After I have switched my IDE from Eclipse Indigo to Eclipse Juno now inside the Java editor the possibility to mark all occurrences of a marked variable does not work any more. It does only work if I explicitly deactivate and activate again the proper symbol from the symbol bar. Usually that symbol once activated should mark all other variables and when setting the cursor to another variable the same should proceed. I don't want to do these steps manually by reset the symbol in the symbol bar. What is going on here? Eclipse Indigo did that without blaming.
This is a known issue with Eclipse Juno. I am having this issue with Eclipse Juno 4.2.2
Workaround: Switch to the Outline view, select something, and switch back to your file again. Mark occurrences should start working again (at least for a little while).