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

*** 189,202 ****
       *  For non-static methods or constructors, this is the type with a leading parameter,
       *  a reference to declaring class.  For static methods, it is the same as the declared type.
       */
      public MethodType getInvocationType() {
          MethodType itype = getMethodOrFieldType();
          if (isConstructor() && getReferenceKind() == REF_newInvokeSpecial)
!             return itype.changeReturnType(clazz);
          if (!isStatic())
!             return itype.insertParameterTypes(0, clazz);
          return itype;
      }
  
      /** Utility method producing the parameter types of the method type. */
      public Class<?>[] getParameterTypes() {
--- 189,203 ----
       *  For non-static methods or constructors, this is the type with a leading parameter,
       *  a reference to declaring class.  For static methods, it is the same as the declared type.
       */
      public MethodType getInvocationType() {
          MethodType itype = getMethodOrFieldType();
+         Class<?> c = clazz.isValue() ? clazz.asValueType() : clazz;
          if (isConstructor() && getReferenceKind() == REF_newInvokeSpecial)
!             return itype.changeReturnType(c);
          if (!isStatic())
!             return itype.insertParameterTypes(0, c);
          return itype;
      }
  
      /** Utility method producing the parameter types of the method type. */
      public Class<?>[] getParameterTypes() {