Guice and Shiro Aop

MyGuiceServletConfig.java

import javax.servlet.ServletContext;
import javax.servlet.ServletContextEvent;

import org.apache.shiro.guice.aop.ShiroAopModule;
import org.apache.shiro.guice.web.GuiceShiroFilter;

import com.google.inject.Guice;
import com.google.inject.Injector;
import com.google.inject.Provides;
import com.google.inject.Singleton;
import com.google.inject.persist.PersistFilter;
import com.google.inject.persist.jpa.JpaPersistModule;
import com.google.inject.servlet.GuiceServletContextListener;
import com.google.inject.servlet.ServletModule;
import com.rhem.server.requestfactory.InjectedRequestFactoryModule;
import com.rhem.server.requestfactory.InjectedRequestFactoryServlet;


//http://turbomanage.wordpress.com/2009/12/11/how-to-inject-guice-objects-in-a-jsp/
public class MyGuiceServletConfig extends GuiceServletContextListener {
        private ServletContext servletContext;
        
        @Override
        public void contextInitialized(ServletContextEvent servletContextEvent) {
                // No call to super as it also calls getInjector()                
                servletContext = servletContextEvent.getServletContext();
                servletContext.setAttribute(Injector.class.getName(), getInjector());
        }
        
        @Override
        public void contextDestroyed(ServletContextEvent servletContextEvent) {
                ServletContext sc = servletContextEvent.getServletContext();
                sc.removeAttribute(Injector.class.getName());
                super.contextDestroyed(servletContextEvent);
        }
        
        @Override
        protected Injector getInjector() {
                return Guice.createInjector(
                  new MyShiroWebModule(servletContext),
                  new ShiroAopModule(),
                  new ServletModule(){
                        @Override
                        protected void configureServlets() {                            
                                
                            install(new JpaPersistModule("principalJpaUnit"));  // like we saw earlier.

                            filter("/*").through(PersistFilter.class);                   
                            
                            install(new InjectedRequestFactoryModule());
                            serve("/gwtRequest").with(InjectedRequestFactoryServlet.class);
                                                       
                            //shiro filter
                            filter("/*").through(GuiceShiroFilter.class);
                            
                        }
                       
                });
        }

}