code: public Pager<Commit> getCommits(Object projectIdOrPath, String ref, Date since, Date until, String path, int itemsPerPage) throws GitLabApiException {
          Form formData = new GitLabApiForm()
                  .withParam("ref_name", ref)
                  .withParam("since", ISO8601.toString(since, false))
                  .withParam("until", ISO8601.toString(until, false))
                  .withParam("path", (path == null ? null : urlEncode(path)));
          return (new Pager<Commit>(this, Commit.class, itemsPerPage, formData.asMap(),  "projects", getProjectIdOrPath(projectIdOrPath), "repository", "commits"));
      }
docs: Get a Pager of repository commits in a project
  
  <pre><code>GitLab Endpoint: GET /projects/:id/repository/commits</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param ref the name of a repository branch or tag or if not given the default branch
  @param since only commits after or on this date will be returned
  @param until only commits before or on this date will be returned
  @param itemsPerPage the number of Commit instances that will be fetched per page
  @param path the path to file of a project
  @return a Pager containing the commits for the specified project ID
  @throws GitLabApiException GitLabApiException if any exception occurs during execution