Microsoft现在是否支持Java EWS API？出现这种疑问是因为我开始看到＆＃34;档案库已经退役了＃34;在他们的网站上。
我要做的是通过创建带有流式订阅的Java EWS API客户端从Microsoft Outlook服务器获取新邮件。
我的java代码在行NullPointerException上抛出conn.addSubscription(subscription);（下面提到的代码）。
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");
}
以上代码打印堆栈跟踪：
java.lang.NullPointerException at 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.ServiceValidationException at 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)
答案 0 :(得分：1)
您需要为初学者加载Strings.properties文件（应该在下载的API的基本目录中）。没有它，它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。将它放在资源文件夹中（或者你喜欢的任何地方），然后在Strings.java类中加载它。实际上有一堆注释掉的代码就是这样做的。加载它，你应该至少能够得到破坏你的流式订阅的实际错误。或者，附加跟踪侦听器并打印响应的XML，以便您可以深入了解并找到错误消息。
啊，你改变了一点。微软还没有更新EWS Java 1.2大约一年半。该项目本身已移至新页面，因此它仍然可用：http://code.msdn.microsoft.com/Exchange-EWS-Java-API-12-1a5a1143
他们在Apache 2.0许可证下暂时使用了它，但显然这是错误的，他们又恢复了旧许可证。我不认为微软曾“支持”EWS Java。 1.2的许可证明确表示它是“原样”产品，并且他们不支持它。
我非常希望MS在开源许可证下提供它，或者至少修复一些错误，给它一个合适的存储库等等。如果有的话，我会有一个充满错误修正的桶。在此之前（如果有的话），假设它仍然不受支持。对它的唯一支持是Technet，SO等，以及你自己。