Hibernate Nao persiste tabela associativa no manyTomany

@Entity
@Table (name="NEWS") 
public class NewsTO implements Serializable{
	

	private static final long serialVersionUID = 1L;
	//newsId da noticia
	private Long newsId;
	//titulo da noticia
	private String title;
	//conteudo noticia
	private String content;
	//descricao noticia
	private String description;
	//fontes noticia
	private List<NewsSourceTO> source;
	//categorias da noticia
	private List<CategoryTO> categories;
	//data noticia
	private Date date;

	
	@Column (length=2000)
	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	@Temporal(TemporalType.TIMESTAMP)
	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	@ManyToMany
	public List<NewsSourceTO> getSource() {
		return source;
	}

	public void setSource(List<NewsSourceTO> source) {
		this.source = source;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}


	@ManyToMany(cascade=CascadeType.ALL, fetch=FetchType.EAGER)
	public List<CategoryTO> getCategories() {
		return categories;
	}

	public void setCategories(List<CategoryTO> categories) {
		this.categories = categories;
	}

	@Id 
	@GeneratedValue(strategy=GenerationType.AUTO)
	public Long getNewsId() {
		return newsId;
	}

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

}

@Entity
@Table(name = "CATEGORY")
public class CategoryTO implements Serializable {
	
	private static final long serialVersionUID = 1L;

	// id da categoria
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private Long id;

	// nome da ctegoria
	private String categoryName;

	// tipo da categoria
	private Integer categoryType;

	public String getCategoryName() {
		return categoryName;
	}

	public void setCategoryName(String categoryName) {
		this.categoryName = categoryName;
	}


	public Long getId() {
		return id;
	}

	public void setId(Long id) {
		this.id = id;
	}

	public Integer getCategoryType() {
		return categoryType;
	}

	public void setCategoryType(Integer categoryType) {
		this.categoryType = categoryType;
	}
}