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<p class="MsoNormal"><span style="color:#1F497D">@David- thanks for your reply.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">In the patch, we have applied synchronise block, we referred to 6.0.0 release.</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Still it’s throwing LinkageError for the same,
</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
<p class="MsoNormal"><span style="color:#1F497D">Regards,</span></p>
<p class="MsoNormal"><span style="color:#1F497D">Karan</span></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span></p>
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<p class="MsoNormal"><b><span lang="EN-US" style="color:windowtext">From:</span></b><span lang="EN-US" style="color:windowtext"> rules-users-bounces@lists.jboss.org [mailto:rules-users-bounces@lists.jboss.org]
<b>On Behalf Of </b>Davide Sottara<br>
<b>Sent:</b> 05 April 2014 12:19<br>
<b>To:</b> rules-users@lists.jboss.org<br>
<b>Subject:</b> Re: [rules-users] Linkage Error In execute method</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">Can you upgrade to 5.6?<br>
Otherwise, you'll have to synchronize the methods int ClassLoader, the null check is not enough<br>
<br>
On 04/04/2014 09:16 PM, Karan Malhotra wrote:<span style="font-size:12.0pt"></span></p>
</div>
<blockquote style="margin-top:5.0pt; margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi All,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">We have recently upgraded our application from 5.1.0 to 5.4.0.Final.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Everything worked well until this was deployed at Production Envr. We started getting multiple Linkage Error in execute method of Stateless KnowledgeSession.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">StackTrace:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Exception: java.util.concurrent.ExecutionException: java.lang.LinkageError: loader (instance oforg/drools/rule/JavaDialectRuntimeData$PackageClassLoader): attemptedduplicate class definition for name: "OffBarCapping/Rule_Off_Bar_Tariff_Capping_13_2a4a909def69414bbd60cdfdac9ad807"|</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">OffBarCapping/Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1f# at OffBarCapping.Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1fPredicate0InvokerGenerated.evaluate(Unknown Source)# at OffBarCapping.Rule_Off_Bar_Tariff_Capping_16_6b6f1282708449448fc434e820fa8e1fPredicate0Invoker.evaluate(Unknown
Source)# at org.drools.rule.PredicateConstraint.isAllowed(PredicateConstraint.java:299)# at org.drools.reteoo.AlphaNode.assertObject(AlphaNode.java:137)# at org.drools.reteoo.CompositeObjectSinkAdapter.doPropagateAssertObject(CompositeObjectSinkAdapter.java:497)#
at org.drools.reteoo.CompositeObjectSinkAdapter.propagateAssertObject(CompositeObjectSinkAdapter.java:382)# 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:337)# at org.drools.common.NamedEntryPoint.insert(NamedEntryPoint.java:298)# at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:888)# at org.drools.common.AbstractWorkingMemory.insert(AbstractWorkingMemory.java:847)#
at org.drools.impl.StatefulKnowledgeSessionImpl.insert(StatefulKnowledgeSessionImpl.java:269)# at org.drools.impl.StatelessKnowledgeSessionImpl.execute(StatelessKnowledgeSessionImpl.java:294)#</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style="text-indent:-18.0pt; line-height:15.0pt; background:whitesmoke">
<span style="font-size:10.5pt; font-family:"Arial","sans-serif"; color:#333333">1.</span><span style="font-size:7.0pt; font-family:"Times New Roman","serif"; color:#333333">
</span>Some surfing on the internet referred us to a similar JIRA issue:- <span style="font-size:10.5pt; font-family:"Arial","sans-serif"; color:#333333">
<a href="https://issues.jboss.org/browse/JBRULES-3675"><span style="color:#333333; text-decoration:none">JBRULES-3675</span></a></span></p>
<p class="MsoNormal">It says this has been fixed in 6.0.0. We were not in a position to upgrade to 6.0.0 right away and hence decide to apply a patch in drools-core-5.4.0.Final.jar</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Drools: 5.4.0</p>
<p class="MsoNormal">public Class<?> More ...fastFindClass( final String name ) {</p>
<p class="MsoNormal"> Class<?> cls = findLoadedClass( name );</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> if (cls == null) {</p>
<p class="MsoNormal"> final byte[] clazzBytes = this.store.read( convertClassToResourcePath( name ) );</p>
<p class="MsoNormal"> if (clazzBytes != null) {</p>
<p class="MsoNormal"> String pkgName = name.substring( 0,</p>
<p class="MsoNormal"> name.lastIndexOf( '.' ) );</p>
<p class="MsoNormal"> if (getPackage( pkgName ) == null) {</p>
<p class="MsoNormal"> definePackage( pkgName,</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> "",</p>
<p class="MsoNormal"> null );</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> cls = defineClass( name,</p>
<p class="MsoNormal"> clazzBytes,</p>
<p class="MsoNormal"> 0,</p>
<p class="MsoNormal"> clazzBytes.length,</p>
<p class="MsoNormal"> PROTECTION_DOMAIN );</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> if (cls != null) {</p>
<p class="MsoNormal"> resolveClass( cls );</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> return cls;</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Path applied:- </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">public Class fastFindClass(String name)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> Class cls = findLoadedClass(name);</p>
<p class="MsoNormal"> if(cls == null)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> byte clazzBytes[] = store.read(JavaDialectRuntimeData.convertClassToResourcePath(name));</p>
<p class="MsoNormal"> if(clazzBytes != null)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> String pkgName = name.substring(0, name.lastIndexOf('.'));</p>
<p class="MsoNormal"> if(!existingPackages.contains(pkgName))</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> <b>synchronized(this)</b></p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> if(!existingPackages.contains(pkgName))</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> if(getPackage(pkgName) == null)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> definePackage(pkgName, "", "", "", "", "", "", null);</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> existingPackages.add(pkgName);</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> cls = defineClass(name, clazzBytes, 0, clazzBytes.length, JavaDialectRuntimeData.access$000());</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> if(cls != null)</p>
<p class="MsoNormal"> {</p>
<p class="MsoNormal"> resolveClass(cls);</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> return cls;</p>
<p class="MsoNormal"> }</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">But we are still getting this Error.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Let me know if any one did face a similar issue and solution for the same.</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks and regards,</p>
<p class="MsoNormal">Karan Malhotra</p>
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<br>
<br>
</span></p>
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