Enrico Palazzo [https://community.jboss.org/people/pulce] created the discussion "Compile problem with interface initialization" To view the discussion, visit: https://community.jboss.org/message/749098#749098 -------------------------------------------------------------- Hi there! I implemented code to my project that makes use of javassist. However, I constantly fail to implement an interface to a new class I create. Here is the code I use (adapted from http://www.javaranch.com/journal/200711/Journal200711.jsp#a4): http://www.javaranch.com/journal/200711/Journal200711.jsp#a4): *Main file:* package test; import javassist.*; public class Example2 {      public static void main (String[] args) throws Exception {         ClassPool pool = ClassPool.getDefault();         CtClass evalClass = pool.makeClass("Eval"+System.currentTimeMillis());        evalClass.setInterfaces(new CtClass[] { pool.makeClass("Evaluator") });        evalClass.addMethod(CtNewMethod.make("public double eval (double x) { return (x*x-x) ; }", evalClass));        Class clazz = evalClass.toClass();        Evaluator obj  = (Evaluator) clazz.newInstance();        double result = obj.eval(4);        System.out.println(result);     } } *Interface "Evaluator":* package test; public interface Evaluator {      public double eval (double x); } The code works like a charm in the default package of an Eclipse project (without package test; of course). However, when I use it in a package, I get an Error: javassist.CannotCompileException: by java.lang.NoClassDefFoundError: Evaluator -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/749098#749098] Start a new discussion in Javassist at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]