Eclipse project explorer can't be switched to the view on working sets
eclipse
Solution
You probably havent selected any working sets. In the drop down menu of the project explorer view, you have a menu item called `select working set...`. Go there and choose what working sets you want to see.
Problem
After "project explorer -> view menu -> top level elements -> working sets" being chosen, Eclipse doesn't switch the view from `projects` to `working sets` on `project explorer`. If `package explorer` is used instead, the change-over works fine. Why?