code: public Set<UserView> getAllActiveUsersForProject(ProjectView projectView) throws IntegrationException {
          Set<UserView> users = new HashSet<>();
  
          List<AssignedUserGroupView> assignedGroups = getAssignedGroupsToProject(projectView);
          for (AssignedUserGroupView assignedUserGroupView : assignedGroups) {
              if (assignedUserGroupView.getActive()) {
                  UserGroupView userGroupView = blackDuckService.getResponse(assignedUserGroupView.getGroup(), UserGroupView.class);
                  if (userGroupView.getActive()) {
                      List<UserView> groupUsers = blackDuckService.getAllResponses(userGroupView, UserGroupView.USERS_LINK_RESPONSE);
                      users.addAll(groupUsers);
                  }
              }
          }
  
          List<AssignedUserView> assignedUsers = getAssignedUsersToProject(projectView);
          for (AssignedUserView assignedUser : assignedUsers) {
              UserView userView = blackDuckService.getResponse(assignedUser.getUser(), UserView.class);
              users.add(userView);
          }
  
          return users
                         .stream()
                         .filter(userView -> userView.getActive())
                         .collect(Collectors.toSet());
      }
docs: This will get all explicitly assigned users for a project, as well as all users who are assigned to groups that are explicitly assigned to a project.