Sometime Eclipse fails to work as expected. The following 'dances', in increasing order of desperation, may help. Remember to maintain a fixed grin throughout and try not to tread on your own toes.
Refresh and clean all projects ("Quickstep")
Click on a project in the Package Explorer. Hit Apple-A (or Ctrl-A) to select all projects. Hit F5 to refresh. Select Project->Clean..., select "Clean all projects", and click Ok.
Open and close all projects ("Foxtrot")
Click on a project in the Package Explorer. Hit Apple-A (or Ctrl-A) to select all projects. Right click the projects and select "Close Project". Right click the projects again and select "Open Project".
Open and close all projects restarting Eclipse in between ("Tango")
Click on a project in the Package Explorer. Hit Apple-A (or Ctrl-A) to select all projects. Right click the projects and select "Close Project". Restart Eclipse. Click on a project in the Package Explorer. Hit Apple-A (or Ctrl-A) to select all projects. Right click the projects again and select "Open Project".
Delete and re-import all projects ("Paso Doble")
Click on a project in the Package Explorer. Hit Apple-A (or Ctrl-A) to select all projects. Press the delete key, select "Do not delete contents", and click Ok. Right click in the Package Explorer and select Import..., then choose General and "Existing Projects into Workspace" and click Next. Browse to select the platform checkout directory and click Choose. Select all the projects for import. Click Finish.
Rebuild the search indices ("Slow Waltz")
Exit the workbench and delete the Java search index:
- go into \plugins\.metadata\.plugins\org.eclipse.jdt.core
- delete 'savedIndexNames.txt'
- delete all *.index
Restart
If all else fails
If you're still stuck, try the "Hokey Cokey" by repeating all of the above until you've had enough.