javassist.CannotCompileException: [source error] Method m is private -------------------------------------------------------------------- Key: JASSIST-239 URL: https://issues.jboss.org/browse/JASSIST-239 Project: Javassist Issue Type: Enhancement Affects Versions: 3.18.2-GA Reporter: Eric Nielsen Assignee: Shigeru Chiba Given these classes: {code} public abstract class A { public static void m() { return m(aClass()); } private static void m(Class<? extends A> aClass) { // some logic here } private static Class<? extends A> aClass() { // some logic here, subclasses will have own implementation } } public class B extends A { } {code} I'm writing instrumentation for subclasses of {{A}} (like {{B}} above). The code is something like: {code} // source is class A, target is subclass of A private void instrument(CtClass source, CtClass target) throws NotFoundException, CannotCompileException { CtMethod[] sourceMethods = source.getDeclaredMethods(); for (CtMethod method : sourceMethods) { int modifiers = method.getModifiers(); if (Modifier.isStatic(modifiers)) { CtMethod newMethod; if (Modifier.isPublic(modifiers) || Modifier.isProtected(modifiers)) { newMethod = CtNewMethod.copy(method, target, null); StringBuilder body = new StringBuilder().append("{ "); if (!CtClass.voidType.equals(method.getReturnType())) { body.append("return "); } body.append(method.getName()).append("(aClass()"); if (method.getParameterTypes().length > 0) { body.append(", $$"); } body.append("); }"); newMethod.setBody(body.toString()); } else if ("aClass".equals(method.getName())) { newMethod = CtNewMethod.copy(method, target, null); newMethod.setBody("{ return " + target.getName() + ".class; }"); } else { newMethod = CtNewMethod.delegator(method, target); } // include the generic signature for (Object attr : method.getMethodInfo().getAttributes()) { if (attr instanceof SignatureAttribute) { newMethod.getMethodInfo().addAttribute( (SignatureAttribute) attr); } } target.addMethod(newMethod); } } } {code} I want to achieve the result below with the instrumentation: {code} public class B extends A { public static void m() { return m(aClass()); // a copy of superclass code } private static void m(Class<? extends A> aClass) { super.m(aClass); // delegates to superclass } private static Class<? extends A> aClass() { return B.class; // returns this class } } {code} So when calling {{B.m()}}, the logic in the {{m(Class)}} superclass method will run receiving {{B.class}} as parameter. When running instrumentation, I get the following error message: {code} javassist.CannotCompileException: [source error] Method m is private {code} What's wrong?