public final MessageBuilder withPayload(byte[] payload) {
        if (this.body != null) {
            throw new IllegalArgumentException("Message body is exists.");
        }
        this.payload = payload;
        return this;
    }
Configure message payload if the message body object is not exists.

@param payload
@return
@since 1.4.5
metamorphosis-client/src/main/java/com/taobao/metamorphosis/client/extension/spring/MessageBuilder.java