Cannot resolve ambiguous delegation of public void java.lang.Thread.run() to public final native void java.lang.Object.notify() or public final native void java.lang.Object.notifyAll()

[tutuerhao]

Cannot resolve ambiguous delegation of public void java.lang.Thread.run() to public final native void java.lang.Object.notify() or public final native void java.lang.Object.notifyAll()

public static void main(String[] args) throws IOException {
        ByteBuddyAgent.install();

        Map<TypeDescription, byte[]> map = new HashMap<>();
        map.put(TypeDescription.ForLoadedType.of(TraceThreadIntercepter.class), ClassFileLocator.ForClassLoader.read(TraceThreadIntercepter.class));
        map.put(TypeDescription.ForLoadedType.of(Object.class), ClassFileLocator.ForClassLoader.read(Object.class));
        ClassInjector.UsingUnsafe.ofBootLoader().inject(map);
        Thread t = new Thread(() -> System.out.println("Thread run"));
        new ByteBuddy().redefine(Thread.class)
                .method(ElementMatchers.named("run"))
                .intercept(MethodDelegation.to(new TraceThreadIntercepter()))
                .make()
                .load(Thread.currentThread().getContextClassLoader(), ClassReloadingStrategy.fromInstalledAgent());
        t.start();
    }

    public static class TraceThreadIntercepter {

        @RuntimeType
        public void run(@SuperCall Callable zuper) {
            System.err.println("Trace start");
            try {
                zuper.call();
            } catch (Exception e) {
                log.error(e.getMessage(), e);
            }
            System.err.println("Trace end");
        }
    }

[raphw]

With redefinition, you replace methods and no super method might be available. That's why it considers different delegation targets then your method.

Have a look into Advice which is likely better suited.

[tutuerhao]

Could you please give an example? @raphw

[raphw]

It would work without @SuperCall Callable zuper. But if you wanted to add code to the beginning and end of a method, Advice does exactly that. Have a look at the javadoc for the class.

[tutuerhao]

Thanks！ @raphw

[tutuerhao]

Thanks！ @raphw