jackson - JsonIgnoreProperties 不起作用

Question

我有以下简单的类:

import org.codehaus.jackson.annotate.JsonIgnoreProperties;
@JsonIgnoreProperties({ "thirdField" })
public class Message {

    private TypeA type;
    private String producer;

//Getters and Setters

}

在我的测试课

import com.fasterxml.jackson.databind.MapperFeature;
import com.fasterxml.jackson.databind.ObjectMapper;

public class Test {
   public void testMethd() {
   ObjectMapper objectMapper = new ObjectMapper();
   objectMapper.configure(MapperFeature.USE_ANNOTATIONS, true);
   Class<T> instanceType = Message.class;

   String msgBody = "{\"producer\": \"clientApp\", \"type\": \"aType\", \"thirdField\": []}";
   objectMapper.readValue(msgBody, instanceType);
   }
}

我想做的就是将上面的 json 字符串转换为 Message 类并忽略“thirdField”。但我不断得到

com.fasterxml.jackson.databind.exc.UnrecognizedPropertyException: Unrecognized field "thirdField" (class Message), not marked as ignorable (2 known properties: , "type", "producer"])

Answer 1

您混合了 jackson 的不同版本。请注意，您从 org.codehaus.jackson.annotate(版本 1.x)导入 JsonIgnoreProperties当您使用 com.fasterxml.jackson.databind(版本 2.x)中的 ObjectMapper 时。