Try to delete all Eclipse indexed names in the following way:

1. Go to folder workspace/.metadata/.plugins/org.eclipse.jdt.core
2. Remove all *.index files and savedIndexNames.txt
3. Restart Eclipse

The recommendations were provided by Mike Schrag and the whole trace can be found here

Try to delete all Eclipse indexed names in the following way:

1. Go to folder workspace/.metadata/.plugins/org.eclipse.jdt.core
2. Remove all *.index files and savedIndexNames.txt
3. Restart Eclipse

The recommendations were provided by Mike Schrag and the whole trace can be found here.