使用 RequestFactory 和 Objectify 时出现奇怪的异常

Question

我查看了 Google IO gwtgae2011 中的示例并使其正常工作。我尝试向项目添加一些功能，但不断从服务器收到异常（调用了 onFailure 方法），堆栈跟踪是

19:47:36.070 [ERROR] [crowd] Uncaught exception escaped
com.google.web.bindery.event.shared.UmbrellaException: One or more exceptions caught, see full set in UmbrellaException#getCauses
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$StandardPayloadDialect.processPayload(AbstractRequestContext.java:299)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$4.onTransportSuccess(AbstractRequestContext.java:951)
at com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport$1.onResponseReceived(DefaultRequestTransport.java:136)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
......stacktrace

Caused by: java.lang.RuntimeException: Server Error: No class 'com.trial.gwtgae.server.domain.Sketch2' was registered
at com.google.web.bindery.requestfactory.shared.Receiver.onFailure(Receiver.java:36)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequest.onFail(AbstractRequest.java:113)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$StandardPayloadDialect.processPayload(AbstractRequestContext.java:271)
at com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext$4.onTransportSuccess(AbstractRequestContext.java:951)
at com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport$1.onResponseReceived(DefaultRequestTransport.java:136)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
...more stacktrace

我创建了名为 Sketch2 的 Sketch 类的精确克隆，并在 RequestFactory 接口中创建了 SketchDao、SketchProxy 和 SqetchRequest 的克隆。

无论如何都会抛出异常。 （我尝试重新编译、重新启动、清理生成的文件，尝试使用 IDEA - 同样的问题） 有什么想法为什么会发生这种情况吗？

Answer 1

您必须注册要与 objectify 一起使用的类。像这样的东西：

factory.register(com.trial.gwtgae.server.domain.Sketch2.class);