Get ServletContext in Application

Question

Could you possibly explain how I can get the ServletContext instance in my Application\'s sub-class? Is it possible? I have tried to do it like in

Answer 1

You can use the ApplicationEventListener interface to get the ServletContext. After initialization has finished, you can 'catch' an ApplicationEvent and use the injected ServletContext to work with.

Works fine with: org.glassfish.jersey : 2.12
For additional versions, pls use comments - i dont know, sry.

Jersey Docs - 20.1.2. Event Listeners

Your MainApplication:

@ApplicationPath("/")
public class MainApplication extends Application {
    @Override
    public Set> getClasses() {     
        Set> set = new HashSet>();
        set.add(MainApplicationListener.class);
        return classes;
    }
}

... or alternative MainResourceConfig (I prefer to use this one):

public class MainResourceConfig extends ResourceConfig {
    public MainResourceConfig() {
        register(MainApplicationListener.class);
    }
}

And the ApplicationEventListener:

public class MainApplicationListener implements ApplicationEventListener {

    @Context
    private ServletContext ctx; //not null anymore :)

    @Override
    public void onEvent(ApplicationEvent event) {
        switch (event.getType()) {
            case INITIALIZATION_FINISHED:
            // do whatever you want with your ServletContext ctx
            break;
    }

    @Override
    public RequestEventListener onRequest(RequestEvent requestEvent) {
        return null;
    }

}