Sometime Ctr + space doesn't work in eclipse

When I was trying to build a simple DFS service client, I encounter the ctr + space combination was not showing any suggestion in eclipse.

In order to fix this issue we have to do Content Assist Configuration

Configure Eclipse’s content assist, go Preferences > Java > Editor > Content Assist > Advanced.
 Make sure “Other Java Proposals” is checked


Reference:
http://www.mkyong.com/java/content-assist-ctrl-space-is-not-working-eclipse/

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