Generating Java POJO from JSON and using the generated class without having to change code

I'm trying to generate POJO from Json and for that I've found jsonschema2pojo.

But I'd like to use the generated class from my code without having to change my code everytime a new class is generated. I'll receive many different Json's and I'd like to use them as POJO's without interrupting the program.

I also need to access at least a variable from each POJO that might have a different name, for that I was thinking of using Java reflection.

I'd like to know if this is doable, or if there's better ways to implement this.