in netty.why sended 6bytes, but server recved 9bytes

[xiangqiuzhao]

my Encoder:

protected Object encode(
            ChannelHandlerContext ctx, Channel channel, Object msg) throws
Exception {
        if (!(msg instanceof String)) {
            return msg;//(1)
        }
        System.out.println("IN INCODE:" + msg); 
        buf.writeBytes(data); //6bytes
        return buf;//(3)
    }

my camelContext:

SimpleRegistry registry = new SimpleRegistry(); 
        registry.put("myEncoder", encoder); 
        CamelContext context = new DefaultCamelContext(registry);

my routeBuilder:

context.addRoutes(new RouteBuilder() {
            public void configure() throws Exception {
                from("direct:cpsp")
                .process(new MyToProcessor())
                .to("netty:tcp://localhost:6789?sync=true")
                .process(new MyFromProcessor());
            }
        });

why my server recved 9bytes??

and how camel know  the encoder i put in DefaultCamelContext?

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