Why would “java.lang.IllegalStateException: The resource configuration is not modifiable in this context.” appear deploying Jersey app?

Question

I have created an app implementing REST services locally using:

Eclipse Indigo Jersey 2.4 Tomcat 7.0.47

When running locally using Eclipse, the services work

Answer 1

In my case it was just a missing @PathParam("id") for the 'int id' declaration. Wrong code:

@POST
@Path("{id}/messages")
public Response returnMessages(int id, Message[] msgs) {

Corrected code:

@POST
@Path("{id}/messages")
public Response returnMessages(@PathParam("id") int id, Message[] msgs) {