[Solved]-Ctrl + Space not working for content assist on eclipse-eclipse

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.

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. :)

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.

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.

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

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

Earlier I was also facing the same issue : I just followed below steps :

1. Go to Windows --> Preferences --> Java --> Editor --> Content Assist --> Advanced --> select all Java & Java Type Proposals.

2. Click on Apply and close it.

3. Restart the eclipse.

To enable Ctrl+Space.

1. 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.

2. Eclipse --> Windows --> Preferences --> Java --> Editor --> Content Assist --> Advanced --> select all Java & Java Type Proposals.

3. 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.

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)

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.

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.