In eclipse, when exporting a web project to war/ear file there is this option
"Optimize for a specific server runtime"
What does happen under the hood when this option is selected? Couldn't find an explanation about that so far.
I am running Eclipse Indigo 3.7.
Eclipse itself doesn't do anything with that option. What happens is dependent on a particular server adapter. Many of the adapters don't do anything with this option either, but they might in the future.
If a server adapter does support export optimization, it has the option of displaying custom options beneath that pop-up list of runtimes, so that's a good cue to use to see if something will actually happen.
For instance, when targeting WebLogic Server, you will see this:
maybe pre-compiles JSPs - this is the first typical thing to do=) ?
来源：https://stackoverflow.com/questions/11759784/eclipse-war-export-optimize-for-a-specific-server-runtime