java.sql.SQLException: Access denied for user 'root'@'localhost' (using password: YES)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:129)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:833)
	at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:453)
	at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:246)
	at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:198)
	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:117)
	at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:123)
	at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:365)
	at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:194)
	at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:460)
	at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:534)
	at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115)
	at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112)
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.buildSqlSessionFactory(MybatisSqlSessionFactoryBean.java:576)
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.afterPropertiesSet(MybatisSqlSessionFactoryBean.java:390)
	at com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean.getObject(MybatisSqlSessionFactoryBean.java:630)
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration.sqlSessionFactory(MybatisPlusAutoConfiguration.java:173)
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$bc127659.CGLIB$sqlSessionFactory$0(<generated>)
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$bc127659$$FastClassBySpringCGLIB$$e90e0229.invoke(<generated>)
	at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228)
	at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361)
	at com.baomidou.mybatisplus.autoconfigure.MybatisPlusAutoConfiguration$$EnhancerBySpringCGLIB$$bc127659.sqlSessionFactory(<generated>)

配置用户名密码了还是报密码错误连不上数据库。

spring:
  profiles: dev

spring:
  profiles: prod

结果发现yml配置文件中配置了两个连接环境，检查以下需要配置的环境，修改数据库密码，解决问题。

这应该是目前最全面的Java面试文档了吧，所有面试题知识点，一个文档解决，需要的可以搜索公众号"源码宇宙"，回复"面试题"获取。