JSON：JsonMappingException，同时尝试使用空值反序列化对象

Question

我尝试反序列化包含null属性并具有的对象JsonMappingException。

我做的事：

String actual = "{\"@class\" : \"PersonResponse\"," +
                "  \"id\" : \"PersonResponse\"," +
                "  \"result\" : \"Ok\"," +
                "  \"message\" : \"Send new person object to the client\"," +
                "  \"person\" : {" +
                "    \"id\" : 51," +
                "    \"firstName\" : null}}";
ObjectMapper mapper = new ObjectMapper();
mapper.readValue(new StringReader(json), PersonResponse.class); //EXCEPTION!

但是 ：如果扔掉"firstName = null"财产-一切正常！我的意思是传递下一个字符串：

String test = "{\"@class\" : \"PersonResponse\"," +
                "  \"id\" : \"PersonResponse\"," +
                "  \"result\" : \"Ok\"," +
                "  \"message\" : \"Send new person object to the client\"," +
                "  \"person\" : {" +
                "    \"id\" : 51}}";
ObjectMapper mapper = new ObjectMapper();
mapper.readValue(new StringReader(json), PersonResponse.class); //ALL WORKS FINE!

问题 ：如何避免此异常或保证杰克逊在序列化期间忽略空值？

抛出：

信息：

com.fasterxml.jackson.databind.MessageJsonException:
 com.fasterxml.jackson.databind.JsonMappingException:
  N/A (through reference chain: person.Create["person"]->Person["firstName"])

原因：

com.fasterxml.jackson.databind.MessageJsonException:
 com.fasterxml.jackson.databind.JsonMappingException:
  N/A (through reference chain: prson.Create["person"]->Person["firstName"])

原因： java.lang.NullPointerException

Answer 1

如果您不想序列化null值，则可以使用以下设置（序列化期间）：

objectMapper.setSerializationInclusion(Include.NON_NULL);

希望这能解决您的问题。

但是NullPointerException反序列化过程中获得的结果对我来说似乎很可疑（理想情况下，杰克逊应该能够处理null序列化输出中的值）。您可以张贴与PersonResponse课程相对应的代码吗？