[rules-users] Compilation errors with 5.3.0.CR1

[Wacław Borowiec]

Hello

I'm sending the message once again due to problems with code samples 
visibility in the previous one.

I've got following rule:

rule "enabled paramId: 1, id: 0"
salience 50
when
     (def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == def0, requiredValue == 1))
     $param : EmParamValue(id == 1, enabled == false)
     not ParentDisabled(id == 1)
then
     $param.setEnabled(true);
     update($param);
end


It compiles fine under Drools 5.1.1, but after switching to 5.3.0.CR1 I 
get following exception:

[Error: unexpected end of statement]
[Near : {... def ....}]
                 ^
[Line: 1, Column: 4]
     at org.mvel2.compiler.AbstractParser._captureBlock(AbstractParser.java:1470)
     at org.mvel2.compiler.AbstractParser.captureCodeBlock(AbstractParser.java:1446)
     at org.mvel2.compiler.AbstractParser.nextToken(AbstractParser.java:421)
     at org.mvel2.compiler.ExpressionCompiler._compile(ExpressionCompiler.java:128)
     at org.mvel2.compiler.ExpressionCompiler.compile(ExpressionCompiler.java:62)
     at org.mvel2.MVEL.analysisCompile(MVEL.java:668)
     at org.mvel2.MVEL.analysisCompile(MVEL.java:672)
     at org.drools.rule.builder.PatternBuilder.setInputs(PatternBuilder.java:854)
     at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:595)
     at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:397)
     at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:309)
     at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:132)
     at org.drools.rule.builder.GroupElementBuilder.build(GroupElementBuilder.java:65)
     at org.drools.rule.builder.RuleBuilder.build(RuleBuilder.java:80)
     at org.drools.compiler.PackageBuilder.addRule(PackageBuilder.java:2241)
     at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:802)
     at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:388)
     at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:566)
     at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:35)
     at com.proximetry.elmgr.services.DependenciesBean$Expander.addDrl(DependenciesBean.java:110)


It is

(def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == def0, requiredValue == 1))


line that causes the problem - the exeption disappears after removing 
it. What's interesting, when I add '$' sign to binding variable name, 
and the line looks like:

($def0: EmParamDefinition(paramName == "p2", listIndex == -1) and EmParamValue(paramDefinitionId == $def0, requiredValue == 1))


instead of the exception I get DRL error:

[DialectError message='Unable to wire compiled classes, probably related to compilation failures:sun.reflect.generics.reflectiveObjects.WildcardTypeImpl cannot be cast to java.lang.Class']


For completness, this is how I add DRL resources:

public void addDrl(Reader rdr) {
		KnowledgeBuilder kBuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
	
	        kBuilder.add( ResourceFactory.newReaderResource(rdr), ResourceType.DRL);
	        if( kBuilder.hasErrors() ){
	            for( KnowledgeBuilderError err: kBuilder.getErrors() ){
	            	StackTrace.error(this, err);
	            }
	            throw new IllegalStateException( "DRL errors" );
	        }
	        knowledgeBase.addKnowledgePackages( kBuilder.getKnowledgePackages() );
		}


I would be grateful if someone has an idea, why after switching Drools 
version such problem exists.