[rules-users] NoClassDefFoundError: BaseObjectClassFieldReader

[keithnielsen]

Further testing shows that while the rules engine can locate facts from other
plug-ins (facts located in the same plugin as the rules engine work fine,
but not realistic to expect that all facts will be co-located in the same
plugin), an attempt to reconstitute them using the ByteArrayClassloader will
not work. Has anyone been successful using facts located in other plug-ins?
I am using Drools 5.M2 with Eclipse 3.4.



keithnielsen wrote:
> 
> I have the following rule:
> 
> rule "Retrieve CID Presentation Model"
> 	ruleflow-group "RetrieveCID"
> 	
> 	when
> 	
> CIDPresentationModel($cidValue:cidValue,$cidExpirationDate:expirationDate)	
> 	then
> 		boolean cidResult =
> cidService.verifyCIDIsValid($cidValue,$cidExpirationDate);
> 		CIDResult result = new CIDResult(cidResult);
> 		insert(result);
> 		System.out.println("Executing: Retrieve CID Presentation Model");
> end
> 
> Deep in the bowels of drools there is a call to
> ClassFieldAccessorFactory.getClassFieldReader where it attempts to create
> a class using the byte array classloader, i.e. final Class<?> newClass =
> byteArrayClassLoader.defineClass(className, bytes,PROTECTION_DOMAIN). Its
> at this point that a NoClassDefFoundError on the
> BaseObjectClassFieldReader. From what I understand of NoClassDefFoundError
> it can result when there are two sources of the same class in the
> classpath or if there is some reference from the class resulting in the
> error to another class that can not be resolved. It only appears in
> situations where there is fields involved. It doesnt seem to matter how
> simple the object is, the minute I try to use field assignment it throws
> an error.
> 
> The rules engine is running as an Eclipse plug-in.
> 

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