At the moment you have to create instance of object beforehand and then set parameters on it... Can you add Builder to classes (similar to what lombok has).

So instead of doing it like this:
Class1 test = new Class1();
test.setClass2(new Class2().id("test").something('hshj"));

you could use sometjing like this

Class1 test = Class1.builder()
.class2(Class2.builder().id("test").build())
.build();