java - 为什么流订阅在 Java EWS API 中不起作用？

Question

Microsoft 现在支持 Java EWS API 吗？出现这个疑问是因为我开始在他们的网站上看到“文件馆已退役”。

我想做的是通过创建具有流订阅的 Java EWS API 客户端来从 Microsoft Outlook 服务器获取新邮件。

我的java代码在conn.addSubscription(subscription);行抛出一个NullPointerException(代码如下)。

提前致谢。

public class StreamSub implements INotificationEventDelegate, ISubscriptionErrorDelegate{
public static ExchangeService service;
public StreamSub() throws Exception {
    service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
    ExchangeCredentials credential = new WebCredentials("myemail","my password");
    service.setCredentials(credential);
    service.autodiscoverUrl("myemail");
    this.rep();
}
public void rep() throws Exception
{
    WellKnownFolderName sd = WellKnownFolderName.Calendar;
    FolderId folderid = new FolderId(sd);
    List<FolderId> folder = new ArrayList<FolderId>();
    folder.add(folderid);
    StreamingSubscription subscription = service.subscribeToStreamingNotifications(folder, EventType.Created, EventType.Deleted, EventType.Modified, EventType.Status);
    StreamingSubscriptionConnection conn = new StreamingSubscriptionConnection(service,30);
            conn.addSubscription(subscription);
            conn.addOnNotificationEvent(this);
            conn.addOnDisconnect(this);
    conn.open();
    //EmailMessage msg = new EmailMessage(service);
    //msg.setSubject("test");
    //msg.getToRecipients().add("my e-mail");
    //msg.send();
    //Thread.sleep(20000);
    conn.close();
    System.out.println("close");
}

上面的代码打印堆栈跟踪:

java.lang.NullPointerExceptionat microsoft.exchange.webservices.data.Strings.(Strings.java:223)at microsoft.exchange.webservices.data.SubscribeRequest.validate(SubscribeRequest.java:50)at microsoft.exchange.webservices.data.SubscribeToStreamingNotificationsRequest.validate(SubscribeToStreamingNotificationsRequest.java:32)at microsoft.exchange.webservices.data.ServiceRequestBase.validateAndEmitRequest(ServiceRequestBase.java:822)at microsoft.exchange.webservices.data.SimpleServiceRequestBase.internalExecute(SimpleServiceRequestBase.java:46)at microsoft.exchange.webservices.data.MultiResponseServiceRequest.execute(MultiResponseServiceRequest.java:144)at microsoft.exchange.webservices.data.ExchangeService.subscribeToStreamingNotifications(ExchangeService.java:2438)at StreamSub.rep(StreamSub.java:21)at StreamSub.(StreamSub.java:13)at GUIS$3.actionPerformed(GUIS.java:81)at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)at java.awt.Component.processMouseEvent(Component.java:6505)at javax.swing.JComponent.processMouseEvent(JComponent.java:3311)at java.awt.Component.processEvent(Component.java:6270)at java.awt.Container.processEvent(Container.java:2229)at java.awt.Component.dispatchEventImpl(Component.java:4861)at java.awt.Container.dispatchEventImpl(Container.java:2287)at java.awt.Component.dispatchEvent(Component.java:4687)at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)at java.awt.Container.dispatchEventImpl(Container.java:2273)at java.awt.Window.dispatchEventImpl(Window.java:2719)at java.awt.Component.dispatchEvent(Component.java:4687)at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)at java.awt.EventQueue.access$200(EventQueue.java:103)at java.awt.EventQueue$3.run(EventQueue.java:694)at java.awt.EventQueue$3.run(EventQueue.java:692)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)at java.awt.EventQueue$4.run(EventQueue.java:708)at java.awt.EventQueue$4.run(EventQueue.java:706)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)microsoft.exchange.webservices.data.ServiceValidationExceptionat microsoft.exchange.webservices.data.SubscribeRequest.validate(SubscribeRequest.java:49)at microsoft.exchange.webservices.data.SubscribeToStreamingNotificationsRequest.validate(SubscribeToStreamingNotificationsRequest.java:32)at microsoft.exchange.webservices.data.ServiceRequestBase.validateAndEmitRequest(ServiceRequestBase.java:822)at microsoft.exchange.webservices.data.SimpleServiceRequestBase.internalExecute(SimpleServiceRequestBase.java:46)at microsoft.exchange.webservices.data.MultiResponseServiceRequest.execute(MultiResponseServiceRequest.java:144)at microsoft.exchange.webservices.data.ExchangeService.subscribeToStreamingNotifications(ExchangeService.java:2438)at StreamSub.rep(StreamSub.java:21)at StreamSub.(StreamSub.java:13)at GUIS$3.actionPerformed(GUIS.java:81)at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)at java.awt.Component.processMouseEvent(Component.java:6505)at javax.swing.JComponent.processMouseEvent(JComponent.java:3311)at java.awt.Component.processEvent(Component.java:6270)at java.awt.Container.processEvent(Container.java:2229)at java.awt.Component.dispatchEventImpl(Component.java:4861)at java.awt.Container.dispatchEventImpl(Container.java:2287)at java.awt.Component.dispatchEvent(Component.java:4687)at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)at java.awt.Container.dispatchEventImpl(Container.java:2273)at java.awt.Window.dispatchEventImpl(Window.java:2719)at java.awt.Component.dispatchEvent(Component.java:4687)at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:735)at java.awt.EventQueue.access$200(EventQueue.java:103)at java.awt.EventQueue$3.run(EventQueue.java:694)at java.awt.EventQueue$3.run(EventQueue.java:692)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)at java.awt.EventQueue$4.run(EventQueue.java:708)at java.awt.EventQueue$4.run(EventQueue.java:706)at java.security.AccessController.doPrivileged(Native Method)at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)at java.awt.EventQueue.dispatchEvent(EventQueue.java:705)at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Answer 1

对于初学者，您需要加载 Strings.properties 文件(应位于下载的 API 的基本目录中)。如果没有它，它就无法找到错误消息并抛出您看到的异常。有点讽刺的是，它在处理错误时抛出错误。将其放在资源文件夹中(或者任何您喜欢的地方)，然后将其加载到 Strings.java 类中。实际上有一堆注释掉的代码就是这样做的。加载它，您至少应该能够获得破坏流媒体订阅的实际错误。或者，附加跟踪监听器并打印响应的 XML，以便您可以深入研究并找到错误消息。

啊，你改变了一些事情。 Microsoft 大约有一年半没有更新 EWS Java 1.2。该项目本身已移至新页面，因此仍然可用:

http://code.msdn.microsoft.com/Exchange-EWS-Java-API-12-1a5a1143

他们曾短暂地使用 Apache 2.0 许可证，但显然这是错误的，他们恢复了旧许可证。我认为 Microsoft 从未“支持”过 EWS Java。 1.2 的许可证明确表示它是“按原样”产品并且他们不支持它。

我非常希望微软能够在开源许可证下提供它，或者至少修复一些错误，给它一个适当的存储库，等等。如果他们这样做的话，我将有一个装满错误修复的桶来提交。直到这种情况发生(如果有的话)，假设它仍然不受支持。唯一支持它的是 Technet、SO 等，还有你自己。