Java Applications and Spaces don’t work well together
Spaces is great. Except that it does not work with Java applications. Try to start IDEA or JConsole and you will notice that command-tabbing to that application will not active the space that it is on. It is also not possible to give Java applications a fixed spaces: you can select for example IDEA.app or NetBeans.app in the Spaces Preferences but it will not be added to the ‘Application Assignments’ list. Lame.