org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection； nested

HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
type Exception report

message Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:

description The server encountered an internal error that prevented it from fulfilling this request.

exception

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is 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: Access denied for user 'root'@'localhost' (using password: YES)
### The error may exist in com/bjsxt/mapper/UserMapper.java (best guess)
### The error may involve com.bjsxt.mapper.UserMapper.selUserByNamePwd
### The error occurred while executing a query
### Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
	org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014)
	org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
	org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
### Error querying database.  Cause: org.springframework.jdbc.CannotGetJdbcConnectionException: Failed to obtain JDBC Connection; nested exception is java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)

错误代码块：

 
    
      mysql
      mysql-connector-java
      ***5.1.23***
    

错误原因：
jar包版本太高
我用的是version：8.0.19
Mysql8.0数据库连接：com.mysql.cj.jdbc.Driver

解决：
降低连接的版本数据
5.0版本使用com.mysql.jdbc.Driver
version：5.1.23