<br> It must be after serialization. I guess you might also be using interfaces (or superclasses) as patterns in the rules and inserting the implementations (or subclasses) as facts?<br><br> This obviously should not be a problem, but I hope the above helps you narrow down the scenario. <br>
<br> Thanks,<br> Edson<br><br><div class="gmail_quote">2009/10/20 Nicholas Hemley <span dir="ltr"><<a href="mailto:nic.hemley@sidonis.com">nic.hemley@sidonis.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="EN-GB">
<div>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Edson,</span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);">Many thanks for this: yes, we do use serialization so I will try
and identify the exact case where this error happens.</span></p><div class="im">
<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas; color: rgb(31, 73, 125);">Cheerio,</span></p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas; color: rgb(31, 73, 125);">Nic</span></p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Nicholas Hemley</span></b></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Senior Developer</span></b></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Sidonis | Powering a New Generation of Service Assurance</span></b><span style="font-size: 8pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);"> </span></b></p>
</div><p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">e: </span></b><span style="font-size: 8pt; color: rgb(31, 73, 125);"><a href="mailto:carol.hopperton@sidonis.com" target="_blank">nic.hemley@sidonis.com</a><b></b></span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">m: </span></b><span style="font-size: 8pt; color: rgb(31, 73, 125);">+44 (0)7956 695 037</span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">t: </span></b><span style="font-size: 8pt; color: rgb(31, 73, 125);">+44 (0)1225 446060</span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">skype: nicholas.hemley</span></b><span style="font-size: 8pt; color: rgb(31, 73, 125);"></span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">w: <a href="http://www.sidonis.com/" target="_blank">www.sidonis.com</a></span></b></p>
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<p class="MsoNormal"><span style="font-size: 11pt; color: rgb(31, 73, 125);"> </span></p>
<p class="MsoNormal"><span style="font-size: 8pt; color: rgb(15, 36, 62);">Sidonis Limited. Registered No: 5718402. Registered
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<p class="MsoNormal"><b><span style="font-size: 10pt;" lang="EN-US">From:</span></b><span style="font-size: 10pt;" lang="EN-US"> <a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a>
[mailto:<a href="mailto:rules-users-bounces@lists.jboss.org" target="_blank">rules-users-bounces@lists.jboss.org</a>] <b>On Behalf Of </b>Edson Tirelli<br>
<b>Sent:</b> 20 October 2009 15:18<br>
<b>To:</b> Rules Users List<br>
<b>Subject:</b> Re: [rules-users] ClassCastException -
org.drools.reteoo.BetaMemory</span></p>
</div><div><div></div><div class="h5">
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
This is a bug. Would you please open a JIRA and attach as
much information about the scenario as you can? A test case would be ideal,
even if the problem does not happen every single run. Also, are you using
serialization in your application? <br>
<br>
Edson</p>
<div>
<p class="MsoNormal">2009/10/20 Nicholas Hemley <<a href="mailto:nic.hemley@sidonis.com" target="_blank">nic.hemley@sidonis.com</a>></p>
<div>
<div>
<p class="MsoNormal">Hello,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I
am getting the following intermittent error from drools 5.0.1 when removing a
knowledge package from a knowledge base:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">org.drools.reteoo.BetaMemory
cannot be cast to org.drools.reteoo.RuleTerminalNode$TerminalNodeMemory</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I
iterate over knowledgeBase.getKnowledgePackages() and the error occurs, but
only occasionally.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The
full trace is as follows:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">java.lang.ClassCastException:
org.drools.reteoo.BetaMemory cannot be cast to
org.drools.reteoo.RuleTerminalNode$TerminalNodeMemory</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.reteoo.RuleTerminalNode.doRemove(RuleTerminalNode.java:357)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.common.BaseNode.remove(BaseNode.java:95)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.reteoo.ReteooBuilder.removeRule(ReteooBuilder.java:237)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.reteoo.ReteooRuleBase.removeRule(ReteooRuleBase.java:366)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.common.AbstractRuleBase.removeRule(AbstractRuleBase.java:712)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.common.AbstractRuleBase.removePackage(AbstractRuleBase.java:640)</span></p>
<p class="MsoNormal"><span style="font-size: 10pt; font-family: "Courier New"; color: rgb(63, 127, 95);">at
org.drools.impl.KnowledgeBaseImpl.removeKnowledgePackage(KnowledgeBaseImpl.java:166)</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Any
ideas why this would potentially happen?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas;">Cheerio,</span></p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas;">Nic</span></p>
<p class="MsoNormal"><span style="font-size: 10.5pt; font-family: Consolas;"> </span></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Nicholas Hemley</span></b></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Senior Developer</span></b></p>
<p class="MsoNormal"><b><span style="font-size: 8pt; color: rgb(31, 73, 125);">Sidonis | Powering a New Generation of
Service Assurance</span></b></p>
</div>
</div>
<p class="MsoNormal" style="margin-bottom: 12pt;"><br>
_______________________________________________<br>
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</div>
<p class="MsoNormal"><br>
<br clear="all">
<br>
-- <br>
Edson Tirelli<br>
JBoss Drools Core Development<br>
JBoss by Red Hat @ <a href="http://www.jboss.com" target="_blank">www.jboss.com</a></p>
</div></div></div>
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<br></blockquote></div><br><br clear="all"><br>-- <br> Edson Tirelli<br> JBoss Drools Core Development<br> JBoss by Red Hat @ <a href="http://www.jboss.com">www.jboss.com</a><br>