code: protected Person createPerson(final LoginContext _login)
          throws EFapsException
      {
          Person person = null;
  
          for (final JAASSystem system : JAASSystem.getAllJAASSystems()) {
              final Set<?> users = _login.getSubject().getPrincipals(system.getPersonJAASPrincipleClass());
              for (final Object persObj : users) {
                  try {
                      final String persKey = (String) system.getPersonMethodKey().invoke(persObj);
                      final String persName = (String) system.getPersonMethodName().invoke(persObj);
  
                      if (person == null) {
                          person = Person.createPerson(system, persKey, persName, null);
                      } else {
                          person.assignToJAASSystem(system, persKey);
                      }
                  } catch (final IllegalAccessException e) {
                      LoginHandler.LOG.error("could not execute a person method for system " + system.getName(), e);
                      throw new EFapsException(LoginHandler.class, "IllegalAccessException", e);
                  } catch (final IllegalArgumentException e) {
                      LoginHandler.LOG.error("could not execute a person method for system " + system.getName(), e);
                      throw new EFapsException(LoginHandler.class, "IllegalArgumentException", e);
                  } catch (final InvocationTargetException e) {
                      LoginHandler.LOG.error("could not execute a person method for system " + system.getName(), e);
                      throw new EFapsException(LoginHandler.class, "InvocationTargetException", e);
                  }
              }
          }
          return person;
      }
docs: The person represented in the JAAS login context is created and
  associated to eFaps. If the person is defined in more than one JAAS
  system, the person is also associated to the other JAAS systems.
  
  @param _login    JAAS login context
  @return Java instance of newly created person
  @throws EFapsException if a method of the principals inside the JAAS
  login contexts could not be executed.