This error occurs since upgraded to Eclipse 4.3 (Kepler). If you perform the checkout with an old workspace (prior to Kepler) open, the checkout works fine
Trying to checkout from explorer view in Eclipse all users get a null pointer execption. This error occurs since we have upgraded to Eclipse 4.3 (Kepler).
Deselect the GIT option in Windows-> Preferences ->Team -> Ignored resources from the eclipse IDE.
This problem has been corrected in r12.5 release.