[rules-users] KnowledgeAgent exception while trying to deserialize KnowledgeDefinitionsPackage

[John Peterson]

I upgraded Guvnor on the JBoss server by replacing the 5.0.1
drools-guvnor.war in /server/default/deploy with the drools-guvnor.war
for 5.1.1.  Once we restarted the server, everything seemed to be
working fine with the 5.1.1 features.  It wasn't until a couple weeks
later when we tried to connect that we started getting the failure
messages.  The package in question is new since the upgrade.

How do I re-compile/re-package the binaries?  I'm assuming this is
different from doing a "Save and validate configuration" or "Build
package" on the package screen.

Thanks and a Happy New Year to you as well!

John

Message: 2
Date: Tue, 4 Jan 2011 16:56:52 +0000
From: Michael Anstis <michael.anstis at gmail.com>
Subject: Re: [rules-users] KnowledgeAgent exception while trying to
	deserialize KnowledgeDefinitionsPackage
To: Rules Users List <rules-users at lists.jboss.org>
Message-ID:
	<AANLkTiktBPpALU68Ptbha=gVQ7OYDeMs1Eee+u+TmbFj at mail.gmail.com>
Content-Type: text/plain; charset="windows-1252"

Hi John,

AFAIK you need both client (i.e. your IDE) and server versions of Guvnor
to be the same.

If you are trying to load a package from an existing (5.0.1) Guvnor
repositoty I believe you will need to re-compile\re-package the binaries
as a number of SerialVersionIds changed.

It wasn't clear from your email whether this is what you have set-up.

Happy New Year!

Mike

2011/1/4 John Peterson <john.peterson.gv3k at statefarm.com>

>  This is sort of a repost of an error I?ve been getting, but I thought

> with the new year, I?d give it another shot.
>
> I?ve been getting the following exception in my code:
>
> [2010:12:361 09:12:910:debug] KnowledgeAgent rebuilding KnowledgeBase 
> using ChangeSet
>
> [2010:12:361 09:12:972:exception]
>
> ***java.lang.RuntimeException*: KnowledgeAgent exception while trying 
> to deserialize KnowledgeDefinitionsPackage
>
>   
> atorg.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(*
> **
> KnowledgeAgentImpl.java:664*)
>
>   
> atorg.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase
> (*
> **KnowledgeAgentImpl.java:889*)
>
>   at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(***
> KnowledgeAgentImpl.java:704*)
>
>   at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(***
> KnowledgeAgentImpl.java:584*)
>
>   at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(***
> KnowledgeAgentImpl.java:185*)
>
>   at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(***
> KnowledgeAgentImpl.java:168*)
>
>   at com.agencyawards2.RuleSessionProviderFactory.getSessionFactory(
> ***RuleSessionProviderFactory.java:95*)
>
>   at com.agencyawards2.RuleSessionProviderFactory.getProvider(***
> RuleSessionProviderFactory.java:35*)
>
>   at com.agencyawards2.RunRules.runRules(***RunRules.java:27*)
>
>   at com.agencyawards2.DroolsTest.main(***DroolsTest.java:40*)
>
> Caused by:*** java.io.StreamCorruptedException*: invalid stream 
> header:7061636B
>
>   at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
>
>   at java.io.ObjectInputStream.<init>(Unknown Source)
>
>   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*)
>
>   
> atorg.drools.agent.impl.KnowledgeAgentImpl.createPackageFromResource(*
> **
> KnowledgeAgentImpl.java:653*)
>
>   ... 9 more
>
> I?m running Drools 5.1.1 on my workstation in Eclipse.  When I run it 
> against Guvnor locally using version 5.1.1 installed as the ?Guvnor 
> Standalone? downloaded at the same time as Drools 5.1.1 was
downloadedfrom the JBoss.org site, it works fine.
>
> When I run it against the server, which was from the 5.0.1 ?Guvnor 
> Standalone? installation, but I updated the drools-guvnor.war file to 
> use the new 5.1.1 version, I get the error listed above.  Based on my 
> research into the ?KnowledgeAgent exception while trying to 
> deserialize KnowledgeDefinitionsPackage? error, it seems to stem from 
> an incompatibility between versions of Drools.
>
> Do I need to install the 5.1.1 Guvnor Standalone to my server to bring

> the versions into synch, or am I experiencing some other sort of
problem?
>
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
>
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