Originally Posted by email@example.com
thanks for you reply i am using Oracle Linux 4 (Intel 64-bit, Developer).
That's not going to work, that version is too old.
Besides the fact that you cannot install Jdeveloper version 12.1.2, running such and old unsupported Linux version isn't the way to go (security risk, outdated package etc, etc). I would strongly advise to update to a recent version (which seems to be 6.4 atm).