see the SUSE lifetime documentation
http://en.opensuse.org/Lifetime
OpenSUSE 11.4 is DEAD
OpenSUSE 12.1 is DEAD
Opensuse 12.2 IS DEAD
install a supported version
OpenSUSE 12.3 has only about 140 days of support left
and Opensuse 13.1 is the current
you will NOT be able to install netbeans8 or jdk8 on the java6 11.4
install 13.1
and read the novell suse wiki
OpenJDK is already installed
if you want to switch off the Opensource "openJDK" to Oracles JAVA you need to cahngs the system DEFAULT
http://en.opensuse.org/SDB:Installing_Java