http://blog.csdn.net/stc89cxx/article/details/50503236
http://www.cnblogs.com/yukino/p/3945728.html
可能会报这个错误Cannot nest 'ss/src/main/java' inside 'ss/src/'. To enable the nesting exclude 'main/' from 'ss/src/';
点击改工程的Properties属性选中Java Build Path项,找到source,发现有两个错误的包,将其选中remove掉;