How to Restrict unassigned variable to not get from POJO to JSON?

I have a class A, with two variable varOne, varTwo,
While assigning I only assigned varTwo, but when converting to JSON I’m getting both the value
one which was unassigned is as null.
What can I do to restrict varOne. if varOne is unassigned the I don’t want it at all in Json.

I tried reconstruct the JSON. but feels like could do better.

>Solution :

You can put @JsonInclude(JsonInclude.Include.NON_NULL) above the class