code: private Class getClassFromStream(InputStream stream, String classname, File container)
              throws IOException, SecurityException {
          ByteArrayOutputStream baos = new ByteArrayOutputStream();
          int bytesRead = -1;
          byte[] buffer = new byte[BUFFER_SIZE];
  
          while ((bytesRead = stream.read(buffer, 0, BUFFER_SIZE)) != -1) {
              baos.write(buffer, 0, bytesRead);
          }
          byte[] classData = baos.toByteArray();
          return defineClassFromData(container, classData, classname);
      }
docs: Reads a class definition from a stream.
  
  @param stream The stream from which the class is to be read.
  Must not be <code>null</code>.
  @param classname The name of the class in the stream.
  Must not be <code>null</code>.
  @param container the file or directory containing the class.
  
  @return the Class object read from the stream.
  
  @exception IOException if there is a problem reading the class from the
  stream.
  @exception SecurityException if there is a security problem while
  reading the class from the stream.