【JavaWeb:c3p0配置问题-----java.sql.SQLException: Connections could not be acquired from the underlying database!】的更多相关文章

JavaWeb:c3p0配置问题-----java.sql.SQLException: Connections could not be acquired from the underlying database!

错误原因 c3p0的配置错误 错误显示 -classpath "D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\lib\idea_rt.jar;D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\plugins\junit\lib\junit-rt.jar;D:\Program\Software\IntelliJIDEA\IntelliJ IDEA 2018.2.5\plu…

数据库连接问题之：Caused by: java.sql.SQLException: Connections could not be acquired from the underlying database!

要么是驱动问题(没加载到工程中去或者其他问题)要么是账号密码或者url或者driver写错 driver:com.mysql.jdbc.Driver url:jdbc:mysql://localhost:3306/数据库名称…

dea创建Maven工程用c3p0连接数据库报错java.sql.SQLException: Connections could not be acquired from the underlying

idea   java.sql.SQLException: Connections could not be acquired from the underlying database! 转载自:https://blog.csdn.net/iXinRu/article/details/82624112 把c3p0-config.xml放到resources下面即可…

【JDBC 报错】Connections could not be acquired from the underlying database!

项目启动报错: [2016-07-13 10:04:15,074] ERROR org.apache.ibatis.executor.BaseExecutor Could not get a databaseId from dataSource java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLExce…

Connections could not be acquired from the underlying database!

Connections could not be acquired from the underlying database! 报错截图: 报错内容: Exception in thread "main" java.sql.SQLException: Connections could not be acquired from the underlying database! at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.…

c3p0：Connections could not be acquired from the underlying database!解决方案

在利用ssh框架做网站的时候遇到了一个比较棘手的问题,一直连接不上数据库,问题描述如下: 各种百度然后说的最多的解决方案是: 1,驱动配置有误:2,数据库连接地址有误:3,密码或帐号有误: 4,数据库未启动或无权访问: 5,项目未引入对应的驱动jar包: 但是我在检查我的项目的时候还重点看了这5点,就是没有啥问题,最后把最可能出错的数据库连接地址和账号密码重新编辑了一下就可以正常访问到了,可能是我在编辑数据库连接以及账号密码的时候多了空格以及数据库连接中的冒号没有使用英文冒号所致的.…

Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connectio

严重: StandardWrapper.Throwableorg.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!…

maven+springmvc出现：java.sql.SQLException: Unknown system variable 'query_cache_size'

连接mysql时一直出现以下的错误: org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception…

Javaweb项目中出现java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone.异常

javaweb项目中java.sql.SQLException: The server time zone value '�й���׼ʱ��' is unrecognized or represents more than one time zone. 异常,如下图: 服务器时区值“????±××?±?无法识别或代表一个以上的时区.如果希望利用时区支持,则必须配置服务器或JDBC驱动程序(通过serverTimezone配置属性)以使用更具体的时区值. 修改从c3p0-config.xml配置文…

JavaWeb报错：java.sql.SQLException: Invalid value for getInt()

1.错误描述:在对数据库进行操作时,控制台报错:java.sql.SQLException: Invalid value for getInt() :2.错误原因:数据库中表的字段的类型与实体类中属性的类型不一致3.解决方法:实体类中属性的类型应与数据库中表的字段的类型一致.例如:数据库表中字段类型为varchar,则实体类中应为String…