"Redis" Wrongtype Operation against a key Holding_redis

A problem occurred when inserting data using Jedis:

Redis.clients.jedis.exceptions.JedisDataException:WRONGTYPE Operation against a key holding the wrong kind of value

This is probably how the code is implemented:

hashmap<string,string> map = new hashmap<string,string> ();
Map.put ("Mapkey", "20145");	
Jedis.hmset ("key", map);

It doesn't look like the value type is wrong. It turns out that the same key already exists in the Redis database, and that the value type of the key is not hashmap, and this error is thrown when you call Hmset.

Clean out the original data and run it again.