Exception in thread "main" java.lang.NoClassDefFoundError: org/codehaus/jackson/map/JsonMappingException

        at org.apache.hadoop.mapreduce.Job$1.run(Job.java:563)

        at java.security.AccessController.doPrivileged(Native Method)

        at javax.security.auth.Subject.doAs(Subject.java:415)

        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)

        at org.apache.hadoop.mapreduce.Job.connect(Job.java:561)

        at org.apache.hadoop.mapreduce.Job.submit(Job.java:549)

        at org.apache.hadoop.mapreduce.Job.waitForCompletion(Job.java:580)

        at com.pzoom.mapred.WordCount.main(WordCount.java:40)

Caused by: java.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonMappingException

        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)

        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)

        ... 8 more

到你的下载的hadoop所在版本号的lib包中引入jackson-core-asl-1.8.8.jar   和   jackson-mapper-asl-1.8.8.jar  后错误消失

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