Hopefully simple question

[Manny Garcia]

I have a large-ish web app with a lot of moving parts. In particular I have a lot of cached data that doesn't get initialized until the first time a class is instantiated. My question is: Is there a way to set up a class with a method that will be called when the web app is started so that I can ensure that my cache is loaded before the first time someone wants to use it and perform any other start up tasks I'd like as well?

Regards,

Manny

[Paul Clapham]

And here I thought you had a question about web services!

If you want something to be done when your web application starts, just create a class which implements ServletContextListener and put your code into the contextInitialized method. Configure the name of that class into your web.xml in the appropriate place.

[Manny Garcia]

Holy cow Paul, that was easy! Thank you.

Regards,

Manny

Paul Clapham wrote:And here I thought you had a question about web services!

If you want something to be done when your web application starts, just create a class which implements ServletContextListener and put your code into the contextInitialized method. Configure the name of that class into your web.xml in the appropriate place.

[abani patra]

Hi,
One other way is to use java Spring API so that it will make ready your object before if needed.

[Kumaravadivel Subramani]

Hi,
There is another simply way to initiate a servlet by giving positive numbers for <load-on-startup></load-on-startup> in web.xml for particular servlet which one needs to initiated when the web application starts.

[Bear Bibeault]

Kumaravadivel Subramani wrote:
There is another simply way to initiate a servlet by giving positive numbers for <load-on-startup></load-on-startup> in web.xml for particular servlet which one needs to initiated when the web application starts.

That's a hack from the days before context listeners were added to the Servlet API. It's a poor practice to use servlets for application initialization in modern web apps.

[Manny Garcia]

All interesting ideas. Thanks folks.

Regards,

Manny