您好，我正在尝试在hp alm中记录缺陷。我写了一个java程序。这给了我错误500。因为我想把同一个身份证

我获取了缺陷url：

   String defectUrl = conn.buildEntityCollectionUrl("defect");
    defectUrl += "/98";

    Map<String, String> requestHeaders = new HashMap<String, String>();
    requestHeaders.put("Accept", "application/xml");

    Response res = conn.httpGet(defectUrl, null, requestHeaders);

然后更改字段值：

    List<Field> fields = entity.getFields().getField();

    for (Field f : fields) {
        if (f.getName().equalsIgnoreCase("id"))
        {
            int i=f.hashCode();
            System.out.println(i);
            f.getValue().clear();
            f.setName("");
        }
    }

抛出错误作为对象字段不应该存在，并且不能得到我应该放置什么来代替字段

我的整个Marshalingutils课程如下：

package org.hp.qc.web.restapi.docexamples.docexamples.infrastructure;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.bind.Marshaller;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
//import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class EntityMarshallingUtils {
 private EntityMarshallingUtils() {}
@SuppressWarnings("unchecked")
    public static <T> T marshal(Class<T> c, String xml) throws JAXBException     {
        T res;

        if (c == xml.getClass()) {
            res = (T) xml;
        }

        else {
            JAXBContext ctx = JAXBContext.newInstance(c);
            Unmarshaller marshaller = ctx.createUnmarshaller();
            res = (T) marshaller.unmarshal(new StringReader(xml));
        }

        return res;
    }
@SuppressWarnings("unchecked")
    public static <T> String unmarshal(Class<T> c, Object o) throws  Exception {

        JAXBContext ctx = JAXBContext.newInstance(c);
        Marshaller marshaller = ctx.createMarshaller();
        StringWriter entityXml = new StringWriter();
        marshaller.marshal(o, entityXml);

        String entityString = entityXml.toString();

        return entityString;
    }

 }

package org.hp.qc.web.restapi.docexamples.docexamples.infrastructure；
导入java.io.StringReader；
导入java.io.StringWriter；
导入javax.xml.bind.Marshaller；
导入javax.xml.bind.JAXBContext；
导入javax.xml.bind.JAXBException；
//导入javax.xml.bind.Marshaller；
导入javax.xml.bind.Unmarshaller；
公共类EntityMarshalingUtils{
私有EntityMarshalingUtils（）{}
@抑制警告（“未选中”）
公共静态T封送处理（c类，字符串xml）抛出JAXBEException{
T res；
如果（c==xml.getClass（））{
res=（T）xml；
}
否则{
JAXBContext ctx=JAXBContext.newInstance（c）；
解组器marshaller=ctx.createUnmarshaller（）；
res=（T）marshaller.unmarshal（新的StringReader（xml））；
}
返回res；
}
@抑制警告（“未选中”）
公共静态字符串解组（类c，对象o）引发异常{
JAXBContext ctx=JAXBContext.newInstance（c）；
Marshaller=ctx.createMarshaller（）；
StringWriter entityXml=新的StringWriter（）；
marshaller.marshall（o，entityXml）；
String entityString=entityXml.toString（）；
返回entityString；
}
}

有人能帮我吗

    String xml = EntityMarshallingUtils.unmarshal(org.eclipse.jetty.server.Response.class,**fields**);
    System.out.println(xml);

package org.hp.qc.web.restapi.docexamples.docexamples.infrastructure;
import java.io.StringReader;
import java.io.StringWriter;
import javax.xml.bind.Marshaller;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
//import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
public class EntityMarshallingUtils {
 private EntityMarshallingUtils() {}
@SuppressWarnings("unchecked")
    public static <T> T marshal(Class<T> c, String xml) throws JAXBException     {
        T res;

        if (c == xml.getClass()) {
            res = (T) xml;
        }

        else {
            JAXBContext ctx = JAXBContext.newInstance(c);
            Unmarshaller marshaller = ctx.createUnmarshaller();
            res = (T) marshaller.unmarshal(new StringReader(xml));
        }

        return res;
    }
@SuppressWarnings("unchecked")
    public static <T> String unmarshal(Class<T> c, Object o) throws  Exception {

        JAXBContext ctx = JAXBContext.newInstance(c);
        Marshaller marshaller = ctx.createMarshaller();
        StringWriter entityXml = new StringWriter();
        marshaller.marshal(o, entityXml);

        String entityString = entityXml.toString();

        return entityString;
    }

 }