如何修复弹簧靴一对多双向无限循环? [英] how to Fix spring boot one to many bidirectional infinity loop?

问题描述

我尝试使用spring boot和spring data jpa创建一对多的双向映射，请查看以下实体

i am try to create a one to many bidirectional mapping using spring boot and spring data jpa please look the below entity

雇主实体

@Entity  
public class Employer  
{  
private Long id;  
private String employerName;  
private List<Employee> employees;  

@Id  
@GeneratedValue(strategy=GenerationType.AUTO)  
public Long getId()  
{  
    return id;  
}  
public void setId(Long id)  
{  
    this.id = id;  
}  
public String getEmployerName()  
{  
    return employerName;  
}  
public void setEmployerName(String employerName)  
{  
    this.employerName = employerName;  
}  

@OneToMany(cascade=CascadeType.ALL, mappedBy="employer")  
public List<Employee> getEmployees()  
{  
    return employees;  
}  
public void setEmployees(List<Employee> employees)  
{  
    this.employees = employees;  
}  
} 

员工实体

@Entity  
public class Employee  
{  
private Long id;  
private String employeeName;  
private Employer employer;  

@Id  
@GeneratedValue(strategy=GenerationType.AUTO)  
public Long getId()  
{  
    return id;  
}  
public void setId(Long id)  
{  
    this.id = id;  
}  
public String getEmployeeName()  
{  
    return employeeName;  
}  
public void setEmployeeName(String employeeName)  
{  
    this.employeeName = employeeName;  
}  
@ManyToOne(cascade=CascadeType.ALL, fetch = FetchType.LAZY)  
public Employer getEmployer()  
{  
    return employer;  
}  
public void setEmployer(Employer employer)  
{  
    this.employer = employer;  
}  
}  

雇主回购

public interface EmployerServices extends JpaRepository<Employer, Long> {
}

员工回购

public interface EmployeeServices extends JpaRepository<Employee, Long> {
}

REST控制器是

REST Controller is

 @RestController
 public class Controller {
 @Autowired EmployeeServices employeeServices;
 @Autowired EmployerServices employerServices;
 @GetMapping("/getempr")
 public Object getempr(){
    return employerServices.findOne(1L);
 }
}

现在问题开始开始，请看我的输出

now the problem begin start see my out put

它看起来像是内斗循环，我的服务器抛出错误getOutputStream()已为此响应调用.

its look like a infighting loop and my server throwing error getOutputStream() has already been called for this response.

 I used @JsonBackReference & @JsonManagedReference 

注释，但问题在于它的作用就像一对多

annotation but the problem is its working like one to many

 {
   "id":1,
   "employerName":"employer",
   "employees":[
     {"id":1,"employeeName":"emp1"},
     {"id":2,"employeeName":"emp2"}
   ]
}  

如果我想引起所有人之间的关注，就像所有有雇主的雇员一样.输出是

if I am trying to get in the concern of many to one like all employee with employer. the output is

 [
  {
   "id":1,
   "employeeName":"emp1"
  },
  {
    "id":2,
    "employeeName":"emp2"}
 ]

它没有向我显示雇主详细信息.

its not showing me the employer details.

请向我建议我在做什么错.预先感谢！

please suggets me guys what i am doing wrong. thanks in advance!!

推荐答案

使用JSON是双向映射的问题.使用以下属性.

with the JSON its a problem with bi-directional mapping. Use the below properties.

@JsonIgnoreProperties("employer")
@JsonIgnoreProperties("employees")

请始终保持获取类型.

希望这会起作用.

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