com.mysql.jdbc.CommunicationsException: The driver was unabl

mysql異常：

 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.

由拋出的異常可以推斷出：是用戶端不斷的查詢資料庫所導致的；

解決方案：檢查資料庫表查詢的方法，查看是否有方法不斷的調用工具類並建立串連查詢資料庫嗎，導致了串連數量過多 ；