import java.util.List;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GenerationType;
import javax.persistence.OneToMany;
import javax.persistence.GeneratedValue;
import javax.persistence.Column;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name="units")
public class Unit{
   private Integer id;
   private List<UnitAuthority> unitAuthorities;
   
   @Id @GeneratedValue(strategy = GenerationType.IDENTITY) @Column(name="id")
   public Integer getId(){
      return id;
   }
   public void setId(Integer id) {
      this.id = id;
   }
   
   @OneToMany(mappedBy="unit" fetch=FetchType.EAGER)
   public List<UnitAuthority> getUnitAuthorities() {
      return unitAuthorities;
   }
   
   public void setUnitAuthorities(List<UnitAuthority> unitAuthorities) {
      this.unitAuthorities = unitAuthorities;
   }
}

import java.io.Serializable;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.OneToOne;
import javax.persistence.Table;

@Entity @Table(name="units_authorities")
public class UnitAuthority implements Serializable{
   private static final long serialVersionUID = 1L;
   private Unit unit;
   private String authority;
   private Integer usersNumber;
   
   @Id
   @OneToOne
   @JoinColumn(name="fk_units_id")
   public Unit getUnit() {
      return unit;
   }
   
   public void setUnit(Unit unit) {
      this.unit = unit;
   }
   
   @Id
   @Column(name="fk_dic_authorities_id")
   public String getAuthority() {
      return authority;
   }
   
   public void setAuthority(String authority) {
      this.authority = authority;
   }
   
   @Column(name="users_number")
   public Integer getUsersNumber() {
      return usersNumber;
   }
   
   public void setUsersNumber(Integer usersNumber) {
      this.usersNumber = usersNumber;
   }
}