Chrome has been known to randomly throw those exceptions. That is
assuming you are running chrome. See:
http://code.google.com/p/google-web-toolkit/issues/detail?id=5778#c65,
it might be related to the issue you are experiencing.

Best regards,

Alfredo

On Sat, Aug 4, 2012 at 4:41 AM, Richard <[email protected]> wrote:
> Every so often, while running in Dev Mode, I'll get this exception (or
> something like it). Is this some under the hood local-only issue I don't
> need to worry about, or does it hint as something I should fix?  Is there
> anything I can do about it?
>
> Uncaught exception escaped
> com.google.gwt.dev.shell.HostedModeException: Something other than an int
> was returned from JSNI method
> '@com.google.gwt.query.client.js.JsCache::length()': JS value of type
> boolean, expected int
>     at
> com.google.gwt.dev.shell.JsValueGlue.getIntRange(JsValueGlue.java:266)
>     at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:144)
>     at
> com.google.gwt.dev.shell.ModuleSpace.invokeNativeInt(ModuleSpace.java:247)
>     at
> com.google.gwt.dev.shell.JavaScriptHost.invokeNativeInt(JavaScriptHost.java:75)
>     at com.google.gwt.query.client.js.JsCache$.length$(JsCache.java)
>     at
> com.google.gwt.query.client.js.JsObjectArray$.length$(JsObjectArray.java:52)
>     at
> com.google.gwt.query.client.plugins.events.EventsListener.dispatchEvent(EventsListener.java:372)
>     at
> com.google.gwt.query.client.plugins.events.EventsListener.onBrowserEvent(EventsListener.java:435)
>     at com.google.gwt.user.client.DOM.dispatchEventImpl(DOM.java:1351)
>     at com.google.gwt.user.client.DOM.dispatchEvent(DOM.java:1307)
>     at sun.reflect.GeneratedMethodAccessor65.invoke(Unknown Source)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
>     at
> com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
>     at
> com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
>     at
> com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
>     at
> com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
>     at
> com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
>     at
> com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
>     at
> com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
>     at
> com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
>     at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
>     at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
>     at sun.reflect.GeneratedMethodAccessor60.invoke(Unknown Source)
>     at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
>     at java.lang.reflect.Method.invoke(Method.java:597)
>     at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
>     at
> com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
>     at
> com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
>     at
> com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
>     at
> com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
>     at
> com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
>     at java.lang.Thread.run(Thread.java:662)
>
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-- 
Alfredo Quiroga-Villamil

AOL/Yahoo/Gmail/MSN IM:  lawwton

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