hadoop出現ava.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonMappingException

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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

到你的下載的hadoop所在版本號碼的lib包中引入jackson-core-asl-1.8.8.jar   和   jackson-mapper-asl-1.8.8.jar  後錯誤消失

hadoop出現ava.lang.ClassNotFoundException: org.codehaus.jackson.map.JsonMappingException