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This is one of your projects that is causing the problem you will probably have to identify, one of them that is causing the error java.lang.NullPointerException, this error is very Generic, it can be anything you have done, but usually it is when trying to pass a null variable to a specific method, like trying to use File and pass null in the file name.
You can try "clean mode":
c:\ecplise\eclipse.exe -clean
I still recommend that you review all your projects, or a lib or one of them must be causing the message.

Try the command on cmd like this
c:\ecplise\eclipse.exe -clean(change c: eclipse to your installation folder)– Guilherme Nascimento