OpenJDK built in Ubuntu 12.10, but not working?

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http://askubuntu.com – I recently installed Ubuntu 12.10, and I just now realized I haven't installed Java on it. When I was going to, I saw that I already have java installed. java -version gives me: OpenJDK Runtime Environment (IcedTea7 2.3.7) (7u15-2.3.7-0ubuntu1~12.10) OpenJDK 64-Bit Server VM (build 23.7-b01, mixed mode) Yet I can't see any applets in Firefox. What's the problem? (HowTos)