The output of a List method is too verbose. An example:

@XmlRootElement
public class TestA {

private String str;

public TestA() {
}
}

@GET
@Path("list")
@Produces(MediaType.APPLICATION_JSON)
public List<TestA> testListFormat() {
List<TestA> l = new ArrayList<TestA>(3);
l.add(new TestA("a"));
l.add(new TestA("b"));
l.add(new TestA("c"));
List<JSONObject> jl = new ArrayList<JSONObject>(3);
for (TestA a : l)

{ jl.add(new JSONObject(a)); }

JSONArray jsa = new JSONArray(jl);
log.info(jsa.toString());
return l;
}

RESTeasy output format:
[{"testA":{"str":"a"}},{"testA":{"str":"b"}},{"testA":{"str":"c"}}]

JSONObject output format:
[

{"str":"a"}

,

{"str":"b"}

,

{"str":"c"}

]