Oracle (Sun) Java JRE has been removed from the repositories of openSUSE 12.1. License troubles....
openSUSE 12.1 Release Notes

However, should you still want it: I have written a how-to for manual installation of Oracle (Sun) Java JRE in openSUSE 12.1:
Oracle (Sun) Java for openSUSE - Easy Linux tips project

Installing should be quite easy now; just follow the instructions with precision.

Have fun, Pjotr.