Github user myui commented on the issue:
https://github.com/apache/incubator-hivemall/pull/103
We cannot go Java 8 yet since the stable version of Hadoop still depends on
Java 7.
Better to keep minimum dependencies to Java 7 for Hivemall core module.
Also, `-target 1.7` is not supported in JDK 8.
https://stackoverflow.com/questions/21014338/can-you-compile-a-class-using-java-8-and-then-use-it-in-java-7
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