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<p class="MsoNormal">I'm not very experienced with Drools but have some Java code that dynamically loads/unloads rules from a KnowledgeBase. It worked with 5.2 but now throws the following exception with 5.3<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">org.drools.RuntimeDroolsException: Unable to merge resource attribute for type declaration of class: 'NormalizedEvent'<o:p></o:p></p>
<p class="MsoNormal"> at org.drools.common.AbstractRuleBase.mergeLeft(AbstractRuleBase.java:642)<o:p></o:p></p>
<p class="MsoNormal"> at org.drools.common.AbstractRuleBase.mergeTypeDeclarations(AbstractRuleBase.java:608)<o:p></o:p></p>
<p class="MsoNormal"> at org.drools.common.AbstractRuleBase.addPackages(AbstractRuleBase.java:537)<o:p></o:p></p>
<p class="MsoNormal"> at org.drools.reteoo.ReteooRuleBase.addPackages(ReteooRuleBase.java:458)<o:p></o:p></p>
<p class="MsoNormal"> at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:150)<o:p></o:p></p>
<p class="MsoNormal"> at com.hp.mon.processor.KnowledgeSessionFactory.addRules(KnowledgeSessionFactory.java:181)<o:p></o:p></p>
<p class="MsoNormal"> at com.hp.mon.processor.RuleRunner.runRules(RuleRunner.java:54)
<o:p></o:p></p>
<p class="MsoNormal"> at com.hp.mon.processor.RulesTest.test(RulesTest.java:57)
<o:p></o:p></p>
<p class="MsoNormal"> at com.hp.mon.processor.RulesTest.testSiteScopeSNMPRules(RulesTest.java:85)<o:p></o:p></p>
<p class="MsoNormal"> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
<o:p></o:p></p>
<p class="MsoNormal"> at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
<o:p></o:p></p>
<p class="MsoNormal"> at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
<o:p></o:p></p>
<p class="MsoNormal"> at java.lang.reflect.Method.invoke(Unknown Source) <o:p>
</o:p></p>
<p class="MsoNormal"> at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:31)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
<o:p></o:p></p>
<p class="MsoNormal"> at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)<o:p></o:p></p>
<p class="MsoNormal"> at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I have three .drl files. The first is "globals.drl" that simply imports and defines some global variables (e.g, a org.slf4j.Logger, etc.). This globals.drl file also defines NormalizedEvent as follows:<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">declare NormalizedEvent <o:p></o:p></p>
<p class="MsoNormal"> @role( event ) <o:p></o:p></p>
<p class="MsoNormal">end <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">The second rules file (defaultRules.drl) contains default rules for aging out old / stale events.<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">The third rules file has rules additional rules that are specific to a policy being dynamically deployed to our application.<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">The compilation and loading process treats "globals.drl" as common "header" file. That is, rules files are pre-pended with globals.drl before they are compiled. For example:<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal"> String globals = readDrlfile("globals.drl"); <o:p></o:p></p>
<p class="MsoNormal"> String newRules = readDrlfile("rulesToAdd.drl"); <o:p></o:p></p>
<p class="MsoNormal"> knowledgeBuilder.add(ResourceFactory.newReaderResource(new StringReader(globals + newRules)));<o:p></o:p></p>
<p class="MsoNormal"> if (knowledgeBuilder.hasErrors()) { <o:p></o:p></p>
<p class="MsoNormal"> throw exception ... <o:p></o:p></p>
<p class="MsoNormal"> } <o:p></o:p></p>
<p class="MsoNormal"> // No exception so compile succeeded --- BTW, it's using JANINO
<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> knowledgeBase.addKnowledgePackages(knowledgeBuilder.getKnowledgePackages()); // ERROR<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">The first compile and load (globals.drl + defaultRules.drl) succeeds but I get this exception when I try to compile and load an additional file (globals.drl + additionalRules.drl).<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">This code was also written by someone not very familar with Drools but it was working in 5.2 and now I need to get it working with 5.3 Looks like there were some significant code changes to AbstractRuleBase between these two releases.<o:p></o:p></p>
<p class="MsoNormal"><o:p></o:p></p>
<p class="MsoNormal">Any thoughts or suggestion here would be greatly appreciated.<o:p></o:p></p>
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