I'm trying to change the port this server runs on via eclipse but no matter what I do it doesn't seem to autocompile/autocomplete my java file? Any ideas?
For auto-build, go to Project->Build Automatically. Build automatically should be checked for auto build to happen.
For auto-complete(content assist) go to Windows->Preferneces. In there follow Java->Editor->Content Assist int he left tree and configure as you feel like.