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My problem is that the content assist window won't pop up after clicking Ctrl + Space. I checked my shortcuts and the content assist is bound to Ctrl + Space. Sometimes the window automatically pops up making suggestion after typing dot e.g., but this won't happen when using the keys combination.
Eclipse version:
Eclipse Java EE IDE for Web Developers.
Version: Kepler Service Release 1 Build id: 20130919-0819
My OS is Ubuntu 12.04 if that matters.
Ctrl+space was not working in my eclipse.Somehow it got disabled.
I have tried many options and didnt worked any options.
Finally this was work out
Go to Preferences > Java > Editor > Content Assist > The "Auto activation triggers for Java:" field. Paste "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz." (note the dot after z) .This is the best solution and no need to even press ctrl+space.
It happened to me also, What I have done is change the workspace folder to Another folder and problem solved!
Though I have eclipse proposal settings configured properly it was not working for me. In my case Ctrl+space key combination was hijacked by another background running process (I was running AllwaysOnTop utility for windows). it worked after exit that process. :)
Go to Windows > Preferences > Java > Editor > Content Assist > Advanced > select all Java only. If you select all, then multiple occurrence of same instance would be shown in Suggestion list. which might be annoying some times.