[rules-users] KnowledgeAgent exception while trying to deserialize

[John Peterson]

Mike,

I believe this is the first time we've tried running anything from
workstation to server.  Essentially what happened was that I did the
upgrade of the drools-guvnor.war file and then we fired up the server
following the upgrade.  I checked out the server environment to see that
it was using the new version of Guvnor (i.e. new features, like
reporting, etc.) and it checked out fine.  I turned it over to my
business partners to start building a new rule app.

I installed the new Guvnor-standalone to my workstation (based on 5.1.1)
and then started building a java application.  I used the local copy to
with some dummy rules to verify that my eclipse app was talking to the
local server correctly, which it was.  It wasn't until about 2 weeks ago
we tried to switch my eclipse app to talk to the new Guvnor app built by
the business partners that we started seeing the problem.  Since we were
working with a new app, post-update, we never tried to connect prior to
the update.

The specific error - "KnowledgeAgent exception while trying to
deserialize KnowledgeDefinitionsPackage" - seems to imply an
incompatibility between Drools in eclipse and Guvnor from what I've
gathered from Google, mailing lists, etc.  It is this issue that is
leading towards the idea of just exporting the repository, installing
the .zip of the Guvnor-standalone I used for my workstation locally to
the server, and then importing the repository.

I hope that helps answer your questions.  Thanks for your help so
far....

John


Message: 5
Date: Wed, 5 Jan 2011 14:48:43 +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:
	<AANLkTi=LDDG00Vd98ebetparyRa+sdO-jACkmL9hv4Ox at mail.gmail.com>
Content-Type: text/plain; charset="iso-8859-1"

Hi John,

Hmmm.... one of these types of problem. Nice.

Firstly, the "re-compile\re-package" malarkey is the same as "Build
package"
on the package information screen (or whatever we want to call that
too!)

I am suspicious that something somewhere else has not caused the
problem: If
Guvnor 5.1.1 (presumably) worked OK for a couple of weeks following the
upgrade.....

Was this the first new package created with 5.1.1? Has the server been
restored for some reason (to a backup with 5.0.1)? Have any new packages
been successful?

Thanks,

Mike

On 4 January 2011 18:12, John Peterson
<john.peterson.gv3k at statefarm.com>wrote:

> 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<gVQ7OYDeMs
1Eee%2Bu%2BTmbFj 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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