Program: 161241
Project: 161241
Buggy source:
private Response doSearch(final HttpServletRequest request,final String queryString,final Set<String> sources,final Set<String> inverseAttributes,final Set<String> types,final Set<String> flags,final boolean isGrsExpected){
  if (sources == null || sources.isEmpty()) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  for (  final String source : sources) {
    if (isGrsExpected) {
      if (!sourceContext.getGrsSourceNames().contains(ciString(source))) {
        throw new IllegalArgumentException(String.format("String_Node_Str",source));
      }
    }
 else     if (!sourceContext.getCurrentSource().getName().contains(ciString(source))) {
      throw new IllegalArgumentException(String.format("String_Node_Str",source));
    }
  }
  final Set<String> separateFlags=Sets.newHashSet();
  for (  final String flagParameter : flags) {
    if (QueryFlag.getValidLongFlags().contains(flagParameter)) {
      separateFlags.add(flagParameter);
    }
 else {
      final CharacterIterator charIterator=new StringCharacterIterator(flagParameter);
      for (char flag=charIterator.first(); flag != CharacterIterator.DONE; flag=charIterator.next()) {
        if (NOT_ALLOWED_SEARCH_FLAGS.contains(flag)) {
          throw new IllegalArgumentException(String.format("String_Node_Str",flag));
        }
        separateFlags.add(String.valueOf(flag));
      }
    }
  }
  final Query query=Query.parse(String.format("String_Node_Str",QueryFlag.SOURCES.getLongFlag(),JOINER.join(sources),QueryFlag.SHOW_TAG_INFO.getLongFlag(),(types == null || types.isEmpty()) ? "String_Node_Str" : QueryFlag.SELECT_TYPES.getLongFlag(),JOINER.join(types),(inverseAttributes == null || inverseAttributes.isEmpty()) ? "String_Node_Str" : QueryFlag.INVERSE.getLongFlag(),JOINER.join(inverseAttributes),Joiner.on("String_Node_Str").join(Iterables.transform(separateFlags,new Function<String,String>(){
    @Nullable @Override public String apply(    @Nullable String input){
      return QueryFlag.getValidLongFlags().contains(input) ? "String_Node_Str" + input : "String_Node_Str" + input;
    }
  }
)),(queryString == null ? "String_Node_Str" : queryString)));
  final Parameters parameters=new Parameters();
  parameters.setSources(sources);
  parameters.setQueryStrings(queryString);
  parameters.setInverseLookup(inverseAttributes);
  parameters.setTypeFilters(types);
  parameters.setFlags(separateFlags);
  return handleQuery(query,JOINER.join(sources),queryString,request,parameters);
}

Fixed version (ground truth):
private Response doSearch(final HttpServletRequest request,final String queryString,final Set<String> sources,final Set<String> inverseAttributes,final Set<String> types,final Set<String> flags,final boolean isGrsExpected){
  if (sources == null || sources.isEmpty()) {
    throw new IllegalArgumentException("String_Node_Str");
  }
  for (  final String source : sources) {
    if (isGrsExpected) {
      if (!sourceContext.getGrsSourceNames().contains(ciString(source))) {
        throw new IllegalArgumentException(String.format("String_Node_Str",source));
      }
    }
 else     if (!sourceContext.getCurrentSource().getName().contains(ciString(source))) {
      throw new IllegalArgumentException(String.format("String_Node_Str",source));
    }
  }
  final Set<String> separateFlags=Sets.newHashSet();
  for (  final String flagParameter : flags) {
    if (QueryFlag.getValidLongFlags().contains(flagParameter)) {
      separateFlags.add(flagParameter);
    }
 else {
      final CharacterIterator charIterator=new StringCharacterIterator(flagParameter);
      for (char flag=charIterator.first(); flag != CharacterIterator.DONE; flag=charIterator.next()) {
        if (NOT_ALLOWED_SEARCH_FLAGS.contains(flag) || !QueryFlag.getValidShortFlags().contains(flag)) {
          throw new IllegalArgumentException(String.format("String_Node_Str",flag));
        }
        separateFlags.add(String.valueOf(flag));
      }
    }
  }
  final Query query=Query.parse(String.format("String_Node_Str",QueryFlag.SOURCES.getLongFlag(),JOINER.join(sources),QueryFlag.SHOW_TAG_INFO.getLongFlag(),(types == null || types.isEmpty()) ? "String_Node_Str" : QueryFlag.SELECT_TYPES.getLongFlag(),JOINER.join(types),(inverseAttributes == null || inverseAttributes.isEmpty()) ? "String_Node_Str" : QueryFlag.INVERSE.getLongFlag(),JOINER.join(inverseAttributes),Joiner.on("String_Node_Str").join(Iterables.transform(separateFlags,new Function<String,String>(){
    @Override public String apply(    String input){
      return input.length() > 1 ? "String_Node_Str" + input : "String_Node_Str" + input;
    }
  }
)),(queryString == null ? "String_Node_Str" : queryString)));
  final Parameters parameters=new Parameters();
  parameters.setSources(sources);
  parameters.setQueryStrings(queryString);
  parameters.setInverseLookup(inverseAttributes);
  parameters.setTypeFilters(types);
  parameters.setFlags(separateFlags);
  return handleQuery(query,JOINER.join(sources),queryString,request,parameters);
}