Java: reload servlet configuration

To reload servlet configurations, you simply need to implement the ServletContextListener interface.
Example:

package utils;

import javax.servlet.*;

public class MeuListener implements ServletContextListener {

  public MeuListener() {}

  public void contextInitialized(ServletContextEvent event) {
    ServletContext sc = event.getServletContext();
    sc.setAttribute("seu atributo", "seu valor");
    ...
  }

  public void contextDestroyed(ServletContextEvent servletcontextevent) {}
}

Thus, we can, for example, reload configurations without needing to stop the application.