Assume a POJO is used as a fact and annotated with @Position as follows:

public class PositionAnnotatedEvent {

  @Position(1)
  private String arg1;

  @Position(0)
  private String arg0;

  // getters and setters
}

When I add some metadata to this class in DRL, for example:

declare org.jboss.qa.brms.bre.regression.POJOAnnotationMergeTest.PositionAnnotatedEvent
    @role(event)
end 

Then the following rule using positional arguments does not compile, producing an IndexOutOfBoundsException with message 'Error trying to access field at position 0'. The same rule with named arguments compiles:

rule 'sample rule' 
when 
  org.jboss.qa.brms.bre.regression.POJOAnnotationMergeTest.PositionAnnotatedEvent( 'value1', 'value2'; ) 
then
end 

The relevant stack trace follows:

java.lang.IndexOutOfBoundsException: Error trying to access field at position 0
	at org.drools.factmodel.ClassDefinition.getField(ClassDefinition.java:162)
	at org.drools.rule.builder.PatternBuilder.processPositional(PatternBuilder.java:432)
	at org.drools.rule.builder.PatternBuilder.processConstraintsAndBinds(PatternBuilder.java:392)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:310)
	at org.drools.rule.builder.PatternBuilder.build(PatternBuilder.java:131)
	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:2578)
	at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:970)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:456)
	at org.drools.compiler.PackageBuilder.addKnowledgeResource(PackageBuilder.java:643)
	at org.drools.builder.impl.KnowledgeBuilderImpl.add(KnowledgeBuilderImpl.java:41)


I will attach a link to pull request with a test case shortly.


Version-Release number of selected component (if applicable):

Tested on BRMS version 5.3.1.BRMS-ER3, the same problem occurs in Drools 6.0.0-SNAPSHOT.


How reproducible:

Will attach a link to pull request shortly.