src/java.base/share/classes/java/lang/reflect/ReflectAccess.java

*** 145,150 ****
--- 145,161 ----
      }
  
      public <T> Constructor<T> copyConstructor(Constructor<T> arg) {
          return arg.copy();
      }
+ 
+     //
+     // Comparing / Hashing Method parameter types
+     //
+     public boolean methodParameterTypesEquals(Method method1, Method method2) {
+         return method1.parameterTypesEquals(method2);
+     }
+ 
+     public int methodParameterTypesHashCode(Method method) {
+         return method.parameterTypesHashCode();
+     }
  }