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Failed to obtain JDBC Connection

nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database 碰到这个问题的同学，可以试试：

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.44</version>
</dependency>

加上版本号就可以了

千层酥油饼

2018-12-27

源自：SpringBoot+MyBatis搭建迷你小程序 3-6

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4 回答

慕婉清9024742
2020-05-31

我的是版本太新了，默认是

2.1.2.RELEASE 改为2.0.2.RELEASE 就好了

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
    <relativePath /> <!-- lookup parent from repository -->
</parent>

0 回复有任何疑惑可以回复我~

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慕雪0535062
2018-12-29

org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

### Error querying database. Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!

### The error may exist in file [E:\ideaworkspace\demo\target\classes\mapper\AreaDao.xml]

### The error may involve com.imooc.demo.dao.AreaDao.queryArea

### The error occurred while executing a query

### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database!