Do you have a common base class for Hibernate entities?

@MappedSuperclass()
public class BaseEntity {

    private Long id;
    private Long version;
    ...

    @Id @GeneratedValue(strategy = GenerationType.AUTO)
    public Long getId() {return id;}

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

    @Version
    public Long getVersion() {return version;}
    ...

    // Common properties
    @Temporal(TemporalType.TIMESTAMP)
    public Date creationDate() {return creationDate;}
    ...
}

@Entity
public class Customer extends BaseEntity {
    private String customerName;
    ...
}

public abstract class BaseEntity implements Serializable {

    public abstract Long getId();
    public abstract void setId(Long id);

    /**
     * @see java.lang.Object#hashCode()
     */
    @Override
    public int hashCode() {
    	final int prime = 31;
    	int result = 1;
    	result = prime * result + ((getId() == null) ? 0 : getId().hashCode());
    	return result;
    }

    /**
     * @see java.lang.Object#equals(Object)
     */
    @Override
    public boolean equals(Object obj) {
    	if (this == obj)
    		return true;
    	if (obj == null)
    		return false;
    	if (getClass() != obj.getClass())
    		return false;
    	BaseEntity other = (BaseEntity) obj;
    	if (getId() == null) {
    		if (other.getId() != null)
    			return false;
    	} else if (!getId().equals(other.getId()))
    		return false;
    	return true;
    }

    /**
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
    	return new StringBuilder(getClass().getSimpleName()).append(":").append(getId()).toString();
    }

    /**
     * Prints complete information by calling all public getters on the entity.
     */
    public String print() {

    	final String EQUALS = "=";
    	final String DELIMITER = ", ";
    	final String ENTITY_FORMAT = "(id={0})";

    	StringBuffer sb = new StringBuffer("{");

    	PropertyDescriptor[] properties = PropertyUtils.getPropertyDescriptors(this);
    	PropertyDescriptor property = null;
    	int i = 0;
    	while ( i < properties.length) {

    		property = properties[i];
    		sb.append(property.getName());
    		sb.append(EQUALS);

    		try {
    			Object value = PropertyUtils.getProperty(this, property.getName());
    			if (value instanceof BaseEntity) {
    				BaseEntity entityValue = (BaseEntity) value;
    				String objectValueString = MessageFormat.format(ENTITY_FORMAT, entityValue.getId());
    				sb.append(objectValueString);
    			} else {
    				sb.append(value);
    			}
    		} catch (IllegalAccessException e) {
    			// do nothing
    		} catch (InvocationTargetException e) {
    			// do nothing
    		} catch (NoSuchMethodException e) {
    			// do nothing
    		}

    		i++;
    		if (i < properties.length) {
    			sb.append(DELIMITER);
    		}
    	}

    	sb.append("}");

    	return sb.toString();
    }
}