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Loading a file in a servlet at run time

Sonali Inamdar

Joined: Jul 13, 2004
Posts: 1

I have a simple servlet which reads an xml file in its init method.

This XML file has some name value pairs.

These are read in a hashmap in the init method.

This is a global hashmap which is used in the service method for some processing and logic building.

Without shutting down the servlet, if an admin changes this xml file which was read in the init method, how will I reload/refresh the hashmap at run time so that the newly added values can be used for the forthcoming requests.

William Brogden
Author and all-around good cowpoke

Joined: Mar 22, 2000
Posts: 12760
Put the code that reads the xml file in a separate method - called from init and also callable from other methods. If you grab the timestamp on the file when init reads it, it is pretty simple to compare the current file's timestamp with the one that corresponds to the hashmap data and decide whether or not to re-read the file.
I agree. Here's the link:
subject: Loading a file in a servlet at run time
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