4回答

• 

  慕婉清9024742

  2020-05-31 23:18:02

  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 0
• 

  慕雪0535062

  2018-12-29 11:28:15

  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!

  
  

  3 0

  慕雪0535... 回复为了永无止境...

  <artifactId>mysql-connector-java</artifactId>这个包我就没改版本，让他使用自动的 <artifactId>c3p0</artifactId>这个包的版本我用的是<version>0.9.5.2</version>

  2019-01-07 17:08:21

  共 3 条回复 >

• 

  慕雪0535062

  2018-12-29 11:27:46

  改了也没有用啊，这个问题卡了好久，网上还说改jdbc.driver=com.mysql.jdbc.Driver,然后还是这个问题

  0 0
• 

  千层酥油饼

  2018-12-27 17:28:26

  已解决。

  1 0

  qq_北部湾...

  怎么解决

  2019-01-07 01:17:43

  共 1 条回复 >