Java EE Enterprise Application: perform some action on deploy/startup [duplicate]

Configure SerlvetContextListener and override contextInitilized()

in your web application description , web.xml

<web-app ...>
    <listener>
        <listener-class>com.someCompany.AppNameServletContextListener</listener-class>
    </listener>
</web-app

---

package com.someCompany;
import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class AppNameServletContextListener implements ServletContextListener{

    @Override
    public void contextDestroyed(ServletContextEvent arg0) {
        System.out.println("ServletContextListener destroyed");
    }

    @Override
    public void contextInitialized(ServletContextEvent arg0) {
        System.out.println("ServletContextListener started");   
                // do the things here 
    }
}