我猜您是Windows用户，在Windows XP及更高版本中文件路径限制为8191.

I guess you are the windows user, there is a file path limit of 8191 in Windows XP and above.

http://support.microsoft.com/kb/830473/zh-CN

这是缩短文件路径的最简单方法，例如将项目文件夹更改为D:\，并引用您的项目路径，并始终使用ASCII字符作为文件夹名称. UTF-8字符使用2-3个字节. 或转移无用的依赖. 或更改为MAC平台. ;)

The simplest way this shorten the file path, like change the project folder into D:\, and refact your project path, and always use ASCII chars for the folder name. UTF-8 chars use 2-3 bytes. or move useless dependency. or change to MAC platform. ;)

原因是在编译步骤，有一个类似javac xxxx的命令，将所有依赖项的路径合并在一行中.

The reason is at the compile step, there is a command like javac xxxx, combine all dependences's path in one line.