[ubuntu] Cannot play minecraft :(

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http://ubuntuforums.org – Hello, i cannot play minecraft on my 12.10 ubuntu. when i try to open the game i get the error: no JVM could be found on your system. But when i open termial and type: java -version it comes up: java version "1.7.0_09" OpenJDK Runtime Environment (IcedTea7 2.3.3) (7u9-2.3.3-0ubuntu1~12.10.1) OpenJDK Server VM (build 23.2-b09, mixed mode) (Hardware)