[rules-users] KnowledgeAgent exception

[Wolfgang Laun]

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> 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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