在我的架构中,我有一个这样的抽象类:
@JsonAutoDetect(JsonMethod.NONE)
public abstract class AbstractEntity {
@Id private Object id;
@Version private Integer version;
public AbstractEntity() {}
@JsonProperty // this annotation causes infinite recursion
public Object getId() { return id; }
}
此类用作每个实体的超类,例如:
@JsonAutoDetect(JsonMethod.NONE)
public class Usuario extends AbstractEntity {
private Cadastro cadastro;
protected Usuario() {}
public Usuario(Cadastro cadastro) {
setCadastro(cadastro);
}
@JsonProperty
public Cadastro getCadastro() { return cadastro; }
@JsonProperty
public void setCadastro(Cadastro cadastro) { this.cadastro = cadastro; }
}
我正在设计一个REST层,让用户通过JSON请求/响应在db中创建记录:
@POST
@Path("cadastrar")
@Consumes(MediaType.APPLICATION_JSON)
@Produces(MediaType.APPLICATION_JSON)
public Response cadastrar(@Context HttpServletRequest request, Cadastro cadastro) {
OObjectDatabaseTx bd = (OObjectDatabaseTx) request.getAttribute("object.database.tx");
try {
bd.begin();
Usuario usuario = new Usuario(cadastro);
usuario = bd.save(usuario);
bd.commit();
String json = new ObjectMapper().writeValueAsString(usuario);
Response response = Response.status(HttpURLConnection.HTTP_CREATED).entity(json).build();
return response;
(...)
然而,在最后一种方法中,当我调用Jackson来序列化我新创建的实体时(在writeValueAsString
方法中),我得到一个无限递归:
org.codehaus.jackson.map.JsonMappingException: Infinite recursion (StackOverflowError) (through reference chain:
com.orientechnologies.orient.core.id.ORecordId["record"]->com.orientechnologies.orient.core.record.impl.ODocument["identity"]
->com.orientechnologies.orient.core.id.ORecordId["record"]->com.orientechnologies.orient.core.record.impl.ODocument["identity"]
->com.orientechnologies.orient.core.id.ORecordId["record"]->com.orientechnologies.orient.core.record.impl.ODoc...
我可以通过从@JsonProperty
类中的getId
方法中删除AbstractEntity
来避免无限递归。但是,这样JSON响应中不会出现id
属性。
那么,如何序列化id
属性?
谢谢!
答案 0 :(得分:2)
杰克逊是否支持循环引用?是这样的吗?