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.
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.