If your eclipse crashed and refuses to start, saying something along the lines of: Job found still running after platform shutdown. Jobs should be canceled by the plugin that scheduled them during shutdown, then try the following.
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$ rm -rf YOUR_PROJECT_DIR/.metadata/.plugins/org.eclipse.core.resources
Start eclipse. However, all your projects will be gone.
You can import them via File -> Import -> Existing Projects into Workspace; then select the directory where you had your projects.
EDIT: I just found a better way. (source)
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$ rm YOUR_PROJECT_DIR/.metadata/.plugins/org.eclipse.core.resources/.snap
This way you do not need to reimport your projects.
ANOTHER WAY:
As IGx89 suggested in the comments, you can also try the following:
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$ rm YOUR_PROJECT_DIR/.metadata/.plugins/org.eclipse.e4.workbench/workbench.xmi
http://stackoverflow.com/questions/11310970/eclipse-juno-doesnt-start/12045547#12045547