Hi,

I am newbie to Hibernate. During my first development with hibernate I just stuck with the mapping issue. I am just trying to create a mapping b/w two very basic objects City and Area.

Following is my code:


---- Area.java ---

import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;

@Entity
@Table(name="area")
public class Area implements Serializable{

private static final long serialVersionUID = 788844354020585864L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String name;
@ManyToOne
@JoinColumn(name="id",nullable=false,insertable=false, updatable=false)
private City city;
private String description;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}

public City getCity() {
return city;
}
public void setCity(City city) {
this.city = city;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
}

--- City.java ----
import java.io.Serializable;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="city")
public class City implements Serializable{

private static final long serialVersionUID = 7169196135557433984L;

@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String name;

public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

There is no relation created in the generated tables; Furthermore if I am adding a collection of Area in the city with OneToMany annotation i got the following exception.

Initial SessionFactory creation failed.org.hibernate.MappingException: Could not determine type for: java.util.Set, for columns: [org.hibernate.mapping.Column(areas)]

Please guide me in this regard.

Thanks.