我已将注释放在类/ pojo上并配置了映射器,但仍然序列化 null 值
我使用的是Hibernate 4.3.7Final和Jackson 2.4.4。这些集合延迟加载
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:
@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-jackson-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);
}
}
输出:
{"id":1,"students":null,"staff":null}
答案 0 :(得分:8)
请尝试使用JsonInclude.NON_EMPTY。
答案 1 :(得分:3)
您可能想要针对项目提交错误;可能是对延迟加载的集合(需要特殊处理和覆盖默认处理)的处理没有进行适当的包含检查。