org.springframework.data.redis.serializer.SerializationException: Cannot serialize; nested exception is org.springframework.core.serializer.support.SerializationFailedException: 
Failed to serialize object using DefaultSerializer; nested exception is java.lang.IllegalArgumentException: DefaultSerializer requires a Serializable 
payload but received an object of type [cn.bloghut.pojo.User]

错误原因

pojo 类没有序列化导致的

解决办法

实现 Serializable接口