[rules-users] Problems using Packages from BRMS (urls, serialization, enums..)

Thu Aug 23 11:02:35 EDT 2007

Well, the BRMS is tricky because it doesnt have good error report   
and it is very strict on dependencies...

What I did to resolve my problems was check every import and class  
used in my model. For example I had to
re-check the libraries used on my model (like joda-time which I had  
to include in the model jar imported into the
BRMS package). Also I was very careful checking the "import <class>"  
declaration on the BRMS's package config.

Also check that the mvel jar is the same in the BRMS and your test  
classpath. (this was all the problem in the readPackage and
serialization problem). BRMS needs to throw better error messages I  
think, because this errors are very usual.

That solved my problem.

Thanks and good luck!

On 21-08-2007, at 12:18, Felipe Piccolini wrote:

> Hi,
>
> Im trying to test the RuleAgent to get a pkg from BRMS (url) but it  
> cant load the pkg (which was succesfuly
> created) from the snapshot url given by BRMS. If I try to connect  
> to that URL I inmediatly get the pkg to download...
>
> Tryed to debug but I stoped at
> DroolsObjectInputStream oin = new DroolsObjectInputStream(in);
>                 return (Package) oin.readObject();
>
> at HttpClientImpl.java... the readObject() fails from  
> ObjectInputStream.
>
> Here is the stacktrace....
>
> RuleAgent(testSolcredProfesion) INFO (Tue Aug 21 10:12:02 CLT  
> 2007): Configuring with newInstance=true, secondsToRefresh=30
> RuleAgent(testSolcredProfesion) INFO (Tue Aug 21 10:12:06 CLT  
> 2007): Configuring package provider : URLScanner monitoring URLs:   
> http://localhost:8080/drools-jbrms/org.drools.brms.JBRMS/package/ 
> cl.bluesoft.test/test_1.0 with local cache dir of /tmp/drools
> RuleAgent(testSolcredProfesion) WARNING (Tue Aug 21 10:12:08 CLT  
> 2007): Falling back to local cache.
> java.lang.NullPointerException
> 	at org.drools.agent.FileScanner.readPackage(FileScanner.java:101)
> 	at org.drools.agent.FileScanner.getChangeSet(FileScanner.java:79)
> 	at org.drools.agent.FileScanner.loadPackageChanges 
> (FileScanner.java:57)
> 	at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:93)
> 	at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:297)
> 	at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:265)
> 	at org.drools.agent.RuleAgent.configure(RuleAgent.java:251)
> 	at org.drools.agent.RuleAgent.init(RuleAgent.java:183)
> 	at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:140)
> 	at cl.bluesoft.drools.api.RulesFactory.addRules(RulesFactory.java: 
> 149)
> 	at cl.bluesoft.test.TestBRMS.main(TestBRMS.java:36)
>
> -------
> Also downloaded the pakage from the BRMS and used simple  
> BinaryRuleBaseLoader:
>
> BinaryRuleBaseLoader loader = new BinaryRuleBaseLoader(ruleBase);
> 	    loader.addPackage( CONTEXT_CLASS_LOADER.getResourceAsStream 
> ( binaryPackageFilePath ) );
>
> but I have a problem with serialization... my first thought was  
> about different mvel jars, replaced mvel jar in my classpath with  
> the one in BRMS war, but
> the problem is still there... Im using Enum clases (enum types from  
> 1.5), maybe this is the problem?... because I cant set the  
> serialVersionID in enums.
>
> org.drools.RuntimeDroolsException: java.io.InvalidClassException:  
> org.mvel.CompiledExpression; local class incompatible: stream  
> classdesc serialVersionUID = -8459552198577984707, local class  
> serialVersionUID = -1994048675652702021
> 	at org.drools.util.BinaryRuleBaseLoader.addPackage 
> (BinaryRuleBaseLoader.java:100)
> 	at org.drools.util.BinaryRuleBaseLoader.addPackage 
> (BinaryRuleBaseLoader.java:67)
> 	at cl.bluesoft.drools.api.RulesFactory.addRulesBinPkg 
> (RulesFactory.java:105)
> 	at cl.bluesoft.solcred.TestSolcredProfesionBinPkg.main 
> (TestSolcredProfesionBinPkg.java:35)
> Caused by: java.io.InvalidClassException:  
> org.mvel.CompiledExpression; local class incompatible: stream  
> classdesc serialVersionUID = -8459552198577984707, local class  
> serialVersionUID = -1994048675652702021
> 	at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:546)
> 	at java.io.ObjectInputStream.readNonProxyDesc 
> (ObjectInputStream.java:1552)
> 	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java: 
> 1466)
> 	at java.io.ObjectInputStream.readOrdinaryObject 
> (ObjectInputStream.java:1699)
> 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
> 	at java.io.ObjectInputStream.defaultReadFields 
> (ObjectInputStream.java:1908)
> 	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
> 1832)
> 	at java.io.ObjectInputStream.readOrdinaryObject 
> (ObjectInputStream.java:1719)
> 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
> 	at java.io.ObjectInputStream.defaultReadFields 
> (ObjectInputStream.java:1908)
> 	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
> 1832)
> 	at java.io.ObjectInputStream.readOrdinaryObject 
> (ObjectInputStream.java:1719)
> 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
> 	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
> 	at java.util.HashMap.readObject(HashMap.java:1013)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> 	at sun.reflect.NativeMethodAccessorImpl.invoke 
> (NativeMethodAccessorImpl.java:39)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke 
> (DelegatingMethodAccessorImpl.java:25)
> 	at java.lang.reflect.Method.invoke(Method.java:585)
> 	at java.io.ObjectStreamClass.invokeReadObject 
> (ObjectStreamClass.java:946)
> 	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java: 
> 1809)
> 	at java.io.ObjectInputStream.readOrdinaryObject 
> (ObjectInputStream.java:1719)
> 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
> 	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
> 	at org.drools.rule.Package.readExternal(Package.java:184)
> 	at java.io.ObjectInputStream.readExternalData 
> (ObjectInputStream.java:1755)
> 	at java.io.ObjectInputStream.readOrdinaryObject 
> (ObjectInputStream.java:1717)
> 	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1305)
> 	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
> 	at org.drools.util.BinaryRuleBaseLoader.addPackage 
> (BinaryRuleBaseLoader.java:82)
> 	... 3 more
>
> Thanks for help... I really need to use enums in my model...  :)
>
>
>
> Felipe Piccolini M.
> felipe.piccolini at bluesoft.cl
>
>
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users

Atentamente,
______________________
Felipe Piccolini Marfull
Jefe de Proyectos
Agustina 1141 Piso 8-B
Santiago

Fono    +(56 2) 68830837
E-mail felipe.piccolini at bluesoft.cl

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