code: public List<Project> getUserProjects(Object userIdOrUsername, ProjectFilter filter, int page, int perPage) throws GitLabApiException {
          GitLabApiForm formData = filter.getQueryParams(page, perPage);
          Response response = get(Response.Status.OK, formData.asMap(),
                  "users", getUserIdOrUsername(userIdOrUsername), "projects");
          return (response.readEntity(new GenericType<List<Project>>() {}));
      }
docs: Get a list of visible projects owned by the given user in the specified page range.
  
  <pre><code>GET /users/:user_id/projects</code></pre>
  
  @param userIdOrUsername the user ID, username of the user, or a User instance holding the user ID or username
  @param filter the ProjectFilter instance holding the filter values for the query
  @param page the page to get
  @param perPage the number of projects per page
  @return a list of visible projects owned by the given use
  @throws GitLabApiException if any exception occurs