尝试使用 Jersey 将 JSON 转换为 POJO 时出错

我正在这样做：

WebResource resource = client.resource(urlStr); 
resource.accept(MediaType.APPLICATION_JSON_TYPE, MediaType.APPLICATION_XML_TYPE);
GenericType<List<EMailInformations>> genericType = new GenericType<List<EMailInformations>>() {};
List<EMailInformations> response = null; 
try{ 
    response = resource.get(genericType); 
} catch (UniformInterfaceException ue) { 
    ClientResponse clientResponse = ue.getResponse(); 
}

类 EMailInformation

@XmlRootElement
public class EMailInformations {
    private long id;

    public EMailInformations(){

    }

    public EMailInformations(long id) {
        super();
        this.id = id;
    }
        //getters & setters ...
}

一些 JSON 响应

{"cn":[{"id":"302","l":"7","d":1308239209000,"rev":14667,"fileAsStr":"TAICHIMARO, Marouane","_attrs":{"lastName":"TAICHIMARO","imAddress1":"other:......

我收到这个错误：

21 juin 2011 16:56:01 com.sun.jersey.api.client.ClientResponse getEntity
GRAVE: A message body reader for Java class java.util.List, and Java type java.util.List<fr.liberacces.pool.liferay.connecteur.modele.EMailInformations>, and MIME media type text/plain was not found
21 juin 2011 16:56:01 com.sun.jersey.api.client.ClientResponse getEntity
GRAVE: The registered message body readers compatible with the MIME media type are:
text/plain ->
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
*/* ->
  com.sun.jersey.core.impl.provider.entity.FormProvider
  com.sun.jersey.core.impl.provider.entity.StringProvider
  com.sun.jersey.core.impl.provider.entity.ByteArrayProvider
  com.sun.jersey.core.impl.provider.entity.FileProvider
  com.sun.jersey.core.impl.provider.entity.InputStreamProvider
  com.sun.jersey.core.impl.provider.entity.DataSourceProvider
  com.sun.jersey.core.impl.provider.entity.XMLJAXBElementProvider$General
  com.sun.jersey.core.impl.provider.entity.ReaderProvider
  com.sun.jersey.core.impl.provider.entity.DocumentProvider
  com.sun.jersey.core.impl.provider.entity.SourceProvider$StreamSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$SAXSourceReader
  com.sun.jersey.core.impl.provider.entity.SourceProvider$DOMSourceReader
  com.sun.jersey.json.impl.provider.entity.JSONJAXBElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONArrayProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONObjectProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLListElementProvider$General
  com.sun.jersey.core.impl.provider.entity.XMLRootObjectProvider$General
  com.sun.jersey.core.impl.provider.entity.EntityHolderReader
  com.sun.jersey.json.impl.provider.entity.JSONRootElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JSONListElementProvider$General
  com.sun.jersey.json.impl.provider.entity.JacksonProviderProxy

但我收到此错误： GRAVE: A message body reader for Java class java.util.List, and Java type ... was not found

这是萤火虫跟踪：

Réponsevoir le code source
Date    Wed, 22 Jun 2011 10:36:19 GMT
Content-Encoding    gzip
Content-Length  634
Via 1.1 zimbra.server.com
Keep-Alive  timeout=15, max=100
Connection  Keep-Alive
Content-Type    text/plain
Requêtevoir le code source
Host    zimbra.server.com
User-Agent  Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0.1) Gecko/20100101 Firefox/4.0.1
Accept  text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language fr,fr-fr;q=0.8,en-us;q=0.5,en;q=0.3
Accept-Encoding gzip, deflate
Accept-Charset  ISO-8859-1,utf-8;q=0.7,*;q=0.7
Keep-Alive  115
Connection  keep-alive
Cookie  ZM_AUTH_TOKEN=0_01e07d9cb12b86ef4675604362137c08c1d9fd0d_69643d33363a61343831353331382d336436362d343766632d386662393d3133613638633661323165393b6578703d31333a313330383832313935333436393b747970653d363a7a696d6172613b; JSESSIONID=1eb0ksxao39jj

我遇到了同样的问题。通过使用“yves amsellem”的提示，我可以得到更进一步的帮助。 对我来说，我可以使用 POJO 映射器功能来解决这个问题。 （它们需要在服务器和客户端上启用。此外，需要 jersey-json 库才能使其正常工作）

ClientConfig config = new DefaultClientConfig();
..
config.getFeatures().put(JSONConfiguration.FEATURE_POJO_MAPPING, Boolean.TRUE);
..
Client client = Client.create(config);

我希望这可以帮助您进一步前进，尽管这个问题已经很老了。