How to Execute a Class when server is Starting

Question

I have a Dynamic webproject created in eclipse with Glassfish server, I want to execute a specific class automatically when the server get started. That class has a listener that listens to a JMS queue, How can I achieve this? Do I have to configure it in web.xml? If so how to do it? Any code example would be really appreciated.

score 3 · Accepted Answer · answered Jun 02 '14 at 06:37

There are alot of ways to achieve this. You can make a Startup EJB Singleton. Something like this:

@Singleton
@Startup
public class MyStartupBean {
    @PostConstruct
    private void init() {
        LOG.info("Initializing startup bean");
        // Do stuff
    }
}

score 1 · Answer 2 · answered Jun 02 '14 at 06:35

as a solution you can have a class which implements javax.servlet.ServletContextListener and register it in your web.xml

 <listener>
        <listener-class>YourListener</listener-class>
    </listener>

ServletContextListener has two methods:

public void contextInitialized ( ServletContextEvent sce );
public void contextDestroyed ( ServletContextEvent sce );

so this class run automatically when your web project starts If you don'e want to change your JMS listener class you can call it's appropriate method from another context loader class like what I said.

How to Execute a Class when server is Starting

2 Answers2