eclipse: cannot load workspace

Question

I try to give you a summary of what happened. [...] means that passed some time.

• OS is Linux
• all was working fine
• [...]
• every time I started eclipse I needed to switch workspace even if there was only default workspace in the list of workspaces
• [...]
• I added build.xml following an Ant tutorial to one of my projects
• When I ran it using Ant, it ran out of memory. I turned off eclipse.
• When I restarted eclipse, once switched to correct workspace each of my open files reported: Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.javaeditor.CompilationUnitEditor.
• package explorer says: Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart.

What's happened? How can I restore it?

Answer 1

I resolved the problem by manually removing build.xml from project folder and restarting eclipse. Hope this helps.

EDIT: after restarting Linux the problem reappeared.

WORKAROUND: The problem seems to happen after an incorrect shutdown. I found this workaround:

• close eclipse
• restart OS (not sure if is needed)
• manually cut the folder of the project opened in eclipse when incorrect shutdown happened and temporary past it outside workspace (i.e. on desktop)
• restart eclipse
• close eclipse
• restore the project folder into workspace
• restart eclipse

Answer 2

I answered a similar problem but in Windows in this Question: "Plug-in org.eclipse.jdt.ui was unable to load class org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart." issue in adt ( v22.6.2)

Maybe this will help others.