Program: 187976
Project: 187976
Buggy source:
/** 
 * Import the pony from file using the cowsay format
 * @return  The pony
 */
protected Pony importCow(){
  this.version++;
  InputStream stdin=System.in;
  try {
    InputStream in=System.in;
    if (this.file != null)     in=new BufferedInputStream(new FileInputStream(this.file));
    Scanner sc=new Scanner(in,"String_Node_Str");
    StringBuilder cow=new StringBuilder();
    StringBuilder data=new StringBuilder();
    boolean meta=false;
    while (sc.hasNextLine()) {
      String line=sc.nextLine();
      if (line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").startsWith("String_Node_Str")) {
        if (meta == false) {
          meta=true;
          data.append("String_Node_Str");
        }
        line=line.substring(line.indexOf("String_Node_Str") + 1);
        if (line.equals("String_Node_Str"))         line="String_Node_Str";
        data.append(line);
        data.append('\n');
      }
 else {
        line=line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        cow.append(line);
        cow.append('\n');
      }
    }
    if (meta)     data.append("String_Node_Str");
    String pony=cow.toString();
    pony=pony.substring(pony.indexOf("String_Node_Str") + 8);
    pony=pony.substring(pony.indexOf("String_Node_Str") + 2);
    String eop=pony.substring(0,pony.indexOf("String_Node_Str"));
    if (eop.startsWith("String_Node_Str"))     pony=eop.substring(1);
 else {
      pony=pony.substring(pony.indexOf('\n') + 1);
      pony=pony.substring(0,pony.indexOf('\n' + eop + '\n'));
    }
    data.append("String_Node_Str" + (pony.indexOf("String_Node_Str") + 2) + "String_Node_Str");
    data.append(pony);
    final byte[] streamdata=data.toString().getBytes("String_Node_Str");
    System.setIn(new InputStream(){
      int ptr=0;
      @Override public int read(){
        if (this.ptr == streamdata.length)         return -1;
        return streamdata[this.ptr++] & 255;
      }
      @Override public int available(){
        return streamdata.length - this.ptr;
      }
    }
);
    this.file=null;
    return this.importPony();
  }
  finally {
    System.setIn(stdin);
  }
}

Fixed version (ground truth):
/** 
 * Import the pony from file using the cowsay format
 * @return  The pony
 * @throws IOException  On I/O error
 */
protected Pony importCow() throws IOException {
  this.version++;
  InputStream stdin=System.in;
  try {
    InputStream in=System.in;
    if (this.file != null)     in=new BufferedInputStream(new FileInputStream(this.file));
    Scanner sc=new Scanner(in,"String_Node_Str");
    StringBuilder cow=new StringBuilder();
    StringBuilder data=new StringBuilder();
    boolean meta=false;
    while (sc.hasNextLine()) {
      String line=sc.nextLine();
      if (line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str").startsWith("String_Node_Str")) {
        if (meta == false) {
          meta=true;
          data.append("String_Node_Str");
        }
        line=line.substring(line.indexOf("String_Node_Str") + 1);
        if (line.equals("String_Node_Str"))         line="String_Node_Str";
        data.append(line);
        data.append('\n');
      }
 else {
        line=line.replace("String_Node_Str","String_Node_Str").replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        line=line.replace("String_Node_Str","String_Node_Str");
        cow.append(line);
        cow.append('\n');
      }
    }
    if (meta)     data.append("String_Node_Str");
    String pony=cow.toString();
    pony=pony.substring(pony.indexOf("String_Node_Str") + 8);
    pony=pony.substring(pony.indexOf("String_Node_Str") + 2);
    String eop=pony.substring(0,pony.indexOf("String_Node_Str"));
    if (eop.startsWith("String_Node_Str"))     pony=eop.substring(1);
 else {
      pony=pony.substring(pony.indexOf('\n') + 1);
      pony=pony.substring(0,pony.indexOf('\n' + eop + '\n'));
    }
    data.append("String_Node_Str" + (pony.indexOf("String_Node_Str") + 2) + "String_Node_Str");
    data.append(pony);
    final byte[] streamdata=data.toString().getBytes("String_Node_Str");
    System.setIn(new InputStream(){
      int ptr=0;
      @Override public int read(){
        if (this.ptr == streamdata.length)         return -1;
        return streamdata[this.ptr++] & 255;
      }
      @Override public int available(){
        return streamdata.length - this.ptr;
      }
    }
);
    this.file=null;
    return this.importPony();
  }
  finally {
    System.setIn(stdin);
  }
}