apache-camel - 骆驼路线中未打印的日志消息

Question

我创建了一个 Camel Context 实例，并在上下文中添加了如下路由：

camelContext.addRoutes(new RouteBuilder() {
    @Override
    public void configure() throws Exception {
        System.out.println("in add route method");
        from("direct:start").routeId("contextRoute")
                .setHeader("client_id", constant("abc"))
                .setHeader("client_secret", constant("clk"))
                .setHeader(Exchange.HTTP_METHOD, constant("POST"))
                .setHeader(Exchange.CONTENT_TYPE, constant("application/json"))
                .setHeader(Exchange.HTTP_URI, constant(url))
                .marshal(gsonDataFormat)
                .log("trying to send message")
                .to(url)
                .log("response is ${body}");
    }
});
camelContext.start();

但是我无法获取我的消息日志并调试路由。路由有问题还是日志文件有问题？