JAX-RS球衣XML <-> java.util.List

Question

我尝试访问一个JAX-RS Web服务，该服务以XML返回值的java.util.list，但在客户端出现javax.xml.bind.UnmarshalException ...

Web服务方法：

@GET
@Path("/getMessdaten")
@Produces(MediaType.APPLICATION_XML)
public List<MessdatenPCommon> getMessdatenValues() throws Exception {
    List<MessdatenPCommon> messdatenPList = testBean();
    return MessdatenPCommonList;}

客户端中的访问代码：

List<MessdatenPCommon> m = webResource.path("test").path("helloworld/getMessdaten").accept(MediaType.APPLICATION_XML).et(new GenericType<List<MessdatenPCommon>>() {});

客户端异常：

Exception in thread "main" javax.ws.rs.WebApplicationException: javax.xml.bind.UnmarshalException
 - with linked exception:
[com.sun.istack.internal.SAXParseException2; lineNumber: 1; columnNumber: 89; Unable to create an instance of xx.xxxx.xxx.xxx.xxxxx.xxxx.MessdatenPCommon]
    at com.sun.jersey.core.provider.jaxb.AbstractListElementProvider.readFrom(AbstractListElementProvider.java:251)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:553)
    at com.sun.jersey.api.client.ClientResponse.getEntity(ClientResponse.java:523)
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:686)
    at com.sun.jersey.api.client.WebResource.access$300(WebResource.java:74)
    at com.sun.jersey.api.client.WebResource$Builder.get(WebResource.java:508)
    at appclient.TestClient.main(TestClient.java:31)
Caused by: javax.xml.bind.UnmarshalException
 - with linked exception:
[com.sun.istack.internal.SAXParseException2; lineNumber: 1; columnNumber: 89; Unable to create an instance of xx.xxxxx.xxx.xxx.xxxxx.xxxxx.MessdatenPCommon]
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.handleStreamException(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(Unknown Source)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(Unknown Source)
    at com.sun.jersey.core.provider.jaxb.AbstractListElementProvider.readFrom(AbstractListElementProvider.java:234)
    ... 6 more
Caused by: com.sun.istack.internal.SAXParseException2; lineNumber: 1; columnNumber: 89; Unable to create an instance of xx.xxxx.xxx.xxx.xxxx.xxxx.MessdatenPCommon
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.handleEvent(Unknown Source)
....

MessdatenPCommon类：

@XmlSeeAlso({ MessdatenPv.class })
@XmlType
public abstract class MessdatenPCommon extends xx.xxxx.xxx.xxx.AbstractEntityBase {
    private static final long serialVersionUID = 1L;

    public abstract BigDecimal getNum();

    public abstract ...

}

谁能帮我吗？

谢谢！

Answer 1

我假设您期望接收到MessdatenPv的子类MessdatenPCommon ？ 这是因为MessdatenPCommon是抽象的，而MessdatenPv是@XmlSeeAlso批注中的@XmlSeeAlso 。 您将需要确保XML包含必要的xsi:type属性以指示子类型。

您可以封送数据，以查看对封送的期望。