Is there a way to run a method/class only on Tomcat/Wildfly/Glassfish startup?

Question

I need to remove temp files on Tomcat startup, the pass to a folder which contains temp files is in applicationContext.xml.

Is there a way to run a method/class only

Answer 1

You could write a ServletContextListener which calls your method from the contextInitialized() method. You attach the listener to your webapp in web.xml, e.g.

   my.Listener

and

package my;

public class Listener implements javax.servlet.ServletContextListener {

   public void contextInitialized(ServletContext context) {
      MyOtherClass.callMe();
   }
}

Strictly speaking, this is only run once on webapp startup, rather than Tomcat startup, but that may amount to the same thing.