在ServletContextListener上获取Spring应用程序上下文

Question

I am trying to get the spring application context on a ServletContextListener. I am using Spring with annotation configuration. Using this code i get "context null". What I am doing wrong?

@WebListener
public class Initializer implements ServletContextListener
{   
    public void contextInitialized(ServletContextEvent event)
    {
        System.out.println("context " + WebApplicationContextUtils.getWebApplicationContext(event.getServletContext()));
    }

    @Override
    public void contextDestroyed(ServletContextEvent sce)
    {
    }
}

Thanks

Answer 1

The key for fix the problem has been delete the annotation @WebListener and on WebAppInitializer override onStartup to ensure that the ContextLoaderListener is loaded before Initializer

public class WebAppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer
{
.
.
.
    @Override
    public void onStartup(ServletContext container) throws ServletException
    {
        super.onStartup(container);
        container.addListener(Initializer.class);
    }
}