JerseyServlet doesn't save object in memory - json

Question

since I was sitting the whole day and could not figure out the problem, I am hoping you can help me.
Here you can see a Jersey service class. This class should simply store teams, and you can add and retrieve teams.
#Path("/jsonServices")
public class JerseyRestService {
Tournament tournament = new Tournament();
#POST
#Path("/send")
#Consumes(MediaType.APPLICATION_JSON)
public Response consumeJSON(Team team) {
tournament.addTeam(team);
return Response.status(200).entity(team.toString() + tournament.teams.size()).build();
}
#GET
#Path("/print/{name}")
#Produces(MediaType.APPLICATION_JSON)
public Team produceJSON(#PathParam("name") String name) {
return tournament.getTeam(name);
}
}
public class Tournament {
List<Team> teams = new ArrayList<Team>();
public boolean addTeam(Team student) {
return teams.add(student);
}
public Team getTeam(String name) {
System.err.println("Halleluja");
return teams.get(0);
}
}
I am adding teams with a simple client:
public class JerseyPost {
private static Client client;
private static WebResource webResource;
private static ClientResponse response;
public static void main(String[] args) {
try {
ClientConfig clientConfig = new DefaultClientConfig();
clientConfig.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, true);
client = Client.create(clientConfig);
webResource = client.resource("http://localhost:8080/JerseyJSONExample/rest/jsonServices/send");
webResource.accept(MediaType.APPLICATION_JSON);
response = webResource.type(MediaType.APPLICATION_JSON).post(ClientResponse.class, new Team("1", "Batman1","Robin1"));
if (response.getStatus() != 200) {
throw new RuntimeException("Failed: HTTP error code: " + response.getStatus());
}
System.out.println(response.getEntity(String.class));
} catch (Exception e) {
e.printStackTrace();
}
}
}
Unfortunetly the teams are not saved. After I add a team the list size is always just one.
When I try a GET request the list is always empty.
Thank you very much, for any help you can prvide me.
Regards Robert

Answer 1

Refer here Jersey creates new instance of Resource class for every new request.
Resource class (JerseyRestService in your case)
By default the life-cycle of root resource classes is per-request
which, namely that a new instance of a root resource class is created
every time the request URI path matches the root resource. This makes
for a very natural programming model where constructors and fields can
be utilized (as in the previous section showing the constructor of the
SparklinesResource class) without concern for multiple concurrent
requests to the same resource.
So tournament.addTeam(team); you populate here will be available only for consumeJSON method
to solve your problem make 'tournament' as static so that it will be shared across all the instance
static Tournament tournament = new Tournament();
Hope that helps