Program: 100636
Project: 100636
Buggy source:
@Override public void startElement(final String uri,final String localName,final String qName,final Attributes atts) throws SAXException {
  final String classValue=atts.getValue(ATTRIBUTE_NAME_CLASS);
  if (rootClass == null) {
    rootClass=new DitaClass(classValue);
  }
  final String formatValue=atts.getValue(ATTRIBUTE_NAME_FORMAT);
  if (TOPIC_TOPIC.matches(classValue)) {
    topicId=atts.getValue(ATTRIBUTE_NAME_ID);
    final String filename=currentFile.toString() + QUESTION;
    for (    final ExportAnchor e : exportAnchors) {
      if (e.topicids.contains(filename)) {
        e.topicids.add(topicId);
        e.topicids.remove(filename);
      }
    }
  }
 else   if (MAP_TOPICREF.matches(classValue)) {
    parseAttribute(atts);
  }
 else   if (MAP_MAP.matches(classValue)) {
    if (rootFilePath.equals(currentFile)) {
      String pluginId=atts.getValue(ATTRIBUTE_NAME_ID);
      if (pluginId == null) {
        pluginId="String_Node_Str";
      }
      final Set<String> set=StringUtils.restoreSet(pluginId,COMMA);
      pluginMap.put("String_Node_Str",set);
    }
  }
 else   if (MAP_TOPICMETA.matches(classValue) || TOPIC_PROLOG.matches(classValue)) {
    topicMetaSet.add(qName);
  }
 else   if (DELAY_D_EXPORTANCHORS.matches(classValue)) {
    hasExport=true;
    if (rootClass != null && rootClass.matches(MAP_MAP)) {
      currentExportAnchor=new ExportAnchor(topicHref);
      currentExportAnchor.topicids.add(topicId);
    }
 else     if (rootClass == null || rootClass.matches(TOPIC_TOPIC)) {
      currentExportAnchor=new ExportAnchor(currentFile);
      currentExportAnchor.topicids.add(topicId);
      shouldAppendEndTag=true;
    }
  }
 else   if (DELAY_D_ANCHORKEY.matches(classValue)) {
    final String keyref=atts.getValue(ATTRIBUTE_NAME_KEYREF);
    currentExportAnchor.keys.add(keyref);
  }
 else   if (DELAY_D_ANCHORID.matches(classValue)) {
    final String id=atts.getValue(ATTRIBUTE_NAME_ID);
    if (rootClass != null && rootClass.matches(MAP_MAP)) {
      if (!topicId.equals(id)) {
        currentExportAnchor.ids.add(id);
      }
    }
 else     if (rootClass == null || rootClass.matches(TOPIC_TOPIC)) {
      if (!topicId.equals(id)) {
        currentExportAnchor.ids.add(id);
      }
    }
  }
  getContentHandler().startElement(uri,localName,qName,atts);
}

Fixed version (ground truth):
@Override public void startElement(final String uri,final String localName,final String qName,final Attributes atts) throws SAXException {
  final String classValue=atts.getValue(ATTRIBUTE_NAME_CLASS);
  if (rootClass == null) {
    rootClass=new DitaClass(classValue);
  }
  if (TOPIC_TOPIC.matches(classValue)) {
    topicId=atts.getValue(ATTRIBUTE_NAME_ID);
    final String filename=currentFile.toString() + QUESTION;
    for (    final ExportAnchor e : exportAnchors) {
      if (e.topicids.contains(filename)) {
        e.topicids.add(topicId);
        e.topicids.remove(filename);
      }
    }
  }
 else   if (MAP_TOPICREF.matches(classValue)) {
    parseAttribute(atts);
  }
 else   if (MAP_MAP.matches(classValue)) {
    if (rootFilePath.equals(currentFile)) {
      String pluginId=atts.getValue(ATTRIBUTE_NAME_ID);
      if (pluginId == null) {
        pluginId="String_Node_Str";
      }
      final Set<String> set=StringUtils.restoreSet(pluginId,COMMA);
      pluginMap.put("String_Node_Str",set);
    }
  }
 else   if (MAP_TOPICMETA.matches(classValue) || TOPIC_PROLOG.matches(classValue)) {
    topicMetaSet.add(qName);
  }
 else   if (DELAY_D_EXPORTANCHORS.matches(classValue)) {
    hasExport=true;
    if (rootClass != null && rootClass.matches(MAP_MAP)) {
      currentExportAnchor=new ExportAnchor(topicHref);
      currentExportAnchor.topicids.add(topicId);
    }
 else     if (rootClass == null || rootClass.matches(TOPIC_TOPIC)) {
      currentExportAnchor=new ExportAnchor(currentFile);
      currentExportAnchor.topicids.add(topicId);
      shouldAppendEndTag=true;
    }
  }
 else   if (DELAY_D_ANCHORKEY.matches(classValue)) {
    final String keyref=atts.getValue(ATTRIBUTE_NAME_KEYREF);
    currentExportAnchor.keys.add(keyref);
  }
 else   if (DELAY_D_ANCHORID.matches(classValue)) {
    final String id=atts.getValue(ATTRIBUTE_NAME_ID);
    if (rootClass != null && rootClass.matches(MAP_MAP)) {
      if (!topicId.equals(id)) {
        currentExportAnchor.ids.add(id);
      }
    }
 else     if (rootClass == null || rootClass.matches(TOPIC_TOPIC)) {
      if (!topicId.equals(id)) {
        currentExportAnchor.ids.add(id);
      }
    }
  }
  getContentHandler().startElement(uri,localName,qName,atts);
}