Program: 168541
Project: 168541
Buggy source:
public void loadFSWithUDIFAutodetect(String filename,long pos){
  ReadableRandomAccessStream fsFile;
  try {
    if (WindowsLowLevelIO.isSystemSupported())     fsFile=new WindowsLowLevelIO(filename);
 else     fsFile=new ReadableFileStream(filename);
    try {
      if (UDIFRecognizer.isUDIF(fsFile)) {
        ReadableUDIFStream stream=null;
        try {
          stream=new ReadableUDIFStream(filename);
        }
 catch (        Exception e) {
          e.printStackTrace();
          if (e.getMessage().startsWith("String_Node_Str")) {
            JOptionPane.showMessageDialog(FileSystemBrowserWindow.this,"String_Node_Str" + "String_Node_Str" + "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          }
 else {
            JOptionPane.showMessageDialog(FileSystemBrowserWindow.this,"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          }
          return;
        }
        if (stream != null) {
          fsFile.close();
          fsFile=stream;
        }
      }
 else {
        System.err.println("String_Node_Str");
      }
    }
 catch (    Exception e) {
      System.err.println("String_Node_Str");
      e.printStackTrace();
    }
    if (pos != 0)     fsFile=new ReadableConcatenatedStream(fsFile,pos,fsFile.length() - pos);
    String displayName;
    try {
      displayName=new File(filename).getCanonicalFile().getName();
    }
 catch (    Exception e) {
      displayName=filename;
    }
    loadFS(fsFile,displayName);
  }
 catch (  Exception e) {
    System.err.println("String_Node_Str");
    e.printStackTrace();
    JOptionPane.showMessageDialog(this,"String_Node_Str" + filename + "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
  }
}

Fixed version (ground truth):
public void loadFSWithUDIFAutodetect(String filename,long pos){
  ReadableRandomAccessStream fsFile;
  try {
    if (WindowsLowLevelIO.isSystemSupported()) {
      fsFile=new WindowsLowLevelIO(filename);
    }
 else {
      fsFile=new ReadableFileStream(filename);
    }
    try {
      if (UDIFRecognizer.isUDIF(fsFile)) {
        ReadableUDIFStream stream=null;
        try {
          stream=new ReadableUDIFStream(filename);
        }
 catch (        Exception e) {
          e.printStackTrace();
          if (e.getMessage().startsWith("String_Node_Str")) {
            JOptionPane.showMessageDialog(FileSystemBrowserWindow.this,"String_Node_Str" + "String_Node_Str" + "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          }
 else {
            JOptionPane.showMessageDialog(FileSystemBrowserWindow.this,"String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
          }
          return;
        }
        if (stream != null) {
          fsFile.close();
          fsFile=stream;
        }
      }
 else {
        System.err.println("String_Node_Str");
      }
    }
 catch (    Exception e) {
      System.err.println("String_Node_Str");
      e.printStackTrace();
    }
    if (pos != 0) {
      fsFile=new ReadableConcatenatedStream(fsFile,pos,fsFile.length() - pos);
    }
    String displayName;
    try {
      displayName=new File(filename).getCanonicalFile().getName();
    }
 catch (    Exception e) {
      displayName=filename;
    }
    loadFS(fsFile,displayName);
  }
 catch (  Exception e) {
    System.err.println("String_Node_Str");
    e.printStackTrace();
    JOptionPane.showMessageDialog(this,"String_Node_Str" + filename + "String_Node_Str","String_Node_Str",JOptionPane.ERROR_MESSAGE);
  }
}