code: public final void setCharsetName(String charsetName) {
  		if (!Charset.isSupported(charsetName))
  			throw new IllegalArgumentException(
  					"The specified charset [" + charsetName + "] is not supported by the jvm.");
  		this.charsetName = charsetName;
  	}
docs: Set the charsetname to be used to interpret and generate resource.
  
  @param charsetName
  the charset name to set