Exception in thread “main“ com.fasterxml.jackson.databind.JsonMappingException:

问题：jaskson反序列化超出最大长度

Caused by: com.fasterxml.jackson.core.exc.StreamConstraintsException: String length (5043456) exceeds the maximum length (5000000)

场景：前端传递过大base64

原因：

jaskon默认已经限制了最大长度

解决方案

修改spring配置jackson配置bean:

	@BeanJackson2ObjectMapperBuilderCustomizer customStreamReadConstraints() {return (builder) -> builder.postConfigurer((objectMapper) -> objectMapper.getFactory().setStreamReadConstraints(StreamReadConstraints.builder().maxNestingDepth(2000).maxStringLength(Integer.MAX_VALUE).build()));}