I believe Raspbian includes Minecraft, which requires an Oracle version of Java.
We don’t include Oracle Java because it’s non-free, and Debian doesn’t include it either. And we don’t include any variant of Java by default as there is no need for it in OSMC. There’s a perfect alternative – OpenJDK, which is available.
The only thing to be aware of is you may need to keep the Oracle version of Java up to date manually. Copying a new version over the old should be good enough.