Currently, I did some practise about Hadoop and met some erorrs. Like this, I can run the Hadoop application with terminal on HDFS, but I cannot run it locally with eclipse for following errors:
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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 |
The reason is that I did not import right jar package, so after import jackson-core-asl-version.jar and jackson-mapper-asl-version.jar in path hadoop/client-0.20 I can run it correctly.