On 28 April 2011 13:42, Michael Anstis <michael.anstis@gmail.com> wrote:

Hi,

This boiler plate code demonstrates a rather, I suspect large, problem:-

@Test
    public void testPackageAttributesFromDRL() {

        KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
        kbuilder.add( new ClassPathResource( "org/drools/example.drl" ), ResourceType.DRL ); //<--- Error

        KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase();
        kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() );

}

throws:-

java.lang.NullPointerException
    at org.drools.compiler.PackageBuilder.generateDeclaredBean(PackageBuilder.java:1433)
    at org.drools.compiler.PackageBuilder.processTypeDeclarations(PackageBuilder.java:1272)
    at org.drools.compiler.PackageBuilder.mergePackage(PackageBuilder.java:895)
    at org.drools.compiler.PackageBuilder.newPackage(PackageBuilder.java:883)
    at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:601)
    at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:297)
    at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:473)
    at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:28)
    at org.drools.BinaryPackage.testPackageAttributesFromDRL(BinaryPackage.java:35)

In org.drools.compiler.PackageBuilder.generateDeclaredBean the call to the following returns null.

JavaDialectRuntimeData dialect = (JavaDialectRuntimeData) pkgRegistry.getDialectRuntimeRegistry().getDialectData( "java" );

DRL is:-

package example

declare Person
age: Integer
name: String
end

rule "Row 1 dtable"
salience 1
dialect "mvel"
when
    $p : Person( name == "Bill" , age != "30" )
then
    $p.setAge( 12345 );
end

It worked OK yesterday.

Any takers?

With kind regards,

Mike