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I'm trying to register a servlet using servletContainerInitializer but it doesn't seem to work, Maybe it's my code (kindly review it), but I came to wonder about the difference between ServletContainerInitializer and ServletContextListener , because the follwing code runs fine when used as ServletContextListener instead. From servlet 3.0 specification: 4.4 Configuration methods (adding servlets dynamically): ... or from the onStartup method of a ServletContainerInitializer implementation ... The ServletContainerInitializer : package com.marmoush.javaexamples.nullhaus.servlet; import java.util.Set; import javax.servlet.ServletContainerInitializer; import javax.servlet.ServletContext; import javax.servlet.ServletException; import javax.servlet.ServletRegistration; public class MyInit implements ServletContainerInitializer { public void onStartup(Set<Class<?>> c, ServletContext ctx) throws ServletException { System.out.println("hello"); ServletRegistration reg = ctx.addServlet("q31","com.marmoush.javaexamples.nullhaus.servlet.Q31"); reg.addMapping("/q31/*"); } } The servlet which I'm trying to auto-register: package com.marmoush.javaexamples.nullhaus.servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class Q31 extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse

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