Java – is there a way to run methods / classes only when Tomcat / wildfly / GlassFish starts?

I need to delete the temporary files during Tomcat startup and transfer them to the folder containing the temporary files, which is located in ApplicationContext XML

Is there a way to run methods / classes only when Tomcat starts?

Solution

You can write a servletcontextlistener that calls your method from the contextinitialized () method You attach listeners to the web Webapp in XML, for example

<listener>
   <listener-class>my.Listener</listener-class>
</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 when webapp starts, not Tomcat starts, but this may be the same