@Deprecated
    // TODO: Remove when stanza builder is ready.
    public Body addBody(String language, String body) {
        language = Stanza.determineLanguage(this, language);

        removeBody(language);

        Body messageBody = new Body(language, body);
        addExtension(messageBody);
        return messageBody;
    }
@Test(expected = NullPointerException.class)
    public void setNullMessageBodyTest() {
        StanzaBuilder.buildMessage()
                        .addBody(null, null)
                        .build();
    }