How can I bootstrap Jersey REST service server?

Question

I've been thrown into a project that is basically just a REST service an provides some functionality to web clients. However, I can't see any bootstrapping going on yet for the services - like not at all..

In particular I have to setup the file system for the server and its services. Therefore I am looking for a way to get control of the web application as the server is booting up and before it is loading the REST resources:

import javax.ws.rs.Path;
import com.sun.jersey.spi.resource.Singleton;

@Path("/")
@Singleton
public class EnrichmentResource {
    // ...
}

How can I do that? I can only find such simple examples where a REST Controller gets defined but no bootstrapping examples.

Answer 1

There isn't a "pre-entry" part of JAX-RS per se. However, in any JEE application you can always define a WebListener:

@WebListener
public class MyListener implements ServletContextListener {
    @Override
    public void contextInitialized(ServletContextEvent sce) {
        System.out.println( "context initialized" );
    }
}

The contextInitialized() method will be called before anything is called into your REST services. Remember that JAX-RS is still built on top of the servlet framework.