I did at one time configure my Eclipse/Project not to include classes from java.awt when activating content assist (Ctrl+Space).
Now I want to include content from java.awt again but I can't remember where I edited the list of classes to ignore, no I can't remove java.awt from the list to ignore. Anyone who know where that feature is in eclipse 3.7
Open the Preferences dialog. Search for ignore.
This is the tree path:
Preferences > Java > Appearance > Type Filters