glassfish v3 and java EE in production mode: what are the options to update a live web app?

I am building a web app using java EE and glassfish v3. I want to move it to production mode soon, however i have zero experience with using glassfish in production, i would appreciate if you give me some guidance about how to approach the following scenario:

say i have deployed the web app using admin console pointing to the .war file. But what if i want to update this live application, do i need to :

a) undeploy --> build new war file (with updates) --> paste the war file to the app folder -->redeploy?

b) move in only the changed files , ie : .class files , jsp, etc... without undeploying before?

Solution 1:

Personally I use a maven plugin and a tool similar to jenkins to do my deploys to production but you can always do it by hand like this:

1. Open the admin console (by default it's bound to port 4848)
2. Choose "Applications" on the menu
3. Next to the application you want to redeploy there should be a link labeled "Redeploy", click it.
4. Choose new war (and options related to precompiling jsp's and stuff)
5. Press OK

The new version of the application should be deployed after this process.

Hope this helps.