<br> Krishnan,<br><br> By the line:<br><br>
INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0.returnValue0(Rule_Cisco_Systems_0.java:14)<br><br> We can "decipher the trace" :) and know that the NPE is raised in the rule "Rule Cisco Systems", in the first return value predicate. Not the rule you pasted in your e-mail.
<br><br> []s<br> Edson<br><br><div><span class="gmail_quote">2007/9/18, Krishnan <<a href="mailto:krishiyer@gmail.com">krishiyer@gmail.com</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>Hi, <br><br>Thanks for your help as always. I did look at it a little more closer. <br><br>The caused error is as follows :- <br><br>INFO | jvm 1 | 2007/09/14 16:46:33 | Caused by: java.lang.NullPointerException<br>
INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0.returnValue0(Rule_Cisco_Systems_0.java:14)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0ReturnValue0Invoker.evaluate
(Rule_Cisco_Systems_0ReturnValue0Invoker.java:19)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:191)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | ... 28 more
<br>INFO | jvm 1 | 2007/09/14 16:46:33 | org.drools.spi.ConsequenceException: org.drools.RuntimeDroolsException: Exception executing predicate com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0ReturnValue0Invoker@39d31fda
<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:549)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java
:509)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:430)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.fireAllRules
(AbstractWorkingMemory.java:392)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.SnmpVendorBehaviourDetermination.determineVendorType(SnmpVendorBehaviourDetermination.java:45)
<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.DNPIACTask.vendorTypeRuleSNMP(DNPIACTask.java:487)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.DNPIACTask.determineVendorTypeFromSNMP
(DNPIACTask.java:512)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.DNPIACTask.determineVendorType(DNPIACTask.java:556)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.DNPIACTask.processNode
(DNPIACTask.java:262)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.fs.is.dnpiac.DNPIACTask.performTask(DNPIACTask.java:171)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.common.utilities.threads.ServiceThread.service
(ServiceThread.java:187)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.common.utilities.threads.ServiceThread.runTask(ServiceThread.java:233)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at com.makesys.common.utilities.threads.DisposableServiceThread.run
(DisposableServiceThread.java:126)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at java.lang.Thread.run(Unknown Source)<br><br>Based on the above I realized that it is complaining about a NPE. Not sure, if it is happening in the lhs or rhs ?.
<br><br>Is there something that tells you where this happens. I least think I have a couple of things to try out.<br><br>-Krishnan<br><br>rule "Generate Cisco object"<br> salience 100<br> when <br> eval (vendorObj != null)
<br> eval (SnmpHelper.getSysObjectId(vendorObj.getPing()).matches(".*\\.1\\.3\\.6\\.1\\.4\\.1\\.9.*"))<br> then <br> CiscoBaseObject baseObj = new CiscoBaseObject();<br> baseObj.initialize(vendorObj.getPing(),
vendorObj.getDp(), vendorObj.getNodeInfo());<br> insert(baseObj);<br> end<div><span class="e" id="q_11519f620eb9208a_1"><br><br><br><div><span class="gmail_quote">On 9/18/07, <b class="gmail_sendername">Edson Tirelli</b>
<<a href="mailto:tirelli@post.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">tirelli@post.com
</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<br> Krushnan,<br><br> Isn't there a "cause by" down the stack trace? Current code for raising the exception is:<br><br> try {<br> return this.expression.evaluate( object,<br> null,
<br> this.previousDeclarations,<br> this.localDeclarations,<br> workingMemory );<br> } catch ( final Exception e ) {
<br> throw new RuntimeDroolsException( "Exception executing predicate " + this.expression,<br> e );<br> }<br><br> All we can say for sure from the exception stack trace snippet you provided is that it was raised in a rule named "Rule Cisco Systems", in the first return value predicate.
<br> We need to improve that a bit I think.<br><br> []s<br> Edson <br><br><div><span class="gmail_quote">2007/9/18, Krishnan <<a href="mailto:krishiyer@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
krishiyer@gmail.com</a>>:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div><span><br>Hi all, <br><br>When exceptions occur during runtime of drools, is there a list of things to see to understand what may be causing <br>this to happen ? I know it is a very generic question. I want to see if there is a methodical way to understand what
<br>to look for ?. <br><br>org.drools.RuntimeDroolsException: Exception executing predicate com.makesys.fs.is.dnpiac.vendorBehaviour.snmp.Rule_Cisco_Systems_0ReturnValue0Invoker@39d31fda<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at
org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:197)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:122)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at
org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:317)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:130)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at
org.drools.reteoo.SingleObjectSinkAdapter.propagateAssertObject(SingleObjectSinkAdapter.java:20)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ObjectTypeNode.assertObject(ObjectTypeNode.java:168)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at
org.drools.reteoo.Rete.assertObject(Rete.java:168)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ReteooRuleBase.assertObject(ReteooRuleBase.java:190)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.reteoo.ReteooWorkingMemory.doInsert
(ReteooWorkingMemory.java:70)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:848)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.common.AbstractWorkingMemory.insert
(AbstractWorkingMemory.java:822)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.base.DefaultKnowledgeHelper.insert(DefaultKnowledgeHelper.java:60)<br>INFO | jvm 1 | 2007/09/14 16:46:33 | at org.drools.base.DefaultKnowledgeHelper.insert
(DefaultKnowledgeHelper.java:54)<br><br>Any help is appreciated ?<br><br>thanks, <br>Krishnan. <br clear="all"><span><br>-- <br>Sivaramakrishna Iyer Krishnan (Anand) <br><br>Never assume the obvious is true. <br> - William Safire
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<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" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
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<br><br clear="all"><br>-- <br>Sivaramakrishna Iyer Krishnan (Anand) <br><br>Never assume the obvious is true. <br>- William Safire
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<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>