[rules-users] KnowledgeAgent exception

[Claus Straube]

Hi Wolfgang,

that helps. So the mistake was to place drl files in my folder. I'll try 
to marshall my drl files to a brl file. Thanks.

Best regards - Claus

On 01.02.2011 18:48, Wolfgang Laun wrote:
> The exception is thrown by an ObjectInputStream because the file 
> begins with
> 7061636B
> which appears to be "pack" and indicates that a .drl (DRL source) is 
> accessed instead of a .brl. (precompiled package).
>
> -W
>
>
>
>
> On 1 February 2011 18:34, Claus Straube <claus.straube at catify.com 
> <mailto:claus.straube at catify.com>> wrote:
>
>     Hi all,
>
>     I'm trying to use the resource scanner in my application (drools
>     5.1.1,
>     also tried in 5.2.0-SNAPSHOT):
>
>     --snip--
>             //resource scanner
>             KnowledgeAgent kagent =
>     KnowledgeAgentFactory.newKnowledgeAgent( "MyAgent" );
>             kagent.applyChangeSet(
>     ResourceFactory.newByteArrayResource(this.getChangeConfiguration()) );
>             KnowledgeBase kbase = kagent.getKnowledgeBase();
>
>             this.ksession = kbase.newStatefulKnowledgeSession();
>     --snip--
>
>     and getting always a 'KnowledgeAgent exception while trying to
>     deserialize KnowledgeDefinitionsPackage' (see stacktrace below). Of
>     course I've googled for the problem and found that it was in 5.0.1 a
>     incompatibility problem between drools expert and guvner. But I'm not
>     using guvnor at all. I want to place some *.drl files in a
>     directory and
>     run an agent that automatically updates my knowledge base. The agent
>     finds the directory and the files, but has problems to deserialize
>     them.
>     If I'm loading them directly into the knowledge base they will
>     work fine.
>
>     Any hints to find a solution are welcome.
>
>     Best regards - Claus
>
>
>     -----
>     java.lang.RuntimeException: KnowledgeAgent exception while trying to
>     deserialize KnowledgeDefinitionsPackage
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:732)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:965)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:774)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:646)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:172)
>         at
>     com.catify.core.process.routers.DecisionRouter.<init>(DecisionRouter.java:32)
>         at
>     com.catify.core.rest.TestDecisionRouter.testRouting(TestDecisionRouter.java:27)
>         at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
>         at
>     sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
>         at
>     sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>         at java.lang.reflect.Method.invoke(Method.java:616)
>         at junit.framework.TestCase.runTest(TestCase.java:168)
>         at junit.framework.TestCase.runBare(TestCase.java:134)
>         at org.apache.camel.test.TestSupport.runBare(TestSupport.java:65)
>         at junit.framework.TestResult$1.protect(TestResult.java:110)
>         at junit.framework.TestResult.runProtected(TestResult.java:128)
>         at junit.framework.TestResult.run(TestResult.java:113)
>         at junit.framework.TestCase.run(TestCase.java:124)
>         at junit.framework.TestSuite.runTest(TestSuite.java:232)
>         at junit.framework.TestSuite.run(TestSuite.java:227)
>         at
>     org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:83)
>         at
>     org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:46)
>         at
>     org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
>         at
>     org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
>         at
>     org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
>         at
>     org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
>         at
>     org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
>     Caused by: java.io.StreamCorruptedException: invalid stream
>     header: 7061636B
>         at
>     java.io.ObjectInputStream.readStreamHeader(ObjectInputStream.java:800)
>         at java.io.ObjectInputStream.<init>(ObjectInputStream.java:297)
>         at
>     org.drools.common.DroolsObjectInputStream.<init>(DroolsObjectInputStream.java:71)
>         at
>     org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:205)
>         at
>     org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:174)
>         at
>     org.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(KnowledgeAgentImpl.java:721)
>         ... 27 more
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