报错：
Caused by: : Unable to open a test connection to the given database. JDBC url = jdbc:mysql://VM1:3306/hive?characterEncoding=UTF-8, username = root. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------
: Access denied for user ‘root’@‘VM1’ (using password: YES)
解决方案：
1、授权
设置用户root可以在任意IP下被访问：
grant all privileges on . to root@"%" identified by “新密码”；
设置用户root可以在本地被访问：
grant all privileges on . to root@“localhost” identified by “新密码”
刷新权限使之生效
flush privileges;
2、删除对应主机用户
use mysql;
select host,user from user;
drop user ‘username’@‘host’;