[rules-users] Unable to find implementation for BusinessRuleProvider

[Bruno Freudensprung]

Hi,

If it is not the case already, could you try adding the 
"drools-ide-common" jar (along with its dependencies) to the classpath 
of your project?
Best regards,

Bruno.

John Peterson a écrit :
>
> Hi,
>
> I've been experimenting with the Guided Rule Editor plug-in in 
> Eclipse.  I've built a Drools Project using the default Hello World 
> sample application.  I've created a new "Guided Rule" in my project 
> called "GuidedRule.brl" and get the associated "drools.package" with 
> it.  The rule is simple:
>
> WHEN
>
> THEN
>
>   System.out.println("Rule has fired");
>
> I build the knowledge base as follows:
>
>        * private** static* KnowledgeBase readKnowledgeBase()* throws* 
> Exception {
>
>                 KnowledgeBuilder kbuilder = 
> KnowledgeBuilderFactory./newKnowledgeBuilder/();
>
>                 
> kbuilder.add(ResourceFactory./newClassPathResource/("SampleGuided.drl"), 
> ResourceType./BRL/);
>
>                 KnowledgeBuilderErrors errors = kbuilder.getErrors();
>
>                * if* (errors.size() > 0) {
>
>                        * for* (KnowledgeBuilderError error: errors) {
>
>                                 System./err/.println(error);
>
>                         }
>
>                        * throw** new* IllegalArgumentException("Could 
> not parse knowledge.");
>
>                 }
>
>                 KnowledgeBase kbase = 
> KnowledgeBaseFactory./newKnowledgeBase/();
>
>                 
> kbase.addKnowledgePackages(kbuilder.getKnowledgePackages());
>
>                * return* kbase;
>
>         }
>
> The only line changed is adding the resource of type BRL.
>
> When I try to run, I get the following error:
>
> _java.lang.RuntimeException_:_ 
> org.drools.compiler.DroolsParserException_:_ 
> org.drools.CheckedDroolsException_: Unable to find implementation for 
> BusinessRuleProvider
>
>         at 
> org.drools.compiler.PackageBuilder.addKnowledgeResource(_PackageBuilder.java:544_)
>
>         at 
> org.drools.builder.impl.KnowledgeBuilderImpl.add(_KnowledgeBuilderImpl.java:28_)
>
>         at com.sample.DroolsTest.readKnowledgeBase(_DroolsTest.java:41_)
>
>         at com.sample.DroolsTest.main(_DroolsTest.java:23_)
>
> Caused by:_ org.drools.compiler.DroolsParserException_:_ 
> org.drools.CheckedDroolsException_: Unable to find implementation for 
> BusinessRuleProvider
>
>         at 
> org.drools.compiler.PackageBuilder.addPackageFromBrl(_PackageBuilder.java:386_)
>
>         at 
> org.drools.compiler.PackageBuilder.addKnowledgeResource(_PackageBuilder.java:470_)
>
>         ... 3 more
>
> Caused by:_ org.drools.CheckedDroolsException_: Unable to find 
> implementation for BusinessRuleProvider
>
>         at 
> org.drools.compiler.BusinessRuleProviderFactory.throwNoImplementationFound(_BusinessRuleProviderFactory.java:66_)
>
>         at 
> org.drools.compiler.BusinessRuleProviderFactory.loadProvider(_BusinessRuleProviderFactory.java:42_)
>
>         at 
> org.drools.compiler.BusinessRuleProviderFactory.getProvider(_BusinessRuleProviderFactory.java:25_)
>
>         at 
> org.drools.compiler.PackageBuilder.addPackageFromBrl(_PackageBuilder.java:366_)
>
>         ... 4 more
>
> I've tried variations to add the drools.package as a PKG type, I've 
> had the rules (and package) in both "com.sample" and /src/main/rules, 
> but I can't seem to resolve the problem.  "drools.package" has been 
> updated to include the package name (package com.sample;) and I import 
> the message class as well (even though it isn't being used currently).
>
> I suspect the issue is simple, but I haven't been able to figure it 
> out.  Any help would be appreciated.
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>   

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.jboss.org/pipermail/rules-users/attachments/20110314/ef1ba390/attachment.html