当Camel rest-dsl发生异常时如何封送到JSON/XML

rest("/api")
    .post("/endpoint")
    .route()
    .onException(Exception.class)
        .handled(true)
        .process(new Processor() {
            @Override
            public void process(Exchange exchange) throws Exception {
                Exception exception = exchange.getProperty(Exchange.EXCEPTION_CAUGHT, Exception.class);
                // 将异常信息封送到JSON格式
                String json = "{\"error\": \"" + exception.getMessage() + "\"}";
                exchange.getIn().setBody(json);
                exchange.getIn().setHeader(Exchange.CONTENT_TYPE, "application/json");
            }
        })
    .end()
    .to("direct:processRequest");

from("direct:processRequest")
    .process(new Processor() {
        @Override
        public void process(Exchange exchange) throws Exception {
            // 处理请求逻辑
        }
    });