java @JsonInclude(Include.NON_NULL) 不工作/jackson 序列化空值
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@JsonInclude(Include.NON_NULL) not working/ Hymanson serializing null values
提问by Pushpendra Jaiswal
I have placed the annotation over the class/pojo and also configured the mapper, but it still serializenullvalues
我已经将注释放在 class/pojo 上并配置了映射器，但它仍然序列化空值
I am using Hibernate 4.3.7Final and Hymanson 2.4.4. The collections are lazy loaded
我正在使用 Hibernate 4.3.7Final 和 Hymanson 2.4.4。集合是延迟加载的
Pojo : Removed getter and setters
Pojo：删除了 getter 和 setter
@JsonInclude(Include.NON_NULL)
@Entity
@Table
public class School {
@Id
@GeneratedValue
private int id;
@OneToMany(cascade=CascadeType.ALL,fetch= FetchType.LAZY)
private List<Student> students;
@OneToMany(cascade=CascadeType.ALL,fetch= FetchType.LAZY)
private List<Employee> staff;
}
JSONMapper:
JSON映射器：
@Component
public class JSONMapper extends ObjectMapper {
/**
*
*/
private static final long serialVersionUID = -3131980955975958812L;
//ref http://blog.pastelstudios.com/2012/03/12/spring-3-1-hibernate-4-Hymanson-module-hibernate/
public JSONMapper() {
Hibernate4Module hm = new Hibernate4Module();
registerModule(hm);
configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
configure(SerializationFeature.INDENT_OUTPUT , false);
configure(MapperFeature.DEFAULT_VIEW_INCLUSION, false);
setSerializationInclusion(Include.NON_NULL);
}
}
Output :
输出 ：
{"id":1,"students":null,"staff":null}
回答by Vlad Mihalcea
Try using JsonInclude.NON_EMPTYinstead.
回答by StaxMan
You may want to file a bug against project; it could be that handling for lazy-loaded collections (which do require special handling and overrides to default one) is not doing proper inclusion checks.
您可能想针对项目提交错误；可能是处理延迟加载的集合（确实需要特殊处理并覆盖默认集合）没有进行适当的包含检查。
