ManyToMany

@Entity
public class CategoryNews  implements Serializable
{
  @EmbeddedId
  private CategoryNews.PK pk;

  @NotNull
  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn(name = "CATEGORY_ID", referencedColumnName = "CATEGORY_ID", insertable = false, updatable = false)
  private Category category;

  @NotNull
  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn(name = "NEWS_ID", referencedColumnName = "NEWS_ID", insertable = false, updatable = false)
  private News news;

  private static final long serialVersionUID = 1L;

  public CategoryNews.PK getPk()
  {
    return this.pk;
  }

  public void setPk(CategoryNews.PK pk)
  {
    this.pk = pk;
  }

  public Category getCategory()
  {
    return category;
  }

  public void setCategory(Category category)
  {
    this.category = category;
  }

  public News getNews()
  {
    return news;
  }

  public void setNews(News news)
  {
    this.news = news;
  }
  
  @Embeddable
  public static class PK implements Serializable
  {

    @Column(name = "newsId", nullable = false)
    private Integer newsId;

    @Column(name = "categoryId", nullable = false)
    private Integer categoryId;

    private static final long serialVersionUID = 1L;

    public PK()
    {
      super();
    }

    public Integer getNewsId()
    {
      return newsId;
    }

    public void setNewsId(Integer newsId)
    {
      this.newsId = newsId;
    }

    public Integer getCategoryId()
    {
      return categoryId;
    }

    public void setCategoryId(Integer categoryId)
    {
      this.categoryId = categoryId;
    }

  }

}

@OneToMany(mappedBy = "category")
  private Collection<CategoryNews> categoryNews;

@OneToMany(mappedBy = "news")
  private Collection<News> news;