[rules-users] Help needed

[Mattias Nilsson Grip]

prasad.pbc wrote:
> 
> Hi Guys,
>   Iam using Eclipse tool for writing drl , i have written drl .
> Then i have written an ant script to convert this drl to PKG .
> i have used drools5.1.1.jars. i was sucessfully convert drl to pkg.
> 
> knowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); 
>                 kbuilder.add( ResourceFactory.newFileResource(
> "c:/Sample.pkg" ), 
>                                 ResourceType.PKG ); 
> iam getting below error:
> 
> java.lang.ClassCastException: org.drools.reteoo.ReteooRuleBase cannot be
> cast to org.drools.rule.Package
>         at
> org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:487)
>         at
> org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
>         at com.test.rules.MyRulesEngine.<init>(MyRulesEngine.java:51)
>         at com.test.rules.MyRulesEngine.getInstance(MyRulesEngine.java:39)
>         at com.test.rules.MyRulesExecuter.main(MyRulesExecuter.java:38)
> 
> 
> Can anybody help resolving my problem..
> 
> Thanks
> prasad
> 
Based on the stack trace I would guess that the file Sample.pkg contains a
serialized KnowledgeBase and not a serialized KnowledgePackage. Maybe you
could try to do your export like this:

KnowledgeBase kbase = ...;        
KnowledgePackage kpackage = kbase.getKnowledgePackages().iterator().next();
FileOutputStream fos = new FileOutputStream(new File("c:/Sample.pkg"));
DroolsStreamUtils.streamOut(fos, kpackage);

/Mattias

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