A few days ago I was using autocomplete features and Ctrl-click without any problem.

But now those features don't work anymore: the autocomplete shows up but is always empty, and Ctrl-click doesn't work because Eclipse doesn't recognize the classes anymore.

This doesn't even work for a class or function or variable in the same file, so I guess this is not a configuration problem, but maybe a cache that is corrupted?


Try this:

  • Go to Preferences » Java » Editor » Content Assist » Advanced.
  • Make sure Other Java Proposals is ticked/checked

If that does not work simply "close" the project and reopen it.

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    That did the trick thank you ! I am using Eclipse for PHP, so I tried closing and reopening the project and it worked. Exactly what I was looking for thanks. – Matthieu Napoli Nov 11 '10 at 16:54
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    Kepler didn't have this turned on by default when I downloaded it for some reason – Jherico Jun 25 '13 at 21:59
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    +1 same thing. Kepler didn't have this turned on by default. Hopefully other people will come by and see this fix. ( Eclipse Kepler Turn On Content Assist AutoComplete Intellisense) – Daryl Teo Jul 6 '13 at 4:52
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    I dunno why Kepler doesn't have this on by default. That's a must for android dev. – noob Sep 20 '13 at 9:22
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    close/reopen worked for me. – simplfuzz Jun 5 '14 at 11:18

This was a tough one for me to solve (running Juno Version: 4.2.1 Build id: M20120914-1800 on Mac OSX 10.6.8).

The steps I had to take were:

  1. Run Help » Check for updates and then restart to get to the most recent version
  2. As noted above, Go to Preferences » Java » Editor » Content Assist » Advanced
  3. Click everything Java related in both sections
  4. Restart again

On ubuntu studio the ctrl-space was assigned at the operating system level to change the keyboard input method. I had to change the Next Input Method in Settings Manager–>Keyboard Input Methods–>Next Input Method field.

I changed it from ctrl-space to ctrl-alt-shift-space.

  • Thank you. I don't know who designed this but the choice of ctrl+space to change the keyboard input method is really dumb. – benji Aug 15 '16 at 23:29
  • this is solution is also applicable for Mac Os. go to System Preferences > Keyboard > Input Sources and untick that stupid control-space binding. – Kerem Baydoğan Apr 2 '18 at 22:46

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