ObjectMapper can see subclass fields from superclass

Asked Oct 12 '20 at 14:05

Active Oct 12 '20 at 14:09

Viewed 22 times

I realized ObjectMapper's writeValueAsString method takes an Object type as a parameter. But it is able to produce correct JSON from underlying class object(which is a subclass of Object class). Normally, Java compiler wouldn't be able to access fields of a subclass from a superclass. How does ObjectMapper do it?

edited Oct 12 '20 at 14:09

asked Oct 12 '20 at 14:05

nmd_07

4

Probably by using reflection. – Henry Oct 12 '20 at 14:07
Via Reflection? Object.getClass returns subclass... So you can iterate fields – Selvin Oct 12 '20 at 14:07

ObjectMapper can see subclass fields from superclass

0 Answers0