Technoblog

public static double method(int, int);

classWithFactory := is T, class { 
    no public constructor; 
    public static T method;
}

@Entity
@Table(name = "item")
public class Item {
 
    private Integer id;
    private String name;
    private List<ProductItem> productItems = new LinkedList<ProductItem>();
 
    public Item() {
    }
 
    @Id
    @GenericGenerator(name = "generator", strategy = "increment")
    @GeneratedValue(generator = "generator")
    @Column(name = "item_id", nullable = false)
    public Integer getId() {
        return this.id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    @Column(name = "name")
    public String getName() {
        return this.name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.item")
    public List<ProductItem> getProductItems() {
        return this.productItems;
    }
 
    public void setProductItems(List<ProductItem> productItems) {
        this.productItems = productItems;
    }
}

@Entity
@Table(name = "product")
public class Product {
 
    private Integer id;
    private String name;
    private List<ProductItem> productItems = new LinkedList<ProductItem>();
 
    public Product() {
    }
 
    @Id
    @GenericGenerator(name = "generator", strategy = "increment")
    @GeneratedValue(generator = "generator")
    @Column(name = "product_id", nullable = false)
    public Integer getId() {
        return this.id;
    }
 
    public void setId(Integer id) {
        this.id = id;
    }
 
    @Column(name = "name")
    public String getName() {
        return this.name;
    }
 
    public void setName(String name) {
        this.name = name;
    }
 
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "pk.product")
    public List<ProductItem> getProductItems() {
        return this.productItems;
    }
 
    public void setProductItems(List<ProductItem> productItems) {
        this.productItems = productItems;
    }
}

@Entity
@Table(name = "product_item")
@AssociationOverrides({
@AssociationOverride(name = "pk.item", joinColumns = @JoinColumn(name = "item_id")),
@AssociationOverride(name = "pk.product", joinColumns = @JoinColumn(name = "product_id"))
        })
public class ProductItem {
 
    private ProductItemPk pk = new ProductItemPk();
 
    @EmbeddedId
    private ProductItemPk getPk() {
        return pk;
    }
 
    private void setPk(ProductItemPk pk) {
        this.pk = pk;
    }
 
    @Transient
    public Item getItem() {
        return getPk().getItem();
    }
 
    public void setItem(Item item) {
        getPk().setItem(item);
    }
 
    @Transient
    public Product getProduct() {
        return getPk().getProduct();
    }
 
    public void setProduct(Product product) {
        getPk().setProduct(product);
    }
 
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
 
        ProductItem that = (ProductItem) o;
 
        if (getPk() != null ? !getPk().equals(that.getPk()) : that.getPk() != null) return false;
 
        return true;
    }
 
    public int hashCode() {
        return (getPk() != null ? getPk().hashCode() : 0);
    }
}

@Embeddable
public class ProductItemPk implements Serializable {
 
    private Item item;
    private Product product;
 
    @ManyToOne
    public Item getItem() {
        return item;
    }
 
    public void setItem(Item item) {
        this.item = item;
    }
 
    @ManyToOne
    public Product getProduct() {
        return product;
    }
 
    public void setProduct(Product product) {
        this.product = product;
    }
 
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;
 
        ProductItemPk that = (ProductItemPk) o;
 
        if (item != null ? !item.equals(that.item) : that.item != null) return false;
        if (product != null ? !product.equals(that.product) : that.product != null)
            return false;
 
        return true;
    }
 
    public int hashCode() {
        int result;
        result = (item != null ? item.hashCode() : 0);
        result = 31 * result + (product != null ? product.hashCode() : 0);
        return result;
    }
}

<html xmlns="http://www.w3.org/1999/xhtml">
<body>
<table>
    <tr>
        <td>
            <table style="table-layout:fixed">
                <col width="20"/>
            </table>
        </td>
    </tr>
</table>
</body>
</html>