
Source)
at org.drools.common.AbstractWorkingMemory.assertObject(Unknown
Source)
...
Caused by: java.lang.NullPointerException
at org.sercho.shem.rules.Rule_Zeittest_0.eval0
(Rule_Zeittest_0.java:25)
at
org.sercho.shem.rules.Rule_Zeittest_0Eval0Invoker.evaluate
(Rule_Zeittest_0Eval0Invoker.java:19)
... 21 more
The rule that is causing this goes like this:
rule "Zeittest"
when
room : Room ( )
uhr : AlarmClock( applianceStateResource ==
ApplianceStateEnum.on,
location == room, $alarmTime : alarmTime )
eval( $alarmTime.getHours() > 10 )
then
...
If I omit the eval, ths error will not occur (and I can access
$alarmTime.getHours() in RHS)
I wonder if I do something wrong or if it is a Drools bug.
Any hints ?
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--
Edson Tirelli
Software Engineer - JBoss Rules Core Developer
Office: +55 11 3529-6000
Mobile: +55 11 9287-5646
JBoss, a division of Red Hat @ www.jboss.com
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