com.fasterxml.jackson.databind.exc.InvalidDefinitionException


org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class .utils.push.jEntity.JCircleEntity]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of .utils.push.jEntity.JCircleEntity` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 1, column: 2]
 

解决方案:

增加无参数的构造方法

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