Projects in Project Browser are disappeared but remain in disk

Question

Every new day my projects are lost in project browser in eclipse-indigo but remain in disk, so I must import all projects again in every morning. Do you have any idea about this problem?

I can see all projects in ~/workspace/.metadata/.plugins/org.eclipse.core.resources/.projects

When I open the eclipse, the files which I worked one day ago, make an exception: org.eclipse.core.runtime.CoreException: The file does not exist.

Two days ago my eclipse crashed and this problem started probably after this time. Also I found these in error logs:

--> The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

--> Ignored attempt to add saveable that was already registered

--> Unable to create editor ID org.eclipse.jdt.ui.PropertiesFileEditor: The file does not exist.

Middlebreaker

Do you use working sets? Is it possible you are viewing a working set and projects are being removed from that. Check the view menu associated with the Project/Package Explorer and make sure the working set settings are as you like them. – Fredelia

@FrancisUpton No, I do not use a working set. – Middlebreaker

Open up your error log and look for relevant errors. Paste them above. You may want to just discard your current workspace and start over again (and re-import all your existing projects). – Gopher

Answer 1

Solution:
Shut down Eclipse IDE
Remove and backup your workspace/.metadata/.plugins/org.eclipse.core.resources directory

Start Eclipse IDE (with -clean to be super-safe) Reimport all projects (UPDATE: Just use File->Import->Existing Project into Workspace and browse your workspace/project directory) Enjoy

Source: http://ahtik.com/blog/2008/01/15/eclipse-workspace-fails-to-start-after-crash-quick-fix/

Middlebreaker