src/java.base/share/classes/java/lang/invoke/MethodHandleImpl.java

@@ -1782,10 +1782,15 @@
             @Override
             public String getName(Object mname) {
                 MemberName memberName = (MemberName)mname;
                 return memberName.getName();
             }
+            @Override
+            public Class<?> getDeclaringClass(Object mname) {
+                MemberName memberName = (MemberName)mname;
+                return memberName.getDeclaringClass();
+            }
 
             @Override
             public MethodType getMethodType(Object mname) {
                 MemberName memberName = (MemberName)mname;
                 return memberName.getMethodType();