今天在用fastjosn jar包中的JsonMapper转对象时报错，对象中有一个集合属性List。网上多种解决方案，只有在类上加上@JsonIgnoreProperties({"handler","kkkkk"})
属性有用，@JsonIgnoreProperties(ignoreUnknown = true)属性也不行。而且神奇的是{}里面的第二个值可以随便写，第一个参数不能动。这个注解是什么意思呢，好奇怪
com.fasterxml.jackson.databind.JsonMappingException: No serializer found for class
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