Exception in thread "main" java.io.IOException: Stream closed

Hello, I have written the following simple program but I am getting this exception :
 Exception in thread "main" java.io.IOException: Stream closed

Can someone help me to fix this problem.

The program is :

public class Reading_TextFile {
   public static void main(String[] args) throws IOException {
      Reading_TextFile rf = new Reading_TextFile();
      InputStream is = rf.getClass().getResourceAsStream("ReadData.txt");
      BufferedInputStream bis = new BufferedInputStream(is);
      String str = "";
      while((bis.available()) != -1) {
            str  = str + Character.valueOf((char)bis.read());
      }
      System.out.println(str);
      bis.close();
      is.close();      
  }
}