A SQL error has occurred in ServiceLocator.getDBConn()Cannot create PoolableConnectionFactory 解决方法

报错如下：

com.css.eshop.exception.ServiceLocatorException: A SQL error has occurred in ServiceLocator.getDBConn()Cannot create PoolableConnectionFactory (IO 错误: The Network Adapter could not establish the connection)
>>>>>>>>>>>>>>>> in loadFromDb type=countryprvnc
	at com.css.eshop.util.ServiceLocator.getDBConn(ServiceLocator.java:107)
	at com.css.eshop.util.LoadStaticReferenceTables.loadFromDb(LoadStaticReferenceTables.java:621)
	at com.css.eshop.util.LoadStaticReferenceTables.setPrvncCity(LoadStaticReferenceTables.java:235)
	at com.css.eshop.util.LoadStaticReferenceTables.<init>(LoadStaticReferenceTables.java:158)
	at com.css.eshop.listener.Initializer.contextInitialized(Initializer.java:25)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4792)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5256)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1420)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1410)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

原因：

是因为数据库连接不上，数据库得服务器挂掉了，换个数据库即可，或者查看数据库为什么连接不上。