Unsupported major.minor version 49.0异常详解
Unsupported major.minor version 49.0错误详解见：http://dev.firnow.com/course/3_program/java/javajs/2
Unsupported major.minor version 49.0错误详解
见：http://dev.firnow.com/course/3_program/java/javajs/20090304/157646.html
