Ctrl + Space not working for content assist on eclipse - eclipse

Question

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.

Answer 1

In my case;
Window>Preferences>Java>Editor>Content Assist>Advanced
Make sure Select the proposal>Template Proposals,SWT Template Proposals,Java Proposals ,Content assist cycling>Template Proposals,SWT Template Proposals,Java Proposals is ticked.

Answer 2

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.

Answer 3

I managed to fix it finally. The problem was that the ibus was overriding the shortcut so I deleted this shortcut configuration.
Type ibus in the dash:
Then select Keyboard Input Methods. From there click on the first three dots next to the Enable or disable textfield. This windows should appear:
If there is something bound to Ctrl + Space simply delete it.

Answer 4

For that Go to
Eclipse --> Windows --> Preferences --> Java --> Editor --> Content Assist --> Advanced --> select all Java & Java Type Proposals.
and check mark : Java Proposals(Code Recommenders)

Answer 5

To enable Ctrl+Space.
Go to Control Panel --> Region and Language --> select Keyboard and Languages tab --> Change Keyboard button --> select General tab --> Under Installed Services --> Remove all languages except English(United States). click apply and ok.
Eclipse --> Windows --> Preferences --> Java --> Editor --> Content Assist --> Advanced --> select all Java & Java Type Proposals.
Eclipse --> Windows --> Preferences --> General keys --> Type Content Assist in right side search box --> Select command Content Assist --> click on Restore To Default --> Apply --> ok
Now you are ready to use ctrl + space feature for content assist.

Answer 6

Earlier I was also facing the same issue : I just followed below steps :
Go to Windows --> Preferences --> Java --> Editor --> Content Assist --> Advanced --> select all Java & Java Type Proposals.
Click on Apply and close it.
Restart the eclipse.

Answer 7

For mac:
By default ˆ+space is assigned for switching inputs of the keyboard.
You can deselect that option by going to
System preference > Keyboard > Shortcuts > Input Sources
check for shortcut that using your key and disable it

Answer 8

It happened to me also,
What I have done is change the workspace folder to
Another folder and problem solved!

Answer 9

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.

Answer 10

This issue happened to me and none of the stack solutions seemed to resolve it. I finally figured that some other windows task was stealing my hotkey press. If nothing else works, I recommend that you downloaded a free software 'Windows Hotkey Explorer' that reported the registered hotkeys.
In my particular situation, I found ctrl+space was seized by 'blackboard collaborate' (a unpalatable java application for webcasts used by some of my courses).
I closed Eclipse killed all java processes (which included blackboard). Restarted eclipse and my autocomplete was back!
(Note: Hotkey Explorer was incredibly buggy and crashed every time I used it. I was able to get the information I needed before it crashed though so it was useful. Another (shareware) application that I didn't use but noticed online is: Hotkey Commander.

Answer 11

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. :)

Answer 12

I was facing the same issue. If you use OS X Eclipse Ctrl+Space shortcut can be interfering with OS X system's "Selecting previous input source" using Ctrl+Space shortcut as default.
It is necessary to edit System Preferencies/Keyboard/Shortcuts/Input Source and uncheck the "Selecting previous input source" or change the shortcut on something else. Eclipse should work after that even without restart.