【文章推荐】Could not obtain connection to query metadata : An attempt by a client to checkout a Connection has timed out.]

原文：Could not obtain connection to query metadata : An attempt by a client to checkout a Connection has timed out.]

hibernate c p 配置： lt xml version . encoding UTF gt lt beans xmlns http: www.springframework.org schema beans xmlns:xsi http: www.w .org XMLSchema instance xmlns:context http: www.springframework.org s ...

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log报错： Caused by: java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.

报错：解决方式： 1、登录数据库查看错误原因结果发现账号无法正常登录出现账号被锁定的错误。 2、如何账号解锁？用sys系统管理员账号登录数据库 SQL> alter u ...

c3p0连接错误 An attempt by a client to checkout a Connection has timed out.

问题http://chembo.iteye.com/blog/905233 mysql最大连接数设置 http://zhidao.baidu.com/link?url=8YXlt73Ktr6pRD ...

报错： Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: An attempt by a client to checkout a Connection has

解决方法一： [oracle@data ~]$ sqlplus / as sysdba——连接到数据库 SQL*Plus: Release 11.2.0.4.0 Production o ...

to checkout a Connection has timed out.

本人今天新部署在UAT环境的war包,一直进不去系统，但是tomcat服务器（ip:8080）是能进去的，查询日志为： Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while ...

mysql数据库连接出问题，提示超时 java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.解决办法

mysql数据库连接出问题，提示超时，后来发现问题在于连接mysql数据库的jar包跟数据库版本不对应导致的，更换jar包一致就解决了。 ...

c3p0出现 An attempt by a client to checkout a Connection has timed out

java.sql.SQLException: An attempt by a client to checkout a Connection has timed out. at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java ...

Could not obtain connection metadata

...

配置c3p0连接池出现错误：java.sql.SQLException: An attempt by a client to checkout a Connection has timed

mysql是8版本的，在学习c3p0链接池配置的时候出现了一些问题,记录一下错误.. 刚开始出现的是这个错误：java.lang.NoClassDefFoundError: com/mchange ...

原文：Could not obtain connection to query metadata : An attempt by a client to checkout a Connection has timed out.]

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