Program: 69387
Project: 69387
Buggy source:
private AssessmentItemBuilder convertFIB(Item item){
  FIBAssessmentItemBuilder itemBuilder=new FIBAssessmentItemBuilder(EntryType.text,qtiSerializer);
  itemBuilder.setQuestion("String_Node_Str");
  itemBuilder.clearTextEntries();
  convertItemBasics(item,itemBuilder);
  Question question=item.getQuestion();
  boolean singleCorrect=question.isSingleCorrect();
  if (singleCorrect) {
    itemBuilder.setScoreEvaluationMode(ScoreEvaluation.allCorrectAnswers);
  }
 else {
    itemBuilder.setScoreEvaluationMode(ScoreEvaluation.perAnswer);
  }
  itemBuilder.getMinScoreBuilder().setScore(new Double(question.getMinValue()));
  itemBuilder.getMaxScoreBuilder().setScore(new Double(question.getMaxValue()));
  List<Response> responses=question.getResponses();
  StringBuilder sb=new StringBuilder();
  for (  Response response : responses) {
    if (response instanceof FIBResponse) {
      FIBResponse gap=(FIBResponse)response;
      if (FIBResponse.TYPE_BLANK.equals(gap.getType())) {
        String responseId=itemBuilder.generateResponseIdentifier();
        StringBuilder entryString=new StringBuilder();
        entryString.append("String_Node_Str").append(responseId).append("String_Node_Str");
        TextEntry entry=itemBuilder.createTextEntry(responseId);
        entry.setCaseSensitive("String_Node_Str".equals(gap.getCaseSensitive()));
        if (gap.getMaxLength() > 0) {
          entry.setExpectedLength(gap.getMaxLength());
          entryString.append("String_Node_Str").append(gap.getMaxLength()).append("String_Node_Str");
        }
 else         if (gap.getSize() > 0) {
          entry.setExpectedLength(gap.getSize());
          entryString.append("String_Node_Str").append(gap.getSize()).append("String_Node_Str");
        }
        parseAlternatives(gap.getCorrectBlank(),gap.getPoints(),entry);
        entryString.append("String_Node_Str");
        sb.append(entryString);
      }
 else       if (FIBResponse.TYPE_CONTENT.equals(gap.getType())) {
        Material text=gap.getContent();
        String htmltext=text.renderAsHtmlForEditor();
        sb.append(htmltext);
      }
    }
  }
  String fib="String_Node_Str" + sb.toString() + "String_Node_Str";
  itemBuilder.setQuestion(fib);
  return itemBuilder;
}

Fixed version (ground truth):
private AssessmentItemBuilder convertFIB(Item item){
  FIBAssessmentItemBuilder itemBuilder=new FIBAssessmentItemBuilder(EntryType.text,qtiSerializer);
  itemBuilder.setQuestion("String_Node_Str");
  itemBuilder.clearTextEntries();
  convertItemBasics(item,itemBuilder);
  Question question=item.getQuestion();
  boolean singleCorrect=question.isSingleCorrect();
  if (singleCorrect) {
    itemBuilder.setScoreEvaluationMode(ScoreEvaluation.allCorrectAnswers);
  }
 else {
    itemBuilder.setScoreEvaluationMode(ScoreEvaluation.perAnswer);
  }
  itemBuilder.getMinScoreBuilder().setScore(new Double(question.getMinValue()));
  itemBuilder.getMaxScoreBuilder().setScore(new Double(question.getMaxValue()));
  List<Response> responses=question.getResponses();
  StringBuilder sb=new StringBuilder();
  for (  Response response : responses) {
    if (response instanceof FIBResponse) {
      FIBResponse gap=(FIBResponse)response;
      if (FIBResponse.TYPE_BLANK.equals(gap.getType())) {
        String responseId=itemBuilder.generateResponseIdentifier();
        StringBuilder entryString=new StringBuilder();
        entryString.append("String_Node_Str").append(responseId).append("String_Node_Str");
        TextEntry entry=itemBuilder.createTextEntry(responseId);
        entry.setCaseSensitive("String_Node_Str".equals(gap.getCaseSensitive()));
        if (gap.getMaxLength() > 0) {
          entry.setExpectedLength(gap.getMaxLength());
          entryString.append("String_Node_Str").append(gap.getMaxLength()).append("String_Node_Str");
        }
 else         if (gap.getSize() > 0) {
          entry.setExpectedLength(gap.getSize());
          entryString.append("String_Node_Str").append(gap.getSize()).append("String_Node_Str");
        }
        parseAlternatives(gap.getCorrectBlank(),gap.getPoints(),entry);
        entryString.append("String_Node_Str");
        sb.append(entryString);
      }
 else       if (FIBResponse.TYPE_CONTENT.equals(gap.getType())) {
        Material text=gap.getContent();
        String htmltext=text.renderAsHtmlForEditor();
        htmltext=prepareContent(htmltext);
        sb.append(htmltext);
      }
    }
  }
  String fib="String_Node_Str" + sb.toString() + "String_Node_Str";
  itemBuilder.setQuestion(fib);
  return itemBuilder;
}