Jackson serialize only interface methods

Question

I have one object A with some methods ma, mb, mc and this object implements an interface B with only ma and mb

Answer 1

Just annotate your interface such that Jackson constructs data fields according to the interface's class and not the underlying object's class.

@JsonSerialize(as=Interf.class)
public interface Interf {
  public boolean isNo();
  public int getCountI();
  public long getLonGuis();
}