使用Java連線Redis伺服器的時候發生該錯誤，提示ERR Client sent AUTH, but no password is set

Caused by: redis.clients.jedis.exceptions.JedisDataException: ERR Client sent AUTH, but no password is set
    at redis.clients.jedis.Protocol.processError(Protocol.java:127) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.Protocol
 
.process(Protocol.java:161) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.Protocol.read(Protocol.java:215) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.Connection.readProtocolWithCheckingBroken(Connection.java:340) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.Connection.getStatusCodeReply(Connection.java
 
:239) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.BinaryJedis.auth(BinaryJedis.java:2139) ~[jedis-2.9.0.jar:na]
    at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:108) ~[jedis-2.9.0.jar:na]
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868) ~[commons-pool2-2.4
 
.2.jar:2.4.2]
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:435) ~[commons-pool2-2.4.2.jar:2.4.2]
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363) ~[commons-pool2-2.4.2.jar:2.4.2]
    at redis.clients.util.Pool.getResource(Pool.java:49) ~[jedis-2.9.0.jar:na]
    ... 128 common frames omitted

解決

是因為 Redis 伺服器沒有設定密碼，但是客戶端傳送了AUTH請求，所以發生了該異常；

可以使用如下方式啟動

1 指定配置檔案

redis-server /etc/redis/redis.conf

2 不指定配置檔案(無密碼)

redis-server