Hibernate ManyToMany e chave composta

@Entity
@Component
public class Usuario implements Serializable {
//..campos do usuario

//o cascade type precisa ser all pq preciso remover/inserir na tabela PermissaoUsuario sempre que for salvar usuario.
	@OneToMany(mappedBy = "usuario", targetEntity = PermissaoUsuario.class, fetch = FetchType.LAZY, cascade = CascadeType.ALL)
	private List<PermissaoUsuario> permissoesUsuario;

//gets/sets
}

@Table(name = "permissao_usuario")
@Entity
@Component
public class PermissaoUsuario extends DefaultModel implements Serializable {
	private static final long serialVersionUID = 4231479231876850717L;

        //merda ta aqui... n poderia ter esse id o id teria que ser Permissao + usuario
	@Id
	@SequenceGenerator(name = "sequence", sequenceName = "seq_permissao_usuario")
	@GeneratedValue(strategy = GenerationType.AUTO, generator = "sequence")
	private Long id;

	@ManyToOne(fetch = FetchType.EAGER)
	@JoinColumn(name = "permissao_id", nullable = false)
	private Permissao permissao;

	@ManyToOne(fetch = FetchType.EAGER)
	@JoinColumn(name = "usuario_id", nullable = false)
	private Usuario usuario;

	@NotEmpty
	@Column(nullable = false, length = 1)
	private String status;
//gets/sets