Customer.java

package com.oreilly.springdata.roo.domain;

import java.util.HashSet;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Embedded;
import javax.persistence.OneToMany;
import javax.validation.constraints.NotNull;
import org.springframework.roo.addon.javabean.RooJavaBean;
import org.springframework.roo.addon.jpa.entity.RooJpaEntity;
import org.springframework.roo.addon.tostring.RooToString;

@RooJavaBean
@RooToString
@RooJpaEntity
public class Customer {

    @NotNull
    private String firstName;

    @NotNull
    private String lastName;

    @Embedded
    private EmailAddress emailAddress;

    @OneToMany(cascade = CascadeType.ALL)
    private Set<Address> addresses = new HashSet<Address>();
}