在连接mysql时遇到的问题及解决（SSM）

在连接mysql时遇到的问题及解决（SSM）

** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
	at com.mysql.jdbc.Connection.createNewIO(Connection.java:2658)
	at com.mysql.jdbc.Connection.(Connection.java:1509)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
	at com.mchange.v2.c3p0.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:135)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:182)
	at com.mchange.v2.c3p0.WrapperConnectionPoolDataSource.getPooledConnection(WrapperConnectionPoolDataSource.java:171)
	at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool$1PooledConnectionResourcePoolManager.acquireResource(C3P0PooledConnectionPool.java:137)
	at com.mchange.v2.resourcepool.BasicResourcePool.doAcquire(BasicResourcePool.java:1014)
	at com.mchange.v2.resourcepool.BasicResourcePool.access$800(BasicResourcePool.java:32)
	at com.mchange.v2.resourcepool.BasicResourcePool$AcquireTask.run(BasicResourcePool.java:1810)
	at com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread.run(ThreadPoolAsynchronousRunner.java:547)

解决方法 1

1 直接用sql命令行修改

mysql> set global wait_timeout=1814400；
mysql> set global interactive_timeout=1814400；
#注：wait_timeout=1814400 = 21小时

查看超时时长

mysql> show global variables like 'wait_timeout'；

//该方法不推荐 ，服务重启修改会还原

解决方法2? 修改 my.ini文件( mysql安装目录bin文件夹下 )

打开my.ini文件

//搜索此项 [mysqld]
//添加下面两行,重启服务
wait_timeout=31536000  
interactive_timeout=31536000  

检查 url连接 ip ,端口占用,账号密码 ,如果是localhost 更改为IP

?jdbc:mysql://192.168.10.112:3306/test?useUnicode=true&characterEncoding=utf-8&autoReconnect=true


也可能是服务器宕机了。。。