Modify java.util class using byte-buddy-agent
问题 Is it possible to add a field in java.util class using byte-buddy? I am trying to add a field in java.util.concurrent.FutureTask and intercept constructor and an arbitrary method to set and get the field value. In short, I am trying to add a field to FutureTask so that I can pass some value to child thread from parent even if they are running in a thread pool. isn't it possible to add a field in FutureTask? FutureTaskTransofrmer @Override protected ElementMatcher.Junction<TypeDescription>