Program: 39639
Project: 39639
Buggy source:
@Override protected TUExecutionResult execution(File transformedAppFolder,TransformationContext transformationContext){
  Collection<File> files;
  Set<File> allFiles=new HashSet<>();
  for (  String attribute : filesAttributes) {
    files=(Collection<File>)transformationContext.get(attribute);
    if (files != null) {
      allFiles.addAll(files);
    }
  }
  boolean multipleFiles=true;
  if (allFiles.size() == 0) {
    allFiles.add(getAbsoluteFile(transformedAppFolder,transformationContext));
    multipleFiles=false;
  }
  boolean multipleConfigurations=false;
  Set propertyValues=null;
  if (propertyName != null) {
    Object propertyValuesObj=transformationContext.get(propertyAttribute);
    if (!(propertyValuesObj instanceof Set)) {
      String exceptionMessage=String.format("String_Node_Str",propertyAttribute);
      TransformationUtilityException tue=new TransformationUtilityException(exceptionMessage);
      return TUExecutionResult.error(this,tue);
    }
    propertyValues=(Set)propertyValuesObj;
    if (propertyValues.size() == 0) {
      logger.warn("String_Node_Str",propertyAttribute);
    }
 else {
      multipleConfigurations=true;
      setPropertySetter();
    }
  }
  if (logger.isDebugEnabled()) {
    logger.debug("String_Node_Str",getName(),multipleFiles);
    logger.debug("String_Node_Str",getName(),multipleConfigurations);
  }
  TransformationOperation operation;
  operations=new ArrayList<TransformationUtility>();
  int order=1;
  try {
    for (    File file : allFiles) {
      if (!multipleConfigurations) {
        operation=createClone(order,transformedAppFolder,file);
        operations.add(operation);
        order++;
      }
 else {
        Object[] propertyValuesArray=propertyValues.toArray();
        for (        Object propertyValue : propertyValuesArray) {
          operation=createClone(order,transformedAppFolder,file);
          propertySetter.invoke(operation,propertyValue);
          operations.add(operation);
          order++;
        }
      }
    }
  }
 catch (  CloneNotSupportedException e) {
    TransformationUtilityException tue=new TransformationUtilityException("String_Node_Str",e);
    return TUExecutionResult.error(this,tue);
  }
catch (  InvocationTargetException|IllegalAccessException e) {
    String exceptionMessage=String.format("String_Node_Str",propertyName,templateOperation.getClass().getName());
    TransformationUtilityException tue=new TransformationUtilityException(exceptionMessage,e);
    return TUExecutionResult.error(this,tue);
  }
  String message=null;
  if (logger.isDebugEnabled()) {
    message=String.format("String_Node_Str",getName(),operations.size(),templateOperation.getClass().getSimpleName());
  }
  return TUExecutionResult.value(this,getChildren()).setDetails(message);
}

Fixed version (ground truth):
@Override protected TUExecutionResult execution(File transformedAppFolder,TransformationContext transformationContext){
  Collection<File> files;
  Set<File> allFiles=new HashSet<>();
  for (  String attribute : filesAttributes) {
    files=(Collection<File>)transformationContext.get(attribute);
    if (files != null) {
      allFiles.addAll(files);
    }
  }
  boolean multipleFiles=true;
  if (allFiles.size() == 0) {
    if (wasFileExplicitlySet()) {
      allFiles.add(getAbsoluteFile(transformedAppFolder,transformationContext));
      multipleFiles=false;
    }
 else {
      if (logger.isDebugEnabled()) {
        logger.debug("String_Node_Str",getName());
      }
      operations=new ArrayList<TransformationUtility>();
      String message=String.format("String_Node_Str",getName(),templateOperation.getClass().getSimpleName());
      return TUExecutionResult.value(this,getChildren()).setDetails(message);
    }
  }
  boolean multipleConfigurations=false;
  Set propertyValues=null;
  if (propertyName != null) {
    Object propertyValuesObj=transformationContext.get(propertyAttribute);
    if (!(propertyValuesObj instanceof Set)) {
      String exceptionMessage=String.format("String_Node_Str",propertyAttribute);
      TransformationUtilityException tue=new TransformationUtilityException(exceptionMessage);
      return TUExecutionResult.error(this,tue);
    }
    propertyValues=(Set)propertyValuesObj;
    if (propertyValues.size() == 0) {
      logger.warn("String_Node_Str",propertyAttribute);
    }
 else {
      multipleConfigurations=true;
      setPropertySetter();
    }
  }
  if (logger.isDebugEnabled()) {
    logger.debug("String_Node_Str",getName(),multipleFiles);
    logger.debug("String_Node_Str",getName(),multipleConfigurations);
  }
  TransformationOperation operation;
  operations=new ArrayList<TransformationUtility>();
  int order=1;
  try {
    for (    File file : allFiles) {
      if (!multipleConfigurations) {
        operation=createClone(order,transformedAppFolder,file);
        operations.add(operation);
        order++;
      }
 else {
        Object[] propertyValuesArray=propertyValues.toArray();
        for (        Object propertyValue : propertyValuesArray) {
          operation=createClone(order,transformedAppFolder,file);
          propertySetter.invoke(operation,propertyValue);
          operations.add(operation);
          order++;
        }
      }
    }
  }
 catch (  CloneNotSupportedException e) {
    TransformationUtilityException tue=new TransformationUtilityException("String_Node_Str",e);
    return TUExecutionResult.error(this,tue);
  }
catch (  InvocationTargetException|IllegalAccessException e) {
    String exceptionMessage=String.format("String_Node_Str",propertyName,templateOperation.getClass().getName());
    TransformationUtilityException tue=new TransformationUtilityException(exceptionMessage,e);
    return TUExecutionResult.error(this,tue);
  }
  String message=null;
  if (logger.isDebugEnabled()) {
    message=String.format("String_Node_Str",getName(),operations.size(),templateOperation.getClass().getSimpleName());
  }
  return TUExecutionResult.value(this,getChildren()).setDetails(message);
}