com.mysql.jdbc.CommunicationsException: The driver was unable to create a connection due to an inability to establish the client portion of a socket. This is usually caused by a limit on the number of sockets imposed by the operating system. This limit is usually configurable. For Unix-based platforms, see the manual page for the ‘ulimit‘ command. Kernel or system reconfiguration may also be required.
由抛出的异常可以推断出：是客户端不断的查询数据库所导致的；
解决方法：检查数据库表查询的方法，查看是否有方法不断的调用工具类并创建连接查询数据库吗，导致了连接数量过多 ；
com.mysql.jdbc.CommunicationsException: The driver was unable to create a connection......
原文：http://blog.csdn.net/zhjw009/article/details/19048585