[rules-users] OSGI, classloading, and imports in KnowledgeBuilder

[Lasse.Wallentin at APCC.com]

Lasse Wallentin |  APC by Schneider Electric  |   Senior Software 
Developer 
Phone: ++45 72 190 134  |   Mobile: ++45 41 37 7974 
Email: lasse.wallentin at apc.com  |   Address: Silcon Allé 1, DK-6000 
Kolding 
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rules-users-bounces at lists.jboss.org wrote on 12-08-2009 14:39:12:

> Lasse.Wallentin at apcc.com wrote:
> >>> Can anyone sketch a setup so that I can use Drools from within an 
> > Eclipse 
> >>> plugin?
> >> I've got it running. You need to make sure your classloaders are the
> >> right ones.
> >> I use the
> >> new PackageBuilderConfiguration(Classloader, Properties)
> >>
> >> ctor (if you're setting CL later, Properties may fail to apply) and
> >>
> >> new RuleBaseConfiguration(Classloader)
> >>
> >> respectively. I guess the knowledge-based apis have matching ctors. I
> >> use the classloader of my project, which imports the needed drools
> >> namespaces. That last part may need some time, but I's doable.
> >>
> > 
> > I have tried the following:
> > 
> > KnowledgeBuilderConfiguration builderConfiguration = 
> > KnowledgeBuilderFactory.newKnowledgeBuilderConfiguration(null, 
> > getClass().getClassLoader());
> > KnowledgeBuilder kbuilder = 
> > KnowledgeBuilderFactory.newKnowledgeBuilder(builderConfiguration);
> > Resource pathResource = ResourceFactory.newClassPathResource(path, 
> > getClass());
> > kbuilder.add(pathResource, ResourceType.DTABLE, dtableconfiguration);
> > 
> > However it still fails ...
> > 
> > Does this compare to what you are doing? Are you able to do 
DecisionTables 
> > as well?
> Roughly; I use neither knowledge API nor tables. However I guess you're
> not importing org.drools.base.extractors, so your classloader won't let
> drools load that class. There was a heap of drools stuff I've never
> heard of but had to import before it worked.

I have tried importing all packages this does not change anything.

/Lasse