Shanghai Daniel is about »
Preferences > Java > Editor > Content Assist > Advanced'.
But for me, it seems that something's wrong with my workspace configurations too. The answer from hoipolloi in following reference post helped me to fix this issue. Here's his suggestion:
- Quit Eclipse
- Go to workspace/.metadata/.plugins/org.eclipse.jdt.core
- Remove *.index and savedIndexNames.txt
- Restart Eclipse and search Ctrl+T for the offending type. The indexes will be rebuilt.