redis读取缓存数据时出现异常，异常信息如下：Error in execution; nested exception is io.lettuce.core.RedisCommandExecutionException: WRONGTYPE Operation against a key holding the wrong kind of value，翻译出来的意思就是，redis命令执行异常:错误的操作类型对应的key保存了错误的值类型，认真核对后发现是缓存中设置的为 string类型的value值，而在应用中则采用了list的方式进行数据的获取，造成操作类型和value 的类型不匹配的问题，后来就把redis中设置的value类型改成了list，然后再次操作出现新的异常，异常信息如下：

Could not read JSON: Invalid UTF-8 start byte 0x80

at [Source: (byte[])"“11.20.207.21”"; line: 1, column: 3]; nested exception is com.fasterxml.jackson.core.JsonParseException: Invalid UTF-8 start byte 0x80

at [Source: (byte[])"“11.20.207.21”"; line: 1, column: 3]

其初是以为redisTemplate对值进行序列化的时候是按照json格式进行设置的，所以无法正常序列化字符串格式（PS：当时有点犯浑），然后将字符串改成了jsonObject格式"{"ip":"11.20.207.21"}"，再次操作出现了新的异常，异常信息如下：

Could not read JSON: Unexpected token (START_OBJECT), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.lang.Object

at [Source: (byte[])"{"ip":"11.20.207.21"}"; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.lang.Object

at [Source: (byte[])"{"ip":"11.20.207.21"}"; line: 1, column: 1]

然后没认真分析只看到 need JSON Array to contain贸然认为是是需要JSONArray的值类型，然后就把jsonObject类型改成了JSONArray格式{ "data": [ { "ip": "1.202.237.218" } ]}"，再次操作仍出现异常，异常信息如下：

Could not read JSON: Unexpected token (START_OBJECT), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.lang.Object

at [Source: (byte[])"{  "data": [ { "ip": "11.20.207.21"} ]}"; line: 1, column: 1]; nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Unexpected token (START_OBJECT), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class java.lang.Objectat [Source: (byte[])"{    "data": [  {"ip": "11.20.207.21" } ]}"; line: 1, column: 1]

无奈只下只能把配置删除手动重新配置了一次，再次操作一切OK ^_^! 当是有点百撕不得其姐，今日复盘才发现问题根本原因：当时配置value时 值是从微信直接复制进来的，复制的时候可能复制了一个特殊字符进来，所以造成应用解析出现异常，其实异常提示已经很明确喽“[Source: (byte[])"“11.20.207.21”"; line: 1, column: 3]”，标红的地方就是特殊字条，只是肉眼看不到而已，再加上当时犯浑这么明显的提示都没分析出来*_*!，白白浪费大好时光啊。

特记录下来已飨回忆。