How to run some code when java servlet is deployed on Tomcat server?

Question

I have simple Servlet:

@WebServlet(urlPatterns = { "/doCourseRegister" })
public class DoCourseRegisterServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
.....
}

I need to run some code when servlet is first created(or deployed) on Tomcat server. How to do it?

Should I use servlet constructor?

Answer 1

You can add a listener in web.xml.

<listener>
    <listener-class>Your class</listener-class>
</listener>

Your class should implement HttpSessionListener .