When I want to see implementation of some interface through F4 (type hierarchy) or ctrl+t (quick hierarchy) or implementation of a method, I can't see it! Problem is, that it works in 90%, but I have few cases when interface and implementation are in same package and eclipse doesn't recognize it via type hierarchy. Any suggestions? Got Eclipse Indigo SR2.
I had this same problem and fixed it by deleting the Eclipse index cache files located in .metadata/.plugins/org.eclipse.jdt.core. Delete all .index files and savedIndexNames.txt. Do this while Eclipse is not running and then restart. This fixed the issue for me.
Use Eclipse clean mode for deleting caches, look here: How to run eclipse in clean mode? and what happens if we do so?
Sometimes is good to use clean mode to prevent these types of problems.
I also had this problem and fixed it. The reason of this problem is that when the eclipse is running, I reinstall the JDK from 1.8 to 1.6. So I close eclipse, install JDK 1.8 again, then it's OK! May it will be helpful for others.
来源：https://stackoverflow.com/questions/16354028/eclipse-type-hierarchy-not-always-working