code: public byte[] getByteArray(final String key, final byte[] def) {
  		try {
  			final byte[] result = getByteArray(key);
  			return result != null ? result : def;
  		} catch (final NumberFormatException nfe) {
  			return def;
  		}
  	}
docs: Gets the byte array.
  
  @param key
  the key
  @param def
  the def
  @return the byte array