roo示例gwtNoEntities无法加载

我刚刚尝试了与roo-1.1.0捆绑在一起的gwtNoEntities示例

当使用tomcat:run或jetty:run启动时，我只得到加载框

在GWT托管模式下运行时，我会在客户端报告以下stacktrace，
这似乎是与使用浏览器历史记录设置默认位置相关的错误，该历史记录为空

解决这个问题的正确方法是什么

stacktrace

    00:02:08.323 [ERROR] Unable to load module entry point class com.springsource.foo.client.scaffold.Scaffold (see associated exception for details)
    java.util.NoSuchElementException: null
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:796)
at java.util.HashMap$KeyIterator.next(HashMap.java:828)
at com.springsource.foo.client.scaffold.ScaffoldDesktopApp.init(ScaffoldDesktopApp.java:139) 
at com.springsource.foo.client.scaffold.ScaffoldDesktopApp.run(ScaffoldDesktopApp.java:61)
at com.springsource.foo.client.scaffold.Scaffold.onModuleLoad(Scaffold.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    at java.lang.reflect.Method.invoke(Method.java:597)     at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:396)    at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:183)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:510)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:619)

/* Browser history integration */
ScaffoldPlaceHistoryMapper mapper = GWT.create(ScaffoldPlaceHistoryMapper.class);
mapper.setFactory(placeHistoryFactory);
PlaceHistoryHandler placeHistoryHandler = new PlaceHistoryHandler(mapper);
/* 139 */ ProxyListPlace defaultPlace = getTopPlaces().iterator().next();
placeHistoryHandler.register(placeController, eventBus, defaultPlace);
placeHistoryHandler.handleCurrentHistory();

有问题的生成代码

    00:02:08.323 [ERROR] Unable to load module entry point class com.springsource.foo.client.scaffold.Scaffold (see associated exception for details)
    java.util.NoSuchElementException: null
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:796)
at java.util.HashMap$KeyIterator.next(HashMap.java:828)
at com.springsource.foo.client.scaffold.ScaffoldDesktopApp.init(ScaffoldDesktopApp.java:139) 
at com.springsource.foo.client.scaffold.ScaffoldDesktopApp.run(ScaffoldDesktopApp.java:61)
at com.springsource.foo.client.scaffold.Scaffold.onModuleLoad(Scaffold.java:19)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)    at java.lang.reflect.Method.invoke(Method.java:597)     at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:396)    at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:183)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:510)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:352)
at java.lang.Thread.run(Thread.java:619)

/* Browser history integration */
ScaffoldPlaceHistoryMapper mapper = GWT.create(ScaffoldPlaceHistoryMapper.class);
mapper.setFactory(placeHistoryFactory);
PlaceHistoryHandler placeHistoryHandler = new PlaceHistoryHandler(mapper);
/* 139 */ ProxyListPlace defaultPlace = getTopPlaces().iterator().next();
placeHistoryHandler.register(placeController, eventBus, defaultPlace);
placeHistoryHandler.handleCurrentHistory();

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您可以在下面（第139行）用while条件块替换生成的代码

使用mvn compile重新编译，使用mvn gwt:run重新启动。现在您应该没有错误，但是页面为空

gwtnoenties.roo示例没有数据。您可以尝试其他示例，如expenses.roo。生成的代码应该是正常的

如果有帮助，请记住接受答案

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谢谢。

修复工作正常，但GWT客户端只有在我从mvn GWT:run运行时才会呈现，而不是从mvn tomcat:run或mvn jetty:run运行。我试着使用firefox-3和IE-7。