Steps to reproduce:

• Log in
• Run any job that's marked as a manual step
• The build should now say "Started by user <logged_in_username>"
• The api/xml for the build should have both a userId and userName xml tag for your user.
• Restart Jenkins

What is displayed?

• Build will say "started by anonymous"
• api/xml for the build will have userName, but not userId
• In script console, getUserId() for the build's MyUserIdCause returns null:
  def getJobCause(jobName, jobNumber) {
  def job = Jenkins.getInstance().getItemByFullName(jobName, Job.class);
  def build = job.getBuildByNumber(jobNumber);
  def actions = build.getActions(hudson.model.CauseAction)[0];
  actions.getCauses()[0];
  }

cause = getJobCause(<my_job_name>, <my_build_number>);
println cause.getUserId(); // this will return null

What is expected?

• Build to display "Started by user <logged_in_username>"
• The cause userId to not be null in both rest api and groovy api.