private synchronized RunningJobImpl get(final String jobIdentifier) {
    final RunningJobImpl result = this.jobs.get(jobIdentifier);
    if (null == result) {
      throw new RuntimeException("Trying to get a RunningJob that is unknown: " + jobIdentifier);
    }
    return result;
  }
private synchronized RunningJobImpl get ( final String jobIdentifier ) { final RunningJobImpl result = this . jobs . get ( jobIdentifier ) ; if ( null == result ) { throw new RuntimeException ( "Trying to get a RunningJob that is unknown: " + jobIdentifier ) ; } return result ; }
A guarded get() that throws an exception if the RunningJob isn't known.

@param jobIdentifier
@return