All recent RightScale-published RIghtImages include Version 6 (Java 1.6) of the Java Development Kit (JDK).
You can verify the specific installed JDK version for a running server by executing the java -version command in an SSH session. This returns version information like the following:
java version "1.6.0_24" Java(TM) SE Runtime Environment (build 1.6.0_24-b07) Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode)
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