Collection sources = this.sourceManager.getSources(type);
Collection sources = this.getSourceManager().getSources(type);
 public Collection getSources(String subjectTypeId) {  SubjectType type = SubjectTypeEnum.valueOf(subjectTypeId);  Collection sources = this.sourceManager.getSources(type);    // Sometimes, SourceManaget.getSources() returns null. We want to avoid  // doing that.  if (sources == null)  {    sources = new HashSet();  }    return sources; }