我正在使用帮助内部类反序列化一些输入。当我使用静态类时,反序列化工作。
public class Test {
public static void main(String[] args) throws IOException {
String message = "{\"location\":\"https://some.com\"}";
URL url = new ObjectMapper()
.readValue(message,Loc.class).getLocation();
System.out.println(url.toString());
}
@Getter
@Setter
private class Loc {
URL location;
}
}
在上面运行主类时出现错误:
Exception in thread "main" com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `Test$H$Loc` (although at least one Creator exists): can only instantiate non-static inner class by using default,no-argument constructor
at [Source: (String)"{"location":"https://some.com"}"; line: 1,column: 2]
at com.fasterxml.jackson.databind.exc.MismatchedInputException.from(MismatchedInputException.java:63)
at com.fasterxml.jackson.databind.DeserializationContext.reportInputMismatch(DeserializationContext.java:1343)
at com.fasterxml.jackson.databind.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1032)
at com.fasterxml.jackson.databind.deser.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1294)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326)
at com.fasterxml.jackson.databind.deser.BeanDeserializer.deserialize(BeanDeserializer.java:159)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:3004)
当我将类设为静态时,一切正常。但是我需要非静态类。怎么了?
UPD:我可以通过使Loc类成为外部类而不是内部类来解决此问题。我的问题是,当我想将Loc作为内部类使用时,为什么要将其静态化以进行序列化? UPD:删除了无关紧要的内部类H