DISCLAIMER: THIS WILL DELETE ALL OF YOUR ECLIPSE WORKSPACE SETTINGS AND YOU WILL HAVE TO RE-IMPORT ALL YOUR PROJECTS, THERE ARE LESS DESTRUCTIVE ANSWERS HERE
Try the following:
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Delete the .metadata folder in your local workspace (this is what worked for me). It seems that it contains a .LOCK file that if not properly closed, prevents eclipse from starting properly. On Unix based systems you can type following on command line;
rm -r workspace/.metadata
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Delete your .eclipse directory in your home directory. Launch eclipse. If that doesn’t work,
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Open eclipse under another user account. If it loads, you know the problem is with your account, not your eclipse installation.