Github user doanduyhai commented on the pull request: https://github.com/apache/incubator-zeppelin/pull/658#issuecomment-173000019 @felixcheung I create this PR because Cassandra server version 3.0 is using Java 8. Right now, some of the features of the Cassandra interpreter cannot be tested because it requires pulling the server and so requires using Java 8 for the integration test. In general, all the drivers that work at client side are still staying under Java 7 or even Java 6. But on the server side, it's not a problem to ask for Java 8 (because officially Java 7 is no longer supported). Since Zeppelin is a server technology, it's not that a big deal. However it's not an urgent matter, so I'm fine if we do not switch to Java 8 right now. Maybe we need some feedback from the community
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