JSON parse error: Cannot construct instance of `common.ServerResponse` (although at least one Creato

[p-nio-80-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is feign.codec.DecodeException: Error while extracting response for type [class common.ServerResponse] and content type [application/json;charset=UTF-8]; nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error: Cannot construct instance of common.ServerResponse (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of common.ServerResponse (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (PushbackInputStream); line: 1, column: 2]] with root cause
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of common.ServerResponse (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)

我看到creator我想是constructor吗？于是发现没有加无参构造器

在整合feign的时候 缺少一个无参构造器

json在转对象反序列化的时候，需要先初始化对象，默认调用无参构造函数，再赋值，所以抛出异常。