Hi all,
I have a very simple database with two tables: Departments [Id, Name] and Employees [Id, DepartmentsId, FirstName, LastName]. I am trying to get a bidirectional relationship working in Hibernate but it keeps generating an infinite loop and then a StackOverFlow exception. Here are my classes:
Departments:
Code:
package com.test.model;
// Generated Apr 7, 2012 7:10:28 PM by Hibernate Tools 3.4.0.CR1
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.JoinTable;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.JoinColumn;
/**
* Departments generated by hbm2java
*/
@Entity
@Table(name="Departments"
,catalog="test"
)
public class Departments implements java.io.Serializable {
private Integer id;
private String name;
private Set<Employees> employeeses = new HashSet(0);
public Departments() {
}
public Departments(String name) {
this.name = name;
}
public Departments(String name, Set employeeses) {
this.name = name;
this.employeeses = employeeses;
}
@Id @GeneratedValue(strategy=IDENTITY)
@Column(name="Id", unique=true, nullable=false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name="Name", nullable=false)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(fetch=FetchType.LAZY, mappedBy="departments")
@Column(name="DepartmentsId")
/*@OneToMany
@JoinColumn(name="DepartmentsId", nullable=false)*/
public Set<Employees> getEmployeeses() {
return this.employeeses;
}
public void setEmployeeses(Set employeeses) {
this.employeeses = employeeses;
}
}
Employees:
Code:
Hi all,
I have a very simple database with two tables: Departments [Id, Name] and Employees [Id, DepartmentsId, FirstName, LastName]. I am trying to get a bidirectional relationship working in Hibernate but it keeps generating an infinite loop and then a StackOverFlow exception. Here are my classes:
Departments:
[code]package com.test.model;
// Generated Apr 7, 2012 7:10:28 PM by Hibernate Tools 3.4.0.CR1
import java.util.HashSet;
import java.util.Set;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.JoinTable;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;
import javax.persistence.JoinColumn;
/**
* Departments generated by hbm2java
*/
@Entity
@Table(name="Departments"
,catalog="test"
)
public class Departments implements java.io.Serializable {
private Integer id;
private String name;
private Set<Employees> employeeses = new HashSet(0);
public Departments() {
}
public Departments(String name) {
this.name = name;
}
public Departments(String name, Set employeeses) {
this.name = name;
this.employeeses = employeeses;
}
@Id @GeneratedValue(strategy=IDENTITY)
@Column(name="Id", unique=true, nullable=false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@Column(name="Name", nullable=false)
public String getName() {
return this.name;
}
public void setName(String name) {
this.name = name;
}
@OneToMany(fetch=FetchType.LAZY, mappedBy="departments")
@Column(name="DepartmentsId")
/*@OneToMany
@JoinColumn(name="DepartmentsId", nullable=false)*/
public Set<Employees> getEmployeeses() {
return this.employeeses;
}
public void setEmployeeses(Set employeeses) {
this.employeeses = employeeses;
}
}[/code]
Employees:
[code]package com.test.model;
// Generated Apr 7, 2012 7:10:28 PM by Hibernate Tools 3.4.0.CR1
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import static javax.persistence.GenerationType.IDENTITY;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
/**
* Employees generated by hbm2java
*/
@Entity
@Table(name="Employees"
,catalog="test"
)
public class Employees implements java.io.Serializable {
private Integer id;
private Departments departments;
private String firstName;
private String lastName;
public Employees() {
}
public Employees(Departments departments, String firstName, String lastName) {
this.departments = departments;
this.firstName = firstName;
this.lastName = lastName;
}
@Id @GeneratedValue(strategy=IDENTITY)
@Column(name="Id", unique=true, nullable=false)
public Integer getId() {
return this.id;
}
public void setId(Integer id) {
this.id = id;
}
@ManyToOne
@JoinColumn(name="DepartmentsId", nullable=false, insertable=false, updatable=false)
public Departments getDepartments() {
return this.departments;
}
public void setDepartments(Departments departments) {
this.departments = departments;
}
@Column(name="FirstName", nullable=false)
public String getFirstName() {
return this.firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
@Column(name="LastName", nullable=false)
public String getLastName() {
return this.lastName;
}
public void setLastName(String lastName) {
this.lastName = lastName;
}
}
My HQL query is simply: "FROM Departments d JOIN FETCH d.employeeses e".
I have tried Departments using both the existing and commented-out sets of annotations on "getEmployeeses". According to everything I have been reading, including the Hibernate documentation on bidirectional collections (
http://docs.jboss.org/hibernate/orm/3.6 ... irectional) these annotations should, in effect, set the "inverse" types for the two tables and thus avoid the problem I am running into, that every time "Departments" grabs an "Employees" set, each new "Employees" object creates another "Departments," which then creates another "Employees" set, so on and so forth, into an infinite loop. However, the issue still occurs unless I remove the "Departments" object from the "Employees" class, thus creating a unidirectional mapping, which I do not want to do. What the heck am I doing wrong here?
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