java.lang.ClassNotFoundException: 自己编译WordCount编译通过

1、使用WordCount源代码，修改其Map，在Map中使用IKAnalyzer的分词功能。源码参照：

http://www.cnblogs.com/jiejue/archive/2012/12/16/2820788.html

2、打包上传到Hadoop集群，每台机器都上传，上传时包含了所有相关的jar，放到一个目录下

3、按如下两种方式执行都报错

[hadoop@master wordcount]$ /opt/modules/hadoop/hadoop-1.0.3/bin/hadoop jar ChineseWordCount.jar /user/root/hadoop/ /output6Exception in thread "main" java.lang.ClassNotFoundException: /user/root/hadoop/at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Unknown Source)at org.apache.hadoop.util.RunJar.main(RunJar.java:149)[hadoop@master wordcount]$ /opt/modules/hadoop/hadoop-1.0.3/bin/hadoop jar ChineseWordCount.jar ChineseWordCount/user/root/hadoop/ /output6Exception in thread "main" java.lang.ClassNotFoundException: WordCountat java.net.URLClassLoader$1.run(Unknown Source)at java.net.URLClassLoader$1.run(Unknown Source)at java.security.AccessController.doPrivileged(Native Method)at java.net.URLClassLoader.findClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at java.lang.ClassLoader.loadClass(Unknown Source)at java.lang.Class.forName0(Native Method)at java.lang.Class.forName(Unknown Source)at org.apache.hadoop.util.RunJar.main(RunJar.java:149)

4、解决办法：ChineseWordCount增加命名空间；~~~都是默认示例惹的祸，默认示例[hadoop@master hadoop-1.0.3]$hadoop jar hadoop-examples-1.0.3.jar wordcount /user/root/hadoop/ /output5 执行成功。

正确执行命令：[hadoop@master wordcount]$ /opt/modules/hadoop/hadoop-1.0.3/bin/hadoop jar ChineseWordCount.jar org.apache.hadoop.examples.ChineseWordCount /user/root/hadoop/ /output6

人总是珍惜未得到的，而遗忘了所拥有的