java.util.concurrent.RejectedExecutionException 问题
http://www.cnblogs.com/fotransit/archive/2013/04/17/3025937.html
http://qingfeng825.iteye.com/blog/1670511
http://blog.sina.com.cn/s/blog_6145ed81010143l8.html
http://yaozhiqiang109.iteye.com/blog/1137579