Getting this error: java.io.FileOutputStream is a restricted class. Please see the Google App Engine developer's guide for more details.

[Mariano]

I'm using this guide:

https://code.google.com/p/gwtupload/wiki/GwtUpload_GettingStarted

After I select any file a popup message appear with that text.

In development mode I see this text:

onSubmitComplete: <?xml version="1.0" encoding="UTF-8"?>

<response><error>

Error, probably your project is configured to use Google Application Engine.

Please check your web.xml and use the appropriate GwtUpload servlet.

Server error is:

java.io.FileOutputStream is a restricted class. Please see the Google  App Engine developer's guide for more details.  </error></response>

Any help? Thanks!  And excuse my english.

[Mariano]

Well I solved this problema using gwtupload-gae. and changing the web.xml file. But now after I select any file y got nullJavaException.

In this line:

    at gwtupload.client.Uploader$9.onSubmitComplete(Uploader.java:403)

Event has no HTML result so that is the error. I'm using IE10.

18:13:55.243 [ERROR] [billingweb] onSubmitComplete exception parsing response: 

java.lang.NullPointerException: null

    at com.google.gwt.xml.client.impl.DOMParseException.summarize(DOMParseException.java:31)

    at com.google.gwt.xml.client.impl.DOMParseException.<init>(DOMParseException.java:46)

    at com.google.gwt.xml.client.impl.XMLParserImpl.parse(XMLParserImpl.java:280)

    at com.google.gwt.xml.client.XMLParser.parse(XMLParser.java:47)

    at gwtupload.client.Uploader$9.onSubmitComplete(Uploader.java:403)

    at com.google.gwt.user.client.ui.FormPanel$SubmitCompleteEvent.dispatch(FormPanel.java:117)

    at com.google.gwt.user.client.ui.FormPanel$SubmitCompleteEvent.dispatch(FormPanel.java:1)

    at com.google.gwt.event.shared.GwtEvent.dispatch(GwtEvent.java:1)

    at com.google.web.bindery.event.shared.EventBus.dispatchEvent(EventBus.java:40)

    at com.google.web.bindery.event.shared.SimpleEventBus.doFire(SimpleEventBus.java:193)

    at com.google.web.bindery.event.shared.SimpleEventBus.fireEvent(SimpleEventBus.java:88)

    at com.google.gwt.event.shared.HandlerManager.fireEvent(HandlerManager.java:127)

    at com.google.gwt.user.client.ui.Widget.fireEvent(Widget.java:129)

    at com.google.gwt.user.client.ui.FormPanel$1.execute(FormPanel.java:649)

    at com.google.gwt.core.client.impl.SchedulerImpl$Task$.executeScheduled$(SchedulerImpl.java:50)

    at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:180)

    at com.google.gwt.core.client.impl.SchedulerImpl.flushPostEventPumpCommands(SchedulerImpl.java:345)

    at com.google.gwt.core.client.impl.SchedulerImpl$Flusher.execute(SchedulerImpl.java:78)

    at com.google.gwt.core.client.impl.SchedulerImpl.execute(SchedulerImpl.java:138)

    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)

    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:338)

    at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219)

    at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)

    at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:576)

    at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:284)

    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:347)

    at sun.reflect.GeneratedMethodAccessor36.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)

    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:293)

    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547)

    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)

    at java.lang.Thread.run(Unknown Source)

[Mariano]

Uggg I found this:

http://stackoverflow.com/questions/950949/gwt-how-to-get-a-submission-result-out-of-formpanel

> This is the correct answer. In Dev Mode event.getResult() is always null 

I will test this and update later. Thanks!

[Hoang Trung]

Hi, did you solve this problem? please help me.