You are probably asserting an AlarmClock fact whose alarmTime field is set to null.<br><br> It is easy to check if that is the case. Change your constraints to:<br><br>uhr : AlarmClock( applianceStateResource == ApplianceStateEnum.on
,<br>location == room, $alarmTime : alarmTime != null )<br><br> And the NPE should stop.<br><br> []s<br> Edson<br><br><br><div><span class="gmail_quote">2007/5/9, seeker <<a href="mailto:janko.dimitroff@dai-labor.de">
janko.dimitroff@dai-labor.de</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><br>I use Drools 3.0.6 and I get some NullPointerException when creating my
<br>facts:<br><br>Exception in thread "main" org.drools.RuntimeDroolsException:<br>java.lang.NullPointerException<br> at org.drools.rule.EvalCondition.isAllowed(Unknown Source)<br> at org.drools.reteoo.EvalConditionNode.assertTuple
(Unknown Source)<br> at org.drools.reteoo.TupleSource.propagateAssertTuple(Unknown Source)<br> at org.drools.reteoo.JoinNode.assertObject(Unknown Source)<br> at org.drools.reteoo.ObjectSource.propagateAssertObject
(Unknown Source)<br> at org.drools.reteoo.AlphaNode.assertObject(Unknown Source)<br> at org.drools.reteoo.ObjectSource.propagateAssertObject(Unknown Source)<br> at org.drools.reteoo.ObjectTypeNode.assertObject
(Unknown Source)<br> at org.drools.reteoo.Rete.assertObject(Unknown Source)<br> at org.drools.reteoo.ReteooRuleBase.assertObject(Unknown Source)<br> at org.drools.reteoo.ReteooWorkingMemory.doAssertObject
(Unknown Source)<br> at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)<br> at org.drools.common.AbstractWorkingMemory.assertObject(Unknown Source)<br>...<br>Caused by: java.lang.NullPointerException
<br> at org.sercho.shem.rules.Rule_Zeittest_0.eval0(Rule_Zeittest_0.java:25)<br> at<br>org.sercho.shem.rules.Rule_Zeittest_0Eval0Invoker.evaluate(Rule_Zeittest_0Eval0Invoker.java:19)<br> ... 21 more<br>
<br><br>The rule that is causing this goes like this:<br>rule "Zeittest"<br> when<br> room : Room ( )<br> uhr : AlarmClock( applianceStateResource == ApplianceStateEnum.on,<br>
location == room, $alarmTime : alarmTime )<br> eval( $alarmTime.getHours() > 10 )<br> then<br>...<br><br>If I omit the eval, ths error will not occur (and I can access<br>$alarmTime.getHours() in RHS)
<br>I wonder if I do something wrong or if it is a Drools bug.<br><br>Any hints ?<br><br><br>--<br>View this message in context: <a href="http://www.nabble.com/Drools-bug----%283.0.6%29-tf3715030.html#a10392045">http://www.nabble.com/Drools-bug----%283.0.6%29-tf3715030.html#a10392045
</a><br>Sent from the drools - user mailing list archive at <a href="http://Nabble.com">Nabble.com</a>.<br><br>_______________________________________________<br>rules-users mailing list<br><a href="mailto:rules-users@lists.jboss.org">
rules-users@lists.jboss.org</a><br><a href="https://lists.jboss.org/mailman/listinfo/rules-users">https://lists.jboss.org/mailman/listinfo/rules-users</a><br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli
<br> Software Engineer - JBoss Rules Core Developer<br> Office: +55 11 3529-6000<br> Mobile: +55 11 9287-5646<br> JBoss, a division of Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a>