//$Id: Parent.java,v 1.3 2005/02/13 22:46:18 epbernard Exp $package org.hibernate.test.metadata.onetomany;import org.hibernate.annotations.BatchSize;import javax.ejb.Entity;import javax.ejb.AccessType;import javax.ejb.Id;import javax.ejb.OneToMany;import javax.ejb.CascadeType;import javax.ejb.JoinColumns;import javax.ejb.JoinColumn;import java.util.Collection;import java.util.Set;import java.util.HashSet;import java.io.Serializable;/** * @author Emmanuel Bernard */@Entity(access = AccessType.FIELD)public class Parent implements Serializable {	@Id	public ParentPk id;	public int age;		@OneToMany(cascade=CascadeType.ALL)	@JoinColumns ({		@JoinColumn(name="parentCivility", referencedColumnName = "isMale"),		@JoinColumn(name="parentLastName", referencedColumnName = "lastName"),		@JoinColumn(name="parentFirstName", referencedColumnName = "firstName")	})	@BatchSize(size=5)	public Set<Child> children;	public int hashCode() {		//a NPE can occurs, but I don't expect hashcode to be used before pk is set		return id.hashCode();	}	public boolean equals(Object obj) {		//a NPE can occurs, but I don't expect equals to be used before pk is set		if (obj != null && obj instanceof Parent) {			return id.equals( ( (Parent) obj).id );		}		else {			return false;		}	}	public void addChild(Child child) {		if (children == null) {			children = new HashSet();		}		child.parent = this;		children.add(child);	}}