Running a Java background application on an application server

Question

My experience with application servers is limited by some basic coding for a servlet, so I'm not even sure how to ask this question correctly.

I need to write a java program that runs on the application server (java) and constantly executes a specific method (it checks files in a specific directory).

I found a way to schedule applications to start, but you need to know where to put the code, which I would usually put in the main () method in a regular java program.

Answer 1

You can use the Quartz , or EJB timer services (if you can learn EJB) for this task.

-, Tomcat, Quartz. , Quartz - .

, EJB EJB, EJB 2.1 .

Answer 2

, Spring , .

Answer 3

.

, ServletContextListener.

http://onjava.com/pub/a/onjava/2001/04/12/listeners.html

Answer 4

One way to do this is to write a Listener that implements the ServletContextListener, and you write that you plan your timer in the context of the Initialized method