@Entity
@Table(name = "person")
public class Person {
   
   //Fields
   private Long id;
   private String name;
   private Date birthDate;
   private Set<Vehicle> vehicles = new HashSet<Vehicle>();
   

   //Property accessors
   @Id
   @GeneratedValue(strategy = IDENTITY)
   @Column(name = "id", unique = true, nullable = false)
   public Long getId() {
      return this.id;
   }

   public void setId(Long id) {
System.out.println("in java Person-> setId = "+id);
      this.id = id;
   }

   @Column(name = "Name", nullable = false, length = 35)
   public String getName() {
      return this.name;
   }

   public void setName(String name) {
System.out.println("in java Person-> setName = "+name);   
      this.name = name;
   }   
   
   @Temporal(TemporalType.DATE)
   @Column(name = "BirthDate", nullable = true, length = 10)
   public Date getBirthDate() {
      return this.birthDate;
   }

   public void setBirthDate(Date birthDate) {
      this.birthDate = birthDate;
   }   
         
   @CollectionOfElements(targetElement = be.tradelec.model.Vehicle.class)
   @OneToMany(mappedBy = "person_id", cascade=CascadeType.ALL, fetch=FetchType.EAGER)
   public Set<Vehicle> getVehicles() {
      return vehicles;
   }      
   
   public void setVehicles(Set<Vehicle> vehicles) {
System.out.println("in java Person-> setVehicles = "+vehicles);
      this.vehicles = vehicles;
   }
   
   public void addVehicle(Vehicle vehicle) {
      vehicles.add(vehicle);
      vehicle.setPerson(this);
   }
   
}

@Entity
@Table(name = "vehicle")
public class Vehicle {

   // Fields
   private Long id;   
   private Long person_id;   
   private Person person;   
   private String licensePlate;
   private String brand;
   private String type;
   
   // Constructors
   /** default constructor */
   public Vehicle() {
   }

   /** full constructor */
   public Vehicle(Long id, Person person,
         String licensePlate, String brand, String type) {
      this.id = id;
      //this.person = person;
      this.licensePlate = licensePlate;
      this.brand = brand;
      this.type = type;
   }
   
   // Property accessors
   @Id
   @GeneratedValue(strategy = GenerationType.AUTO)
   @Column(name = "id", unique = true, nullable = false)
   public Long getId() {
      return this.id;
   }

   public void setId(Long id) {
      System.out.println("in java Vehicle-> setIdVehicle = "+id);
      this.id = id;
   }
      
   @CollectionOfElements(targetElement = be.tradelec.model.Person.class)
   @ManyToOne(fetch=FetchType.EAGER)
   @JoinColumn(name = "person_id")
   public Person getPerson() {
      return this.person;
   }

   public void setPerson(Person person) {
      this.person = person;
   }

   @Column(name = "LicensePlate", nullable = true, length = 10)
   public String getLicensePlate() {
      return this.licensePlate;
   }

   public void setLicensePlate(String licensePlate) {
      this.licensePlate = licensePlate;
   }

   @Column(updatable=false, insertable=false)
   public Long getPerson_id() {
      return person_id;
   }

   public void setPerson_id(Long person_id) {
      this.person_id = person_id;
   }

   @Column(name = "Brand", nullable = false, length = 45)
   public String getBrand() {
      return this.brand;
   }

   public void setBrand(String brand) {
      this.brand = brand;
   }

   @Column(name = "Type", nullable = false, length = 45)
   public String getType() {
      return this.type;
   }

   public void setType(String type) {
      this.type = type;
   }

}

Hibernate: select person0_.id as id4_1_, person0_.BirthDate as BirthDate4_1_, person0_.Name as Name4_1_, vehicles1_.person_id as person4_3_, vehicles1_.id as id3_, vehicles1_.id as id5_0_, vehicles1_.Brand as Brand5_0_, vehicles1_.LicensePlate as LicenseP3_5_0_, vehicles1_.person_id as person4_5_0_, vehicles1_.Type as Type5_0_ from person person0_ left outer join vehicle vehicles1_ on person0_.id=vehicles1_.person_id where person0_.id=?
in java Vehicle-> setIdVehicle = 1
in java Person-> setId = 1
in java Vehicle-> setIdVehicle = 2
in java Person-> setName = Jochen
17-jun-2009 10:30:06 org.hibernate.LazyInitializationException <init>
SEVERE: illegal access to loading collection
org.hibernate.LazyInitializationException: illegal access to loading collection
   at org.hibernate.collection.AbstractPersistentCollection.initialize(AbstractPersistentCollection.java:363)
...