Problem at insert with relationship JPA 2.0

[Miltos Tereres]

Here is my Employee entity

  public class Employee implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    
    @Lob
    private ArrayList<String> rights;

    @ManyToOne
    private EmployeeGroups group;
    
    @OneToOne(mappedBy="employee",cascade=CascadeType.PERSIST)
    private Account account;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Employee)) {
            return false;
        }
        Employee other = (Employee) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "gr.medilab.personnel.data.Employee[id=" + id + "]";
    }

    /**
     * @return the rights
     */
    public ArrayList<String> getRights() {
        return rights;
    }

    /**
     * @param rights the rights to set
     */
    public void setRights(ArrayList<String> rights) {
        this.rights = rights;
    }

    /**
     * @return the name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name the name to set
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return the group
     */
    public EmployeeGroups getGroup() {
        return group;
    }

    /**
     * @param group the group to set
     */
    public void setGroup(EmployeeGroups group) {
        this.group = group;
    }

    /**
     * @return the account
     */
    public Account getAccount() {
        return account;
    }

    /**
     * @param account the account to set
     */
    public void setAccount(Account account) {
        this.account = account;
    }
    public boolean hasAccount()
    {
        return getAccount()!=null;
    }
}  

Here is my Account Entity

   /*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

package gr.medilab.model.personnel.data;

import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToOne;
import javax.persistence.Table;


@Entity
@Table(name="Accounts")
public class Account implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    @OneToOne
    private Employee employee;
    private String username;
    private String password;

    public boolean passwordMatch(String password)
    {
        return true;
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }

    @Override
    public int hashCode() {
        int hash = 0;
        hash += (id != null ? id.hashCode() : 0);
        return hash;
    }

    @Override
    public boolean equals(Object object) {
        // TODO: Warning - this method won't work in the case the id fields are not set
        if (!(object instanceof Account)) {
            return false;
        }
        Account other = (Account) object;
        if ((this.id == null && other.id != null) || (this.id != null && !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public String toString() {
        return "gr.medilab.model.personnel.data.Account[id=" + id + "]";
    }

    /**
     * @return the username
     */
    public String getUsername() {
        return username;
    }

    /**
     * @param username the username to set
     */
    public void setUsername(String username) {
        this.username = username;
    }

    /**
     * @return the employee
     */
    public Employee getEmployee() {
        return employee;
   }

    /**
     * @param password the password to set
     */
    public void setPassword(String password) {
        this.password = password;
    }

}
 

When i try to add a new employee

  Employee e=new Employee();
e.setGroup(pousts);
e.setName("Pisoglentis");
ArrayList<String> piso=new ArrayList<String>();
piso.add("malakas");
piso.add("pousti");

Account ac=new Account();

ac.setUsername("Doroula");
e.setAccount(ac);
e.setRights(piso);

em.persist(e);
tx.commit();
em.close();
emf.close();  

in the database at the ACCOUNT table i get EMPLOY_ID NULL
why does this happen? what can i do ?
Thank you for your time...

[James Sutherland]

You need to set the employee in the Account (you need a setEmployee() method in Account).

See,
http://en.wikibooks.org/wiki/Java_Persistence/Relationships#Object_corruption.2C_one_side_of_the_relationship_is_not_updated_after_updating_the_other_side

[Miltos Tereres]

Thank you for the reply...
I am trying to understand why it works only from the owner side in one to one relationships...
I will read again your link...

so doing ac.setemploye() only instead of e.setaccount it would work?
i ll try...thanks...