servletsdependency-injectionguiceservlet-listenersguice-servlet

Injecting dependencies to ServletContextListener with Guice

Since ServletContextListener is created by the server, not by Guice I can't find a way to make it work together. How do I get guice injector at ServletContextListener?

Maybe there is better way to shutdown services like logger or persistance then doing it at contextDestroyed method and initialize them at contextInitialized?

Solution

  • The extension GuiceServlet puts the injector in the servlet context, so you can get it by doing something like this:

    public class MyServletContextListener implements ServletContextListener {

    @Override
    public void contextDestroyed(ServletContextEvent sce) {
        Injector injector = (Injector) sce.getServletContext()
                                          .getAttribute(Injector.class.getName());      
    }
}