URL url = Resources.getResource(k2);
byte[] clazz = Resources.toByteArray(url);
ClassReader cr = new ClassReader(clazz);
ClassWriter cw = writer();
TraceClassVisitor visitor = new TraceClassVisitor(cw, new Textifier(), new PrintWriter(System.out));
//getTracer(false)
ValueHolderReplacementVisitor v2 = new ValueHolderReplacementVisitor(visitor);
cr.accept(v2, ClassReader.EXPAND_FRAMES );//| ClassReader.SKIP_DEBUG);
byte[] output = cw.toByteArray();