Content Assist (Ctrl + Space) Is Not Working in Eclipse

Some times after updating your Eclipse Content Assist(Ctrl+Space) does not work. Means eclipse provide no proposal. There may be one of below two reasons of this issue.

1. Content Assist Configuration

Configure Eclipse’s content assist, go  Preferences>Java>Editor>Content Assist>Advanced Make sure Java Proposals is ticked 

2. Used by Other Application

Check if Ctrl+Space hot key combination is not used by any other Application. If so change that.