Sample of Hibernate Annotation on Entity Bean Associations/Relationships

1. one-one

@Entity
public class Body {
    @Id
    public Long getId() { return id; }

    @OneToOne(cascade = CascadeType.ALL)
    @PrimaryKeyJoinColumn
    public Heart getHeart() {
        return heart;
    }
    ...
}

@Entity
public class Heart {
    @Id
    public Long getId() { ...}
}

@Entity
public class Customer implements Serializable {
    @OneToOne(cascade = CascadeType.ALL)
    @JoinColumn(name="passport_fk")
    public Passport getPassport() {
        ...
    }

@Entity
public class Passport implements Serializable {
    @OneToOne(mappedBy = "passport")
    public Customer getOwner() {
    ...
}

2. many-one

    @ManyToOne(fetch = FetchType.EAGER)
    @org.hibernate.annotations.Cascade(value={org.hibernate.annotations.CascadeType.SAVE_UPDATE}) 
    @JoinColumn(name = "SecurityID")
    public SecurityMaster getSecurity()
    {
        return this.security;
    }

3. one-many

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "transactionId")
    @OrderBy("transactionTaxlotId asc")
    public Set<TransactionTaxlot> getTransactionTaxlots() {
        return transactionTaxlots;
    }

4. many-many

    @ManyToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinTable(name = "trelTrader",
        joinColumns = {
          @JoinColumn(name="traderId", unique = true)           
        },
        inverseJoinColumns = {
          @JoinColumn(name="fundId")
        }
    )
    public Set<Fund> getFunds() {
        return this.funds;
    }