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Failed to obtain JDBC Connection

nested exception is java.sql.SQLException: Connections could not be acquired from the underlying database 碰到這個問題的同學，可以試試：

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

加上版本號就可以了

千層酥油餅

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，默認是

2.1.2.RELEASE?改為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 回復有任何疑惑可以回復我~

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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!