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

@@ -189,14 +189,15 @@
      *  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(clazz);
+            return itype.changeReturnType(c);
         if (!isStatic())
-            return itype.insertParameterTypes(0, clazz);
+            return itype.insertParameterTypes(0, c);
         return itype;
     }
 
     /** Utility method producing the parameter types of the method type. */
     public Class<?>[] getParameterTypes() {