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

java 版本不对，导致报错

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/util/ByteUnit : Unsupported major.minor version 52.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:800)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        at org.apache.spark.internal.config.package$.(package.scala:41)
        at org.apache.spark.internal.config.package$.(package.scala)
        at org.apache.spark.SparkConf.validateSettings(SparkConf.scala:546)
        at org.apache.spark.SparkContext.(SparkContext.scala:373)
        at org.apache.spark.SparkContext$.getOrCreate(SparkContext.scala:2509)
        at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:909)
        at org.apache.spark.sql.SparkSession$Builder$$anonfun$6.apply(SparkSession.scala:901)
        at scala.Option.getOrElse(Option.scala:121)
        at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:901)
        at SparkSessionSingleton$.getInstance(SparkSessionSingleton.scala:18)
        at MergeParquetFileV4$.main(MergeParquetFileV4.scala:21)
        at MergeParquetFileV4.main(MergeParquetFileV4.scala)