java.lang.ClassNotFoundException: com.hadoop.WordCount$Map

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java.lang.RuntimeException: java.lang.ClassNotFoundException: com.xtj.hadoop.WordCountNew$Map        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:857)        at org.apache.hadoop.mapreduce.JobContext.getMapperClass(JobContext.java:199)        at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:718)        at org.apache.hadoop.mapred.MapTask.run(MapTask.java:364)        at org.apache.hadoop.mapred.Child$4.run(Child.java:255)        at java.security.AccessController.doPrivileged(Native Method)        at javax.security.auth.Subject.doAs(Subject.java:415)        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1190)        at org.apache.hadoop.mapred.Child.main(Child.java:249)Caused by: java.lang.ClassNotFoundException: com.xtj.hadoop.WordCountNew$Map        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)        at java.lang.Class.forName0(Native Method)        at java.lang.Class.forName(Class.java:274)        at org.apache.hadoop.conf.Configuration.getClassByName(Configuration.java:810)        at org.apache.hadoop.conf.Configuration.getClass(Configuration.java:855)        ... 8 more

解决办法：

使用eclipse export打成jar包的时候，

要选择第一项：Extract required libraries into genetrate JAR

如果选择第二项：Package required libraries into genetrate JAR 就会报上面的错误。

原因还未搞懂，还请知道的告知一下。

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