Closed projects in Eclipse don't appears in a working set in a package explorer

Question

I recently installed a new version of eclipse (2018-09), and faced with this problem. So let say we have 4 opened projects A,B,C and D: 4 projects

And then we create new working set WS_01 with: View Menu (down arrow icon in package explorer) > Select working set... > New... > Java > Finish. And we add projects A and B in that set.

Then, if I select View Menu > WS_01, package explorer will show only projects A and B. The problem is, if I close project B, it will disappears from explorer. Even if I unchecked option Closed projects from View Menu > Filters ... , project B will be still missing.

But if I go back to View Menu > 1_Windows_working_set, then I can see closed folder of project B: project B is closed

Answer 1

This looks like a bug in the Package Explorer of Eclipse 2018-09: see Eclipse bug 538216

You can use one of the following as workaround for this bug:

• Use the Project Explorer instead of the Package Explorer
• In the Package Explorer view menu choose Top Level Elements > Working Sets