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POUpdating App Engine GWT web app - the correct way?
 

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  1. POUpdating App Engine GWT web app - the correct way?
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    <p>I have a website, completely written in GWT, using App Engine, and whenever I update the codebase I want users to use the latest version of my compiled GWT code. Problem is, users often see exceptions like the one below, until they refresh their page. </p> <p>Am I handling updates in the right way:</p> <ul> <li>I update the version field in appengine-web.xml, deploy it, then make it active in App Engine.</li> <li>However, I found that sometimes users' browsers still end up using an old version</li> <li>To fix this, the first request I do to my server is to check a VERSION string, and if it is wrong then I manually do a Window.Location.reload()</li> <li>This works (most of the time)</li> <li>Problem is that sometimes on load I get exceptions like those shown at the bottom of this question. When I refresh the page, everything works fine.</li> </ul> <p>Main problem is that I have no way to reproduce it, and none of the code in the stack trace is mine.</p> <p>Any suggestions on how to:</p> <ul> <li>reproduce it?</li> <li>debug it?</li> <li>prevent it?</li> <li>update my web app in the correct way?</li> </ul> <p>Stack trace:</p> <pre><code>com.google.gwt.event.shared.UmbrellaException: 3 exceptions caught: (Error) : Permission denied to access property 'target'; (Error) : Permission denied to access property 'target'; (Error) : Permission denied to access property 'target' 3 exceptions caught: (Error) : Permission denied to access property 'target'; (Error) : Permission denied to access property 'target'; (Error) : Permission denied to access property 'target' at com.google.gwt.core.client.impl.StackTraceCreator$CollectorEmulated.$fillInStackTrace(StackTraceCreator.java:174) at java.lang.RuntimeException.RuntimeException(RuntimeException.java:508) at com.google.web.bindery.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:71) at com.google.gwt.event.shared.UmbrellaException.UmbrellaException(UmbrellaException.java:26) at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:90) at com.google.gwt.user.client.Event$NativePreviewEvent.fire(Event.java:87) at com.google.gwt.user.client.DOM.previewEvent(DOM.java:1328) at Unknown.anonymous(DOMImplStandard.java:152) at com.google.gwt.core.client.impl.Impl.apply(Impl.java:189) at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242) at Unknown.anonymous(Impl.java:70) at Unknown.anonymous(DOMImplStandard.java:187) at com.google.gwt.core.client.impl.Impl.apply(Impl.java:189) at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:242) at Unknown.anonymous(Impl.java:70) Caused by: com.google.gwt.core.client.JavaScriptException: (Error) : Permission denied to access property 'target' (Error) : Permission denied to access property 'target' at com.google.gwt.core.client.impl.StackTraceCreator$CollectorEmulated.$fillInStackTrace(StackTraceCreator.java:174) at com.google.gwt.core.client.JavaScriptException.JavaScriptException(JavaScriptException.java:508) at com.google.gwt.lang.Exceptions.caught(Exceptions.java:29) at com.google.gwt.user.client.ui.PopupPanel.$eventTargetsPopup(PopupPanel.java:1167) at com.google.gwt.user.client.ui.PopupPanel.$previewNativeEvent(PopupPanel.java:1340) at com.google.gwt.user.client.ui.PopupPanel$3.onPreviewNativeEvent(PopupPanel.java:1435) at com.google.gwt.user.client.Event$NativePreviewEvent.dispatch(Event.java:194) at com.google.web.bindery.event.shared.SimpleEventBus.$doFire(SimpleEventBus.java:194) at com.google.gwt.event.shared.HandlerManager.$fireEvent(HandlerManager.java:127) ... 10 more </code></pre>
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