[jboss-user] [Javassist user questions] - javassist.CannotCompileException: by java.lang.LinkageError:

Hi, I am trying to change a class on-the-fly with this small program: | Hello h = new Hello(); | h.say(); | ClassPool cp = new ClassPool(true); | CtClass cc = cp.get("com.blabla.test.Hello"); | CtMethod m = cc.getDeclaredMethod("say"); | m.insertBefore("{ System.out.println(\"Hello.say():\"); }"); | Class c = cc.toClass(); | h = (Hello)c.newInstance(); | h.say(); and I get the following exception: | javassist.CannotCompileException: by java.lang.LinkageError: duplicate class definition: | at javassist.ClassPool.toClass(ClassPool.java:953) | at javassist.ClassPool.toClass(ClassPool.java:896) | at javassist.ClassPool.toClass(ClassPool.java:854) | at javassist.CtClass.toClass(CtClass.java:1053) | at com.blabla.test.PlainTester.testMethodInjection(PlainTester.java:32) | | Caused by: java.lang.LinkageError: duplicate class definition: com/blabla/test/Hello | at java.lang.ClassLoader.defineClass1(Native Method) | at java.lang.ClassLoader.defineClass(ClassLoader.java:620) | at java.lang.ClassLoader.defineClass(ClassLoader.java:465) | at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) | at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) | at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) | at java.lang.reflect.Method.invoke(Method.java:585) | at javassist.ClassPool.toClass2(ClassPool.java:965) | at javassist.ClassPool.toClass(ClassPool.java:947) | ... 6 more Of course, if I don't use the Hello class before injecting that method, it works fine. All the sample programs that I found on the net are showing a method injection without any prior use. However, my requirement is that, I have to be able to change a class while the system is running. Is there any way that we can do that? Your help is greatly appreciated... View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4127954#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...