How to make Jersey/Jackson serialize empty list; single element list as an array

Question

Using Jersey and Jackson to create a REST interface, how do I get List fields to be serialized as a list when there are 0 or 1 elements in them. For example:

Answer 1

I am pretty sure that you are not actually using Jackson ("POJO" variant of JSON serialization), since Jackson would not convert single-element arrays or lists to anything else. So you are probably using one of legacy output methods (like jettison); meaning that if you configure system to use POJO mapping it should just work.