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将作业从 java 7 迁移到 8 后，即使编译成功，也会出现以下错误。

编译时使用了相同版本的java，即java 8，运行时使用了相同的版本。所以通常java的版本应该有任何不匹配。甚至scala版本都是一样的。

Failing Oozie Launcher, Main class [org.apache.oozie.action.hadoop.JavaMain], main() threw exception, java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
org.apache.oozie.action.hadoop.JavaMainException: java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
        at org.apache.oozie.action.hadoop.JavaMain.run(JavaMain.java:59)
        at org.apache.oozie.action.hadoop.LauncherMain.run(LauncherMain.java:51)
        at org.apache.oozie.action.hadoop.JavaMain.main(JavaMain.java:35)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.oozie.action.hadoop.LauncherMapper.map(LauncherMapper.java:242)
        at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:54)
        at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:453)
        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:343)
        at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:168)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
        at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:162)
Caused by: java.lang.NoSuchMethodError: scala.Predef$.ArrowAssoc(Ljava/lang/Object;)Ljava/lang/Object;
        at com.twitter.scalding.RichXHandler$.<init>(XHandler.scala:38)
        at com.twitter.scalding.RichXHandler$.<clinit>(XHandler.scala)
        at com.twitter.scalding.Tool$.main(Tool.scala:152)
        at com.twitter.scalding.Tool.main(Tool.scala)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.apache.oozie.action.hadoop.JavaMain.run(JavaMain.java:56)
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