Program: 41514
Project: 41514
Buggy source:
private String generatePropertyValueFromConcatQuery(String targetPropertyRef,List<NodeInstance> nodeInstance){
  String testQuery=targetPropertyRef.trim();
  if (!testQuery.endsWith("String_Node_Str")) {
    return null;
  }
  int functionOpeningBracket=testQuery.indexOf("String_Node_Str");
  String functionString=testQuery.substring(0,functionOpeningBracket);
  if (!functionString.equals("String_Node_Str")) {
    return null;
  }
  String functionContent=testQuery.substring(functionOpeningBracket + 1,testQuery.lastIndexOf("String_Node_Str")).trim();
  String[] functionParts=functionContent.split("String_Node_Str");
  List<String> augmentedFunctionParts=new ArrayList<String>();
  for (  String functionPart : functionParts) {
    if (functionPart.trim().startsWith("String_Node_Str")) {
      augmentedFunctionParts.add(functionPart.trim());
    }
 else     if (functionPart.trim().split("String_Node_Str").length == 3) {
      String[] queryParts=functionPart.trim().split("String_Node_Str");
      if (!queryParts[1].equals("String_Node_Str")) {
        return null;
      }
      String nodeTemplateName=queryParts[0];
      String propertyName=queryParts[2];
      String propValue=fetchPropertyValueFromNodeInstance(getNodeInstanceWithName(nodeInstance,nodeTemplateName),propertyName);
      augmentedFunctionParts.add("String_Node_Str" + propValue + "String_Node_Str");
    }
  }
  String resultString="String_Node_Str";
  for (  String functionPart : augmentedFunctionParts) {
    resultString+=functionPart.replace("String_Node_Str","String_Node_Str");
  }
  return resultString;
}

Fixed version (ground truth):
private String generatePropertyValueFromConcatQuery(String targetPropertyRef,List<NodeInstance> nodeInstance){
  String testQuery=targetPropertyRef.trim();
  if (!testQuery.endsWith("String_Node_Str")) {
    return null;
  }
  int functionOpeningBracket=testQuery.indexOf("String_Node_Str");
  String functionString=testQuery.substring(0,functionOpeningBracket);
  if (!functionString.equals("String_Node_Str")) {
    return null;
  }
  String functionContent=testQuery.substring(functionOpeningBracket + 1,testQuery.lastIndexOf("String_Node_Str")).trim();
  String[] functionParts=functionContent.split("String_Node_Str");
  List<String> augmentedFunctionParts=new ArrayList<String>();
  for (  String functionPart : functionParts) {
    if (functionPart.trim().startsWith("String_Node_Str")) {
      augmentedFunctionParts.add(functionPart.trim());
    }
 else     if (functionPart.trim().split("String_Node_Str").length == 3) {
      String[] queryParts=functionPart.trim().split("String_Node_Str");
      if (!queryParts[1].equals("String_Node_Str")) {
        return null;
      }
      String nodeTemplateName=queryParts[0];
      String propertyName=queryParts[2];
      if (getNodeInstanceWithName(nodeInstance,nodeTemplateName) != null) {
        String propValue=fetchPropertyValueFromNodeInstance(getNodeInstanceWithName(nodeInstance,nodeTemplateName),propertyName);
        augmentedFunctionParts.add("String_Node_Str" + propValue + "String_Node_Str");
      }
    }
  }
  String resultString="String_Node_Str";
  for (  String functionPart : augmentedFunctionParts) {
    resultString+=functionPart.replace("String_Node_Str","String_Node_Str");
  }
  return resultString;
}