[rules-users] Unable to find implementation for BusinessRuleProvider

[John Peterson]

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.j
ava:544)
	at
org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.ja
va: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.j
ava:470)
	... 3 more
Caused by: org.drools.CheckedDroolsException: Unable to find
implementation for BusinessRuleProvider
	at
org.drools.compiler.BusinessRuleProviderFactory.throwNoImplementationFou
nd(BusinessRuleProviderFactory.java:66)
	at
org.drools.compiler.BusinessRuleProviderFactory.loadProvider(BusinessRul
eProviderFactory.java:42)
	at
org.drools.compiler.BusinessRuleProviderFactory.getProvider(BusinessRule
ProviderFactory.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.


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