ClassFab cf = newClassFab("FredRunnable", BaseLocatable.class);
cf.addInterface(Runnable.class);
cf.addInterface(Serializable.class);
cf.addField("_map", Map.class);
cf.addConstructor(new Class[]{Map.class, Runnable.class},
new Class[]{IllegalArgumentException.class, DataFormatException.class}, "{ _map = $1; }");
MethodSignature sig = new MethodSignature(Map.class, "doTheNasty", new Class[]{int.class, String.class},