JPA：联接表语法

给定以下实体（为简洁起见，在此长定义中省略了一些列）：

@Table(name = "Products")
public class Products implements Serializable {
    private static final long serialVersionUID = 1L;
    @Id
    @Basic(optional = false)
    @Column(name = "SKU")
    private String sku;
    @Basic(optional = false)
    @Column(name = "ProductName")
    private String productName;

    private boolean allowPreOrder;
    @ManyToMany(mappedBy = "productsCollection")
    private Collection<Categories> categoriesCollection;
    @JoinTable(name = "Products_CrossSell", joinColumns = {
        @JoinColumn(name = "SKU", referencedColumnName = "SKU")}, inverseJoinColumns = {
        @JoinColumn(name = "CrossSKU", referencedColumnName = "SKU")})
    @ManyToMany
    private Collection<Products> productsCollection;
    @ManyToMany(mappedBy = "productsCollection")
    private Collection<Products> productsCollection1;
    @JoinTable(name = "Products_Related", joinColumns = {
        @JoinColumn(name = "SKU", referencedColumnName = "SKU")}, inverseJoinColumns = {
        @JoinColumn(name = "RelatedSKU", referencedColumnName = "SKU")})
    @ManyToMany
    private Collection<Products> productsCollection2;
    @ManyToMany(mappedBy = "productsCollection2")
    private Collection<Products> productsCollection3;

如何获得给定产品SKU的一组相关产品？

products_related表如下所示：

我知道如何使用SQL获取答案，但是我是JPA的新手，所以我还不太熟悉API和查询语法。