Hi I am using WebSphere4.0 AEs.I want to load a class as soon as server starts up. In there any option for that. For example in weblogic server admin console there is one option called startup and shutdown. There you can specify the class which you want to load.Is there any option in WebSphere? Help needed. Thanks Sumona
/ JeanLouis<br /><i>"software development has been, is, and will remain fundamentally hard" (Grady Booch)</i><br /> <br />Take a look at <a href="http://www.epfwiki.net/wikis/openup/" target="_blank" rel="nofollow">Agile OpenUP</a> in the Eclipse community
WebSphere has a similar feature, called as Custom Services. But unlike WebLogic, in which you can give any arbitrary class file with a main() method, the custom service in WebSphere *has* to implement a specific interface. When the application server starts up, it will call a particular method on your class. Search the WebSphere docs for specifics on this. However you must be careful in using this WebSphere feature. WebSphere makes no guarantee about the order in which this custom service will be called. Also there is no guarantee that any app-server services (eg, JNDI naming service, Connection Pools) will be fully initialized when your custom service is called. So if your custom class needs to lookup, say a JNDI reference, it may not be available! As someone else suggested, the cleanest way is to implement a startup servlet, which simply calls your custom class within the init() method. Using this approach, it is guaranteed that the app-server services will be fully initialized by the time the servlet is loaded.