@Entity
@Table( name = "T_TABLE_LM" )
@IdClass( ClasseLM_pk.class )
public class ClasseLM implements Serializable
{
  @Id
  @Column( name = "LM_ID_L_FK", nullable = false )
  private Long idL;
  
  @Id
  @Column( name = "LM_ID_M_FK", nullable = false )
  private Long idM;
  
  @Column( name = "LM_OPTIONS" )
  private String options;
  
  @ManyToOne( cascade = CascadeType.PERSIST )
  @JoinColumn( name = "LM_ID_L_FK", insertable = false, updatable = false )
  private ClasseL classeL;
  
  @ManyToOne( cascade = CascadeType.PERSIST )
  @JoinColumn( name = "LM_ID_M_FK", insertable = false, updatable = false )
  private ClasseM classeM;
...