Program: 93729
Project: 93729
Buggy source:
/** 
 * This will iterate through the list of the parsed providers from the lowest to the highest priority and associate each known   {@link DiffElement} to a merger in order of their provider's priority.
 * @param fileExtension File extension on which the provider can apply its mergers.
 * @return The map of the merger associated to given {@link DiffElement}s.
 */
private static Map<Class<? extends DiffElement>,Class<? extends IMerger>> getMergerTypes(String fileExtension){
  if (!fileExtension.equals(lastExtension)) {
    lastExtension=fileExtension;
    MERGER_TYPES.clear();
    final int[] priorities={EngineConstants.PRIORITY_LOWEST,EngineConstants.PRIORITY_LOW,EngineConstants.PRIORITY_NORMAL,EngineConstants.PRIORITY_HIGH,EngineConstants.PRIORITY_HIGHEST};
    for (    int priority : priorities) {
      final Map<Class<? extends DiffElement>,Class<? extends IMerger>> mergers=new EMFCompareMap<Class<? extends DiffElement>,Class<? extends IMerger>>();
      if (PARSED_PROVIDERS.containsKey(ALL_EXTENSIONS)) {
        final List<MergerProviderDescriptor> list=PARSED_PROVIDERS.get(ALL_EXTENSIONS);
        Collections.sort(list);
        for (        MergerProviderDescriptor descriptor : list) {
          if (descriptor.getPriorityValue(descriptor.priority) == priority) {
            mergers.putAll(descriptor.getMergerProviderInstance().getMergers());
          }
        }
      }
      if (PARSED_PROVIDERS.containsKey(fileExtension)) {
        final List<MergerProviderDescriptor> list=PARSED_PROVIDERS.get(fileExtension);
        Collections.sort(list);
        for (        MergerProviderDescriptor descriptor : list) {
          if (descriptor.getPriorityValue(descriptor.priority) == priority) {
            mergers.putAll(descriptor.getMergerProviderInstance().getMergers());
          }
        }
      }
      MERGER_TYPES.putAll(mergers);
    }
  }
  return MERGER_TYPES;
}

Fixed version (ground truth):
/** 
 * This will iterate through the list of the parsed providers from the lowest to the highest priority and associate each known   {@link DiffElement} to a merger in order of their provider's priority.
 * @param fileExtension File extension on which the provider can apply its mergers.
 * @return The map of the merger associated to given {@link DiffElement}s.
 */
private static Map<Class<? extends DiffElement>,Class<? extends IMerger>> getMergerTypes(String fileExtension){
  if (!fileExtension.equals(lastExtension)) {
    lastExtension=fileExtension;
    MERGER_TYPES.clear();
    for (    final int priority : MERGER_PRIORITIES) {
      final Map<Class<? extends DiffElement>,Class<? extends IMerger>> mergers=new EMFCompareMap<Class<? extends DiffElement>,Class<? extends IMerger>>();
      if (PARSED_PROVIDERS.containsKey(ALL_EXTENSIONS)) {
        final List<MergerProviderDescriptor> list=PARSED_PROVIDERS.get(ALL_EXTENSIONS);
        Collections.sort(list);
        for (        final MergerProviderDescriptor descriptor : list) {
          if (descriptor.getPriorityValue(descriptor.priority) == priority) {
            mergers.putAll(descriptor.getMergerProviderInstance().getMergers());
          }
        }
      }
      if (PARSED_PROVIDERS.containsKey(fileExtension)) {
        final List<MergerProviderDescriptor> list=PARSED_PROVIDERS.get(fileExtension);
        Collections.sort(list);
        for (        final MergerProviderDescriptor descriptor : list) {
          if (descriptor.getPriorityValue(descriptor.priority) == priority) {
            mergers.putAll(descriptor.getMergerProviderInstance().getMergers());
          }
        }
      }
      MERGER_TYPES.putAll(mergers);
    }
  }
  return MERGER_TYPES;
}