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One user described this scenario. He had web app with JSP's, using Glassfish. 1) The app was deployed, 2) he edited one of the JSP's, 3) he would like to update the edited JSP only to the Glassfish. He provided that the step 3) is not supported by IDE (it is by Glassfish), one need to redeploy entire app instead.
This is already suported for webapp, with local gf with directory based deployment. With Compile on Save enabled it works in EAR too.