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Steps to Reproduce:

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you can reproduce the problem by test code below.

public static void main(String[] args) throws Exception {
Class clazz = Person.class;
Method method = clazz.getMethod("getName", null);

JavaFunction javaFunction = new JavaFunction("person", new LinkedList<>(), clazz, method);
EvaluationContext evaluationContext = new EvaluationContextImpl(clazz.getClassLoader(), new FEELEventListenersManager());

Either<FEELEvent, Object> result = javaFunction.invoke(evaluationContext, new Object[]{});
result.consume(System.out::println, System.out::println);
}

public static class Person {

public String getName()
{ return "test"; }
}

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you can reproduce the problem by test code below. public static void main(String[] args) throws Exception { Class clazz = Person.class; Method method = clazz.getMethod("getName", null); JavaFunction javaFunction = new JavaFunction("person", new LinkedList<>(), clazz, method); EvaluationContext evaluationContext = new EvaluationContextImpl(clazz.getClassLoader(), new FEELEventListenersManager()); Either<FEELEvent, Object> result = javaFunction.invoke(evaluationContext, new Object[]{}); result.consume(System.out::println, System.out::println); } public static class Person { public String getName() { return "test"; } }
Docs QE Status:
NEW
QE Status:
NEW

I create a dmn by business modeler desktop. And got a "object is not an instance of declaring class" error while execute java function.

Looking into org.kie.dmn.feel.runtime.functions.JavaFunction#invoke(EvaluationContext,Object[]), i think there may be some thing wrong in line 68:

Object result = method.invoke( clazz, actualParams );

I think,the first parameter of java.lang.reflect.Method#invoke(Object,Object...) may should be an instance of Class rather than the class it self?