java - apache camel中的“缺少某些字段（可选或强制），行：1”是什么错误？

Question

我尝试使用 apache camel 和 bindy 将 csv 文件转换为对象列表。

我试着像这里http://www.mastertheintegration.com/camel/transforming-data-with-camel/transforming-csv-to-java-objects-using-camel.html

不幸的是，我收到了这个错误：

Exhausted after delivery attempt: 1 caught: java.lang.IllegalArgumentException: Some fields are missing (optional or mandatory), line : 1
java.lang.IllegalArgumentException: Some fields are missing (optional or mandatory), line : 1

这是我的课程：

主.java

public class Main {
    public static void main(String args[]) throws Exception {
        CamelContext context = new DefaultCamelContext();
        final DataFormat bindy = new BindyCsvDataFormat("model");
        context.addRoutes(new RouteBuilder() {
            public void configure() {
                from("http4://127.0.0.1:18080/?filename=data2.csv").unmarshal(bindy).process(new CsvFileTransformService());
            }
        });
        context.start();
        Thread.sleep(10000);
        context.stop();
    }
}

CSVFileTransformService.java

public class CsvFileTransformService implements Processor {
    Logger log = LoggerFactory.getLogger(CsvFileTransformService.class);

    @Override
    public void process(Exchange exchange) throws Exception {

        ArrayList<HashMap<String, Object>> list = (ArrayList) exchange.getIn()
                .getBody();
        for (HashMap<String, Object> map : list) {
            for (String key : map.keySet()) {

                log.debug("key : " + key);
                CsvBean csvBean = (CsvBean) map.get(key);
                log.debug("csvBean : " + csvBean);
            }
        }
    }
}

CSVBean.java

@CsvRecord(separator = ",")
public class CsvBean implements Serializable {

    @DataField(pos = 1)
    private String first;

    public String getFirst() {
        return first;
    }

    public void setFirst(String first) {
        this.first = first;
    }

    public String getSecond() {
        return second;
    }

    public void setSecond(String second) {
        this.second = second;
    }

    @DataField(pos = 2)
    private String second;

    @Override
    public String toString() {
        return "CsvBean{" +
                "first='" + first + '\'' +
                ", second='" + second + '\'' +
                '}';
    }
}

谢谢！