在搭建好Hadoop Eclipse开发环境后，编写map-reduce，遇到如下的问题：

从字面上可以看出，工程缺少org.apache.commons.cli.Options，这个包被间接的被其他包使用，根据经验推断，这个应该是缺少$HADOOP_HOMT/lib下的某一个包，通过不断的尝试，发现是缺少了commons-cli-1.2.jar包，

通过Java Build Path设置后，恢复正常。

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