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According to Reflection API documentation (https://docs.oracle.com/javase/8/docs/api/java/lang/Class.html#getDeclaredMethods--) method Class.getDeclaredMethods() "returns an array containing Method objects reflecting all the declared methods of the class or interface represented by this Class object, including public, protected, default (package) access, and private methods, but excluding inherited methods". When using eclipse to compile and execute program below the returned array has two methods but it should has only one method. Program import java.lang.reflect.Method; public interface A { public A clone(); public static void main(String[] args) { Method[] methods = A.class.getDeclaredMethods(); for (Method method : methods) { System.out.println(method.toString()); } } } Current result public abstract A A.clone() public default java.lang.Object A.clone() throws java.lang.CloneNotSupportedException Expected result public abstract A A.clone() Configuration Software O.S.: Windows 10 Eclipse: Eclipse Neon 4.6 Hardware: Intel(R) Core(TM) i5-5200U CPU @ 2.20GHz
Of course Eclipse doesn't implement Class.getDeclaredMethods() so we couldn't be blamed if that method were wrong :) What you are indirectly observing is: different compilers produce or don't produce an additional synthetic bridge method. javac generates: public abstract A clone(); descriptor: ()LA; flags: ACC_PUBLIC, ACC_ABSTRACT ecj additionally generates: public java.lang.Object clone() throws java.lang.CloneNotSupportedException; descriptor: ()Ljava/lang/Object; flags: ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC Exceptions: throws java.lang.CloneNotSupportedException Code: stack=1, locals=1, args_size=1 0: aload_0 1: invokeinterface #44, 1 // InterfaceMethod clone:()LA; 6: areturn LineNumberTable: line 1: 0 This looks funny, indeed, but should be harmless, because for every implementing class the class's version of clone() will override the shown bridge method. Still needs to be checked against JLS, perhaps we missed a special rule for clone() methods (which are special in several regards). For applications using Class.getDeclaredMethods() it is always a good idea, to filter out all methods where isSynthetic() answers true.
I'm worried about using Method.isSynthetic to check if a method is synthetic (please, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=516540). What do you suggest in this case?
Bulk move out of 4.8
This bug hasn't had any activity in quite some time. Maybe the problem got resolved, was a duplicate of something else, or became less pressing for some reason - or maybe it's still relevant but just hasn't been looked at yet. If you have further information on the current state of the bug, please add it. The information can be, for example, that the problem still occurs, that you still want the feature, that more information is needed, or that the bug is (for whatever reason) no longer relevant. -- The automated Eclipse Genie.
