@SuppressWarnings("unchecked")
public static void replace(Debugger debugger, File classFile, String className) {
VirtualMachine vm = debugger.getVm();
if (vm == null) return;
if (!vm.canRedefineClasses()) return;
byte[] classBytes = loadClassFile(classFile);
if (classBytes == null ) return;
List classes = vm.classesByName(className);