java.lang.NoClassDefFoundError: org/apache/spark/Logging

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/Logging
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:763)
        at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:467)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:73)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:368)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:362)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:361)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        at org.apache.spark.graphx.lib.ConnectedComponents$.run(ConnectedComponents.scala:50)
        at org.apache.spark.graphx.GraphOps.connectedComponents(GraphOps.scala:417)
        at tu.CommFriends$.main(CommFriends.scala:57)
        at tu.CommFriends.main(CommFriends.scala)
Caused by: java.lang.ClassNotFoundException: org.apache.spark.Logging
        at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
        ... 16 more

　　原因：版本不匹配

　　和spark相关的jar包要和spark-core 版本相同