Program: 130924
Project: 130924
Buggy source:
private String getString(final Tag tag) throws IOException {
  int pos=tag.text().indexOf("String_Node_Str");
  final boolean fullFileRequested=pos == -1;
  if (fullFileRequested) {
    pos=tag.text().length();
  }
  final String fullyQualifiedClassName=tag.text().substring(0,pos);
  final String partialFilePath=fullyQualifiedClassName.replace('.','/').concat("String_Node_Str");
  final File testFile=findFile(fullyQualifiedClassName,partialFilePath,tag);
  String imports="String_Node_Str";
  String res="String_Node_Str";
  if (fullFileRequested) {
    final int fileLength=(int)testFile.length();
    final StringBuilder fileContents=new StringBuilder(fileLength);
    final StringBuilder importStatements=new StringBuilder(fileLength);
    String lineSeparator=System.getProperty("String_Node_Str");
    try (Scanner scanner=new Scanner(testFile)){
      Position position=Position.START;
      while (scanner.hasNextLine()) {
        final String line=scanner.nextLine();
        final String trimmedLine=line.trim();
        if (position != Position.CODE && "String_Node_Str".equals(trimmedLine)) {
        }
 else         if (position == Position.START && trimmedLine.startsWith("String_Node_Str")) {
          position=Position.IMPORTS;
        }
 else         if (position == Position.IMPORTS && trimmedLine.startsWith("String_Node_Str")) {
          importStatements.append(line + lineSeparator);
        }
 else         if (position == Position.IMPORTS || position == Position.CODE) {
          position=Position.CODE;
          fileContents.append(line + lineSeparator);
        }
 else {
          throw new IllegalStateException("String_Node_Str");
        }
      }
      res=fileContents.toString();
      imports=importStatements.toString();
    }
   }
 else {
    final String testName=tag.text().substring(pos + 1);
    final Scanner scanner=new Scanner(testFile);
    List<String> lines=new ArrayList<>();
    boolean endFound=false;
    while (scanner.hasNext() && !endFound) {
      String current=scanner.findInLine("String_Node_Str" + testName + "String_Node_Str");
      final boolean methodStartFound=current != null;
      if (methodStartFound) {
        scanner.nextLine();
        do {
          current=scanner.nextLine();
          endFound=current.equals("String_Node_Str") || current.contains("String_Node_Str");
          if (!endFound) {
            final String currentWithoutLeadingWhitspace=current.replaceFirst("String_Node_Str","String_Node_Str");
            lines.add(currentWithoutLeadingWhitspace);
          }
        }
 while (!endFound);
      }
 else {
        scanner.nextLine();
      }
    }
    for (    String s : lines) {
      res+=s + "String_Node_Str";
    }
  }
  final String htmlEscapedBody=htmlEscape(res);
  if ("String_Node_Str".equals(htmlEscapedBody)) {
    throw new RuntimeException("String_Node_Str" + tag.text());
  }
  final String htmlEscapedImports=htmlEscape(imports);
  final String tagId=tag.text().replaceAll("String_Node_Str","String_Node_Str");
  return "String_Node_Str" + tagId + "String_Node_Str"+ (fullFileRequested ? "String_Node_Str" + "String_Node_Str" + htmlEscapedImports + "String_Node_Str" : "String_Node_Str")+ "String_Node_Str"+ htmlEscapedBody+ "String_Node_Str"+ "String_Node_Str";
}

Fixed version (ground truth):
private String getString(final Tag tag) throws IOException {
  int pos=tag.text().indexOf("String_Node_Str");
  final boolean fullFileRequested=pos == -1;
  if (fullFileRequested) {
    pos=tag.text().length();
  }
  final String fullyQualifiedClassName=tag.text().substring(0,pos);
  final String partialFilePath=fullyQualifiedClassName.replace('.','/').concat("String_Node_Str");
  final File testFile=findFile(fullyQualifiedClassName,partialFilePath,tag);
  String imports="String_Node_Str";
  String res="String_Node_Str";
  if (fullFileRequested) {
    final int fileLength=(int)testFile.length();
    final StringBuilder fileContents=new StringBuilder(fileLength);
    final StringBuilder importStatements=new StringBuilder(fileLength);
    String lineSeparator=System.getProperty("String_Node_Str");
    try (Scanner scanner=new Scanner(testFile)){
      Position position=Position.START;
      while (scanner.hasNextLine()) {
        final String line=scanner.nextLine();
        final String trimmedLine=line.trim();
        if (position != Position.CODE && "String_Node_Str".equals(trimmedLine)) {
        }
 else         if (position == Position.START && trimmedLine.startsWith("String_Node_Str")) {
          position=Position.IMPORTS;
        }
 else         if (position == Position.IMPORTS && trimmedLine.startsWith("String_Node_Str")) {
          importStatements.append(line + lineSeparator);
        }
 else         if (position == Position.IMPORTS || position == Position.CODE) {
          position=Position.CODE;
          fileContents.append(line + lineSeparator);
        }
 else {
          throw new IllegalStateException("String_Node_Str");
        }
      }
      res=fileContents.toString();
      imports=importStatements.toString();
    }
   }
 else {
    final String testName=tag.text().substring(pos + 1);
    final Scanner scanner=new Scanner(testFile);
    List<String> lines=new ArrayList<>();
    boolean endFound=false;
    while (scanner.hasNext() && !endFound) {
      String current=scanner.findInLine("String_Node_Str" + testName + "String_Node_Str");
      final boolean methodStartFound=current != null;
      if (methodStartFound) {
        scanner.nextLine();
        do {
          current=scanner.nextLine();
          endFound=current.equals("String_Node_Str") || current.contains("String_Node_Str");
          if (!endFound) {
            final String currentWithoutLeadingWhitespace=current.replaceFirst("String_Node_Str","String_Node_Str");
            lines.add(currentWithoutLeadingWhitespace);
          }
        }
 while (!endFound);
      }
 else {
        scanner.nextLine();
      }
    }
    for (    String s : lines) {
      res+=s + "String_Node_Str";
    }
  }
  final String htmlEscapedBody=htmlEscape(res);
  if ("String_Node_Str".equals(htmlEscapedBody)) {
    throw new RuntimeException("String_Node_Str" + tag.text());
  }
  final String htmlEscapedImports=htmlEscape(imports);
  final String tagId=tag.text().replaceAll("String_Node_Str","String_Node_Str");
  return "String_Node_Str" + tagId + "String_Node_Str"+ (fullFileRequested ? "String_Node_Str" + "String_Node_Str" + htmlEscapedImports + "String_Node_Str" : "String_Node_Str")+ "String_Node_Str"+ htmlEscapedBody+ "String_Node_Str"+ "String_Node_Str";
}