Get ServletContext in JAX-RS resource

Question

I'm playing around with JAX-RS, deploying on Tomcat. It's basically:

@Path("/hello") @Produces({"text/plain"}) public class Hellohandler {      @GET     public String hello() {         return "Hello World";     }  } 

Is there any way I can get hold of the ServletContext within my JAX-RS resource?

Answer 1

Furthermore, @Resource annotation might not work. Try this

@javax.ws.rs.core.Context  ServletContext context; 

The injection doesn't happen until you hit the service method

public class MyService {     @Context ServletContext context;      public MyService() {          print("Constructor " + context);  // null here          }      @GET     @Path("/thing") {                             print("in  wizard service " + context); // available here 

Answer 2

As others have noted, the servletContext can be injected at the field level. It can also be injected at the method level:

public static class MyService {     private ServletContext context;     private int minFoo;      public MyService() {         System.out.println("Constructor " + context); // null here     }      @Context     public void setServletContext(ServletContext context) {         System.out.println("servlet context set here");         this.context = context;          minFoo = Integer.parseInt(servletContext.getInitParameter("minFoo")).intValue();      }      @GET     @Path("/thing")     public void foo() {         System.out.println("in wizard service " + context); // available here         System.out.println("minFoo " + minFoo);      } } 

This will allow you to perform additional initialization with the servletContext available.

Obvious note - you don't have to use the method name setServletContext. You can use any method name you want so long as you follow the standard java bean naming pattern for setters, void setXXX(Foo foo) and use the @Context annotation.