Transaction tx = s.beginTransaction();
    Address address = new Address();
    address.setStreetName("Privet Drive");
    address.setStreetNumber("4");
    Person person = new Person();
    person.setName("Harry Potter");
    person.setAddress(address);
    s.save(person); // should also save address
    s.flush();
    tx.commit();
    s.close();
   
    s = openSession();
    tx = s.beginTransaction();
    int retval = s.createQuery(
      "delete from " + Person.class.getName() + " where id=?"
    ).setParameters(
      new Object[] {person.getId()}, new Type[] { Hibernate.LONG }
    ).executeUpdate();
    tx.commit();

  public void testCascadeRemoveViaQuery() {
    Session s = openSession();
    Transaction tx = s.beginTransaction();
    Address address = new Address();
    address.setStreetName("Privet Drive");
    address.setStreetNumber("4");
    Person person = new Person();
    person.setName("Harry Potter");
    person.setAddress(address);
    s.save(person); // should also save address
    s.flush();
    tx.commit();
    s.close();
   
    s = openSession();
    tx = s.beginTransaction();
    int retval = s.createQuery(
      "delete from " + Person.class.getName() + " where id=?"
    ).setParameters(
      new Object[] {person.getId()}, new Type[] { Hibernate.LONG }
    ).executeUpdate();
    tx.commit();
    s.close();
   
    s = openSession();
    tx = s.beginTransaction();
    person = (Person )s.get(Person.class, person.getId());
    assertNull("person should have been deleted", person);
    address = (Address )s.get(Address.class, address.getId());
    assertNull("address should have been deleted", address);
    tx.commit();
    s.close();
  }
 
  public Class[] getMappings() {
    return new Class[]{
      Person.class,
      Address.class
    };
  }

@Entity
public class Person extends Object implements Serializable {
  /**
   * Holds value of property name.
   */
  private String name;

  /**
   * Getter for property name.
   * @return Value of property name.
   */
  public String getName() {
    return this.name;
  }

  /**
   * Setter for property name.
   * @param name New value of property name.
   */
  public void setName(String name) {
    this.name = name;
  }

  /**
   * Holds value of property address.
   */
  private Address address;

  /**
   * Getter for property address.
   * @return Value of property address.
   */
  @OneToOne(cascade=CascadeType.ALL) @JoinColumn(name="address_id_fk")
  public Address getAddress() {
    return this.address;
  }

  /**
   * Setter for property address.
   * @param address New value of property address.
   */
  public void setAddress(Address address) {
    this.address = address;
  }

  /**
   * Holds value of property id.
   */
  private Long id;

  /**
   * Getter for property id.
   * @return Value of property id.
   */
  @Id
  @GeneratedValue
  public Long getId() {
    return this.id;
  }

  /**
   * Setter for property id.
   * @param id New value of property id.
   */
  public void setId(Long id) {
    this.id = id;
  }
}


@Entity
public class Address extends Object implements Serializable {
  /**
   * Holds value of property streetNumber.
   */
  private String streetNumber;

  /**
   * Getter for property streetNumber.
   * @return Value of property streetNumber.
   */
  public String getStreetNumber() {
    return this.streetNumber;
  }

  /**
   * Setter for property streetNumber.
   * @param streetNumber New value of property streetNumber.
   */
  public void setStreetNumber(String streetNumber) {
    this.streetNumber = streetNumber;
  }

  /**
   * Holds value of property streetName.
   */
  private String streetName;

  /**
   * Getter for property streetName.
   * @return Value of property streetName.
   */
  public String getStreetName() {
    return this.streetName;
  }

  /**
   * Setter for property streetName.
   * @param streetName New value of property streetName.
   */
  public void setStreetName(String streetName) {
    this.streetName = streetName;
  }

  /**
   * Holds value of property city.
   */
  private String city;

  /**
   * Getter for property city.
   * @return Value of property city.
   */
  public String getCity() {
    return this.city;
  }

  /**
   * Setter for property city.
   * @param city New value of property city.
   */
  public void setCity(String city) {
    this.city = city;
  }

  /**
   * Holds value of property state.
   */
  private String state;

  /**
   * Getter for property state.
   * @return Value of property state.
   */
  public String getState() {
    return this.state;
  }

  /**
   * Setter for property state.
   * @param state New value of property state.
   */
  public void setState(String state) {
    this.state = state;
  }

  /**
   * Holds value of property zip.
   */
  private int zip;

  /**
   * Getter for property zip.
   * @return Value of property zip.
   */
  public int getZip() {
    return this.zip;
  }

  /**
   * Setter for property zip.
   * @param zip New value of property zip.
   */
  public void setZip(int zip) {
    this.zip = zip;
  }

  /**
   * Holds value of property id.
   */
  private Long id;

  /**
   * Getter for property id.
   * @return Value of property id.
   */
  @Id
  @GeneratedValue
  public Long getId() {
    return this.id;
  }

  /**
   * Setter for property id.
   * @param id New value of property id.
   */
  public void setId(Long id) {
    this.id = id;
  }
}

em.createQuery("delete from Group").executeUpdate();