org/apache/spark/network/util/ByteUnit : Unsupported major.minor version 52.0

java 版本不对,致使报错java 2018-06-28 08:02:04,475 : INFO : SparkContext : logInfo : Running Spark version 2.2.0 Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/spark/network/uti
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