解析 Web 服务响应时出现问题 (Metro/JAXB)

Question

我之前已经从 WSDL 生成了 Metro/JAXB 客户端，并且 Java 类与 SOAP/XML 之间的编组/解组工作没有任何问题。我生成了一个新客户端，似乎存在解组问题，我不确定为什么。 WSDL 非常大（> 27,000 行），我不得不使用 -B-XautoNameResolution，因为某些元素名称除了大小写外都是相同的。

我正在尝试执行此方法/操作：

@WebService(name = "servicePortType", targetNamespace = "urn:service")
@XmlSeeAlso({
    ObjectFactory.class
})
public interface ServicePortType {


    /**
     * Service definition of function unsp__GetSubscriberList
     * 
     * @param result
     * @param totalSubsFound
     * @param getSubListReq
     * @param paginatedInfo
     * @param getSubscriberListData
     */
    @WebMethod(operationName = "GetSubscriberList")
    @RequestWrapper(localName = "GetSubscriberList", targetNamespace = "urn:service", className = "service.GetSubscriberList")
    @ResponseWrapper(localName = "GetSubscriberListResult", targetNamespace = "urn:service", className = "service.GetSubscriberListResult")
    public void getSubscriberList(
        @WebParam(name = "GetSubListReq", targetNamespace = "")
        GetSubscriberListRequest getSubListReq,
        @WebParam(name = "Result", targetNamespace = "", mode = WebParam.Mode.OUT)
        Holder<ResultCodeStruct> result,
        @WebParam(name = "PaginatedInfo", targetNamespace = "", mode = WebParam.Mode.OUT)
        Holder<PaginatedInfo> paginatedInfo,
        @WebParam(name = "TotalSubsFound", targetNamespace = "", mode = WebParam.Mode.OUT)
        Holder<Integer> totalSubsFound,
        @WebParam(name = "GetSubscriberListData", targetNamespace = "", mode = WebParam.Mode.OUT)
        Holder<GetSubscriberListData> getSubscriberListData);

}

此方法将返回订阅者数据以及订阅者总数。我的调用如下所示：

public int getTotalSubscriptions()
        throws Exception
{
    GetSubscriberListRequest subscriberListRequest = factory.createGetSubscriberListRequest();
    Holder<ResultCodeStruct> result = null;
    Holder<PaginatedInfo> paginatedInfo = null;
    Holder<Integer> totalSubsFound = null;
    Holder<GetSubscriberListData> subscriberListData = null;

    subscriberListRequest.setMaxSubscribers(factory.createGetSubscriberListRequestMaxSubscribers(1));

    port.getSubscriberList(subscriberListRequest,
            result,
            paginatedInfo,
            totalSubsFound,
            subscriberListData);

    if (result.value.getResultCode() != CODE_SUCCESS)
    {
        throw new Exception("Failed call");
    }

    return totalSubsFound.value.intValue();
}

我在结果对象上收到 NullPointerException。我已经跟踪了 SOAP 调用，并且返回的 XML 符合预期，包括 Result 元素。

我以前从未遇到过WebParam.Mode.OUT。持有者是否应该？在调用之前初始化实例吗？为了什么？

这些元素包装在 SOAP 中的 GetSubscriberListResult 元素中，但由于接口方法在 @ResponseWrapper 中定义了该元素，因此我希望将它们解组到传入的对象中。也许我需要做其他事情？

非常感谢任何建议/帮助！

Answer 1

花了相当多的时间在互联网上搜索，发现一个较旧的参考文献指出 Holder 对象确实需要初始化。因此，更正后的方法调用如下所示：

public int getTotalSubscriptions()
        throws Exception
{
        GetSubscriberListRequest subscriberListRequest = factory.createGetSubscriberListRequest();
        Holder<ResultCodeStruct> result = new Holder<ResultCodeStruct>(factory.createResultCodeStruct());
        Holder<PaginatedInfo> paginatedInfo = new Holder<PaginatedInfo>(factory.createPaginatedInfo());
        Holder<Integer> totalSubsFound = new Holder<Integer>(new Integer(0));
        Holder<GetSubscriberListData> subscriberListData = new Holder<GetSubscriberListData>(factory.createGetSubscriberListData());

    subscriberListRequest.setMaxSubscribers(factory.createGetSubscriberListRequestMaxSubscribers(1));

    port.getSubscriberList(subscriberListRequest,
            result,
            paginatedInfo,
            totalSubsFound,
            subscriberListData);

    if (result.value.getResultCode() != CODE_SUCCESS)
    {
        throw new Exception("Failed call");
    }

    return totalSubsFound.value.intValue();
}

希望这可以帮助可能遇到相同问题的其他人。