Cannot construct instance of `com.*` (although at least one Creator exists): cannot deserialize
今天在写springboot单元测试的时候,序列化对象时出现一个错误:Cannot construct instance of `com.*.GeneralResponse` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Cre
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今天在写springboot单元测试的时候,序列化对象时出现一个错误:
Cannot construct instance of `com.*.GeneralResponse` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (String)"{"transaction_id":"123"}"; line: 1, column: 2]
com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.*.GeneralResponse` (although at least one Creator exists): cannot deserialize from Object value (no delegate- or property-based Creator)
at [Source: (String)"{"transaction_id":"123"}"; line: 1, column: 2]
需要序列化的json串为:
{"transaction_id":"123"}
对象为:
@Getter
@Setter
@AllArgsConstructor
public class GeneralResponse {
private String transactionId;
}
错误的原因是没有无参构造函数,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,在使用@Builder注解时必须搭配@AllArgsConstructor 和@NoArgsConstructor同时使用。
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