我得到了一个代表团的课程设置
public class MyClass implements List {
public String name;
public List target; // this is the delegation target
// more fields
@Override
public Integer get(int index) {
return target.get(index);
}
// all other method in target interface is delegated
}
我得到了一个看起来像这样的JSON：
{"target": [1, 2, 3] , "name":"foo"}
杰克逊抛出这个：
Exception in thread "main" com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of com.foo.MyClass out of START_OBJECT token
at [Source: java.io.StringReader@156e5f3e; line: 1, column: 1]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:164)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:691)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:685)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:256)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:214)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:204)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2986)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2091)
我猜测杰克逊认为MyClass是一个列表所以不知道如何处理{}因为[]是预期的
我通过让MyClass没有实现List< Integer>来证实了我的推测. ：
public class MyClass { /*same stuff*/}
一切顺利.但我需要MyClass来实现List< Integer> ….
我可以使用模块中的注释或配置来解决这个问题吗？
