所以我正在使用Java,Hibernate,JPA注释,JAX-RS注释,JAXB注释,Jersey和Jackson JSON解析器开发RESTful数据API.

在尝试了Jersey提供的MAPPING和NATURAL JSON符号的各种配置后,我最终决定使用Jackson JSON解析器.除了这一个问题,杰克逊将是完美的……

我遇到的问题是Jackson没有使用JAXB注释“@XmlID”和“@XmlIDREF”,我用它来表示我的实体关系,虽然“@JsonBackReference”和“@JsonManagedReference”帮助这个.在处理直接自引用属性时,这种组合似乎会崩溃.

这似乎是一个相当普遍的问题.你怎么能和杰克逊一起绕过这个限制？

以我的POJO为……

@XmlRootElement
public class Employee implements Serializable {
    private Date lastUpdatedOn;
    private Employee lastUpdatedBy;
    private Integer empId;

    @JoinColumn(nullable=false)
    @OneToOne
    @XmlIDREF
    public Employee getLastUpdatedBy() {
        return createdBy;
    }
    public void setLastUpdatedBy(Employee lastUpdatedBy) {
        this.lastUpdatedBy = lastUpdatedBy;
    }

    @Temporal(TemporalType.TIMESTAMP)
    public Date getLastUpdatedOn() {
        return createdOn;
    }
    public void setLastUpdatedOn(Date lastUpdatedOn) {
        this.lastUpdatedOn = lastUpdatedOn;
    }
    @XmlID
    @XmlJavaTypeAdapter(IntegerAdapter.class)
    public Integer getEmpId() {
        return empId;
    }
    public void setEmpId(Integer empId) {
        this.empId = empId;
    }
}

……以及以下EmployeeResource ……

@Path("/Employees")
public class EmployeeResource {
  private List

org.codehaus.jackson.map.JsonMappingException: Direct self-reference leading to cycle (through reference chain: resources.EmployeeResource["employees"]->java.util.ArrayList[0]->entities.Employee["lastUpdatedBy"])

{
  "employees" : [ {
    "lastUpdatedOn" : 1331149770737,"lastUpdatedBy" : 10150,"empId" : 10150,} ],}