I've been seeing something similar for ages.  My code isn't anywhere in 
this stack trace.  I have no idea what to do.  I'll report it.

java.lang.IllegalArgumentException: Something other than a Java object was 
returned from JSNI method 
'@com.google.gwt.core.client.impl.Impl::apply(Ljava/lang/Object;Ljava/lang/Object;Ljava/lang/Object;)':
 JS value of type boolean, expected java.lang.Object
        at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:178)
        at 
com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:271)
        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.GeneratedMethodAccessor181.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:619)


Ryan


On Wednesday, April 25, 2012 10:14:04 PM UTC-5, Pradeep B Pillai wrote:
>
>
>
> The following is the other error i get  frequently and this seems like 
> its more related to request factory 
> and I dont know why its happening ..Should I open a bug ? 
>
> I'm using GWT 2.4, browser Chrome 18.0.1025.1065 
>
> One or more exceptions caught, see full set in 
> UmbrellaException#getCauses - 
>  CAUSE java.lang.IllegalArgumentException: Something other than a Java 
> object was returned from JSNI method 
> '@com.google.web.bindery.autobean.gwt.client.impl.ClientPropertyContext 
> $Setter::beanSetter(Lcom/google/web/bindery/autobean/shared/impl/ 
> AbstractAutoBean;Ljava/lang/String;)': JS value of type boolean, 
> expected java.lang.Object 
> java.lang.IllegalArgumentException: Something other than a Java object 
> was returned from JSNI method 
> '@com.google.web.bindery.autobean.gwt.client.impl.ClientPropertyContext 
> $Setter::beanSetter(Lcom/google/web/bindery/autobean/shared/impl/ 
> AbstractAutoBean;Ljava/lang/String;)': JS value of type boolean, 
> expected java.lang.Object 
>  STACKTRACE : 
> com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext 
> $StandardPayloadDialect.processPayload(AbstractRequestContext.java: 
> 387) 
> com.google.web.bindery.requestfactory.shared.impl.AbstractRequestContext 
> $5.onTransportSuccess(AbstractRequestContext.java:1108) 
> com.google.web.bindery.requestfactory.gwt.client.DefaultRequestTransport 
> $1.onResponseReceived(DefaultRequestTransport.java:136) 
> com.citrix.ws.democenter.module.shared.client.requestfactory.DemoCenterRequestTransport
>  
>
> $1.onResponseReceived(DemoCenterRequestTransport.java:84) 
> com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java: 
> 287) 
> com.google.gwt.http.client.RequestBuilder 
> $1.onReadyStateChange(RequestBuilder.java:395) 
> sun.reflect.GeneratedMethodAccessor352.invoke(Unknown Source) 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
>  
>
> 25) 
> java.lang.reflect.Method.invoke(Method.java:597) 
> com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) 
> com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) 
> com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java: 
>
> 172) 
> com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:
>  
>
> 337) 
> com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:
>  
>
> 218) 
> com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java: 
> 136) 
> com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java: 
> 561) 
> com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java: 
> 269) 
> com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:
>  
>
> 91) 
> com.google.gwt.core.client.impl.Impl.apply(Impl.java) 
> com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213) 
> sun.reflect.GeneratedMethodAccessor345.invoke(Unknown Source) 
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:
>  
>
> 25) 
> java.lang.reflect.Method.invoke(Method.java:597) 
> com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) 
> com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) 
> com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java: 
>
> 172) 
> com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:
>  
>
> 292) 
> com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:
>  
>
> 546) 
> com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java: 
>
> 363) 
> java.lang.Thread.run(Thread.java:680) 
>  from 
> sourceClasscom.google.web.bindery.event.shared.UmbrellaExceptionwith 
> exception com.google.web.bindery.event.shared.UmbrellaException: One 
> or more exceptions caught, see full set in UmbrellaException#getCauses

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