[rules-users] Having problems with traits in 5.4.0beta2

[Greg Barton]

I'm trying out the traits feature and I'm having some problems.  I'm preparing simple Monkeys and Bananas example with existing classes that I want to add traits, but when I try adding a trait (either declared in DRL or as a static interface) I'm getting an exception thrown from the call to don().  Here's the code:


declare HungryMonkey
	@format(trait)
end


rule "foo"
	when
		monkey : Monkey(  )
	then 
		HungryMonkey hm = don(monkey, HungryMonkey.class);
end

And the exception thrown:

Exception in thread "main" Exception executing consequence for rule "foo" in org.gregcode.mnb: org.drools.RuntimeDroolsException: Field/method 'attachment' not found for class 'org.gregcode.mnb.MonkeyWrapper'
	at org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1101)
	at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1029)
	at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1251)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:709)
	at org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:673)
	at org.gregcode.mnb.Main.main(Main.java:49)
Caused by: org.drools.RuntimeDroolsException: Field/method 'attachment' not found for class 'org.gregcode.mnb.MonkeyWrapper'
	at org.drools.base.ClassFieldAccessorFactory.getClassFieldWriter(ClassFieldAccessorFactory.java:199)
	at org.drools.base.ClassFieldAccessorCache$CacheEntry.getWriteAccessor(ClassFieldAccessorCache.java:187)
	at org.drools.base.ClassFieldAccessorCache.getWriteAcessor(ClassFieldAccessorCache.java:116)
	at org.drools.base.ClassFieldAccessorStore.wire(ClassFieldAccessorStore.java:424)
	at org.drools.base.ClassFieldAccessorStore.getAccessor(ClassFieldAccessorStore.java:216)
	at org.drools.factmodel.traits.TraitFactory.buildWrapperClassDefinition(TraitFactory.java:340)
	at org.drools.factmodel.traits.TraitFactory.getCoreWrapper(TraitFactory.java:310)
	at org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:493)
	at org.drools.base.DefaultKnowledgeHelper.don(DefaultKnowledgeHelper.java:522)
	at org.gregcode.mnb.Rule_foo_3c2199da53c4480ea0ec7b3d1c4781b5.defaultConsequence(Rule_foo_3c2199da53c4480ea0ec7b3d1c4781b5.java:7)
	at org.gregcode.mnb.Rule_foo_3c2199da53c4480ea0ec7b3d1c4781b5DefaultConsequenceInvokerGenerated.evaluate(Unknown Source)
	at org.gregcode.mnb.Rule_foo_3c2199da53c4480ea0ec7b3d1c4781b5DefaultConsequenceInvoker.evaluate(Unknown Source)
	at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1091)


"MonkeyWrapper" is not in my code, so I'm assuming it's generated.  I also tried creating a HungryMonkey and HungryMonkeyImpl interface/class pair like the Scholar and ScholarImpl from the traits example, but the same exception happened.  Any clues?