best way to convert JSONB object from result

Hi:

I am trying to convert to a Java or Map object
from resultset with a jsonb column.
Currently, I am using

String jsonString = resultSet.getString("jsonb_column_name")

then I convert from jsonString to a Map<String,Object> or a Java class
object.

This is obviously inefficient. What would be most efficient (not too
complicated)

Thanks in Advance