Use DataSourc to get database connection report java.sql.SQLException: Access denied for user''@'localhost' (using password: NO)

Error message

java.sql.SQLException: Access denied for user ''@'localhost' (using password: NO)

the reason

The reason is that we did not pass in or did not configure the username and password of the database . When I started to write springboot using JDBC to obtain the connection object, the reason for this error is that

I actually use data-username and data-password to connect to the database. I blame myself for not being good at learning. Don't laugh, yes, just say you. Be serious. Just change it to the following picture later.

My test code:

@SpringBootTest
class SpringBootDataJdbcApplicationTests {
    
    

    @Autowired
    DataSource dataSource;

    @Test
    void contextLoads() throws SQLException {
    
    
    	// com.zaxxer.hikari.HikariDataSource
        System.out.println(dataSource.getClass());
        Connection connection = dataSource.getConnection();
        System.out.println(connection);
        // 关闭连接
        connection.close();
    }

}