Just saw this error myself as well, slightly different message:

Unexpected error: java.lang.RuntimeException: Could not parse payload: 
payload[0] = I

using GWT 2.5 and no GAE. Stacktrace is exactly the same though. Don't know 
why or what it means, just that I get it so far when a specific request is 
made. Has anybody found out what this means?

On Monday, January 14, 2013 11:17:27 AM UTC-5, Nick Siderakis wrote:
>
> Hey Sydney, I've been seeing the same error message recently. Did you 
> figure it out?
>
>
> On Saturday, July 28, 2012 3:46:00 PM UTC-4, Sydney wrote:
>>
>> After deploying my app on appengine, I get the following exception: 
>>
>> com.google.web.bindery.requestfactory.server.RequestFactoryServlet doPost: 
>> Unexpected error
>> java.lang.RuntimeException: Could not parse payload: payload[0] = N
>>     at 
>> com.google.web.bindery.autobean.vm.impl.JsonSplittable.create(JsonSplittable.java:70)
>>     at 
>> com.google.web.bindery.autobean.shared.impl.StringQuoter.create(StringQuoter.java:46)
>>     at 
>> com.google.web.bindery.autobean.shared.ValueCodex$Type$7.encode(ValueCodex.java:122)
>>     at 
>> com.google.web.bindery.autobean.shared.ValueCodex.encode(ValueCodex.java:315)
>>     at 
>> com.google.web.bindery.autobean.shared.impl.AutoBeanCodexImpl$ValueCoder.extractSplittable(AutoBeanCodexImpl.java:500)
>>     at 
>> com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.setProperty(AbstractAutoBean.java:277)
>>     at 
>> com.google.web.bindery.autobean.vm.impl.ProxyAutoBean.setProperty(ProxyAutoBean.java:253)
>>     at 
>> com.google.web.bindery.autobean.vm.impl.BeanPropertyContext.set(BeanPropertyContext.java:44)
>>     at 
>> com.google.web.bindery.requestfactory.server.Resolver$PropertyResolver.visitValueProperty(Resolver.java:154)
>>     at 
>> com.google.web.bindery.autobean.vm.impl.ProxyAutoBean.traverseProperties(ProxyAutoBean.java:289)
>>     at 
>> com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.traverse(AbstractAutoBean.java:166)
>>     at 
>> com.google.web.bindery.autobean.shared.impl.AbstractAutoBean.accept(AbstractAutoBean.java:101)
>>     at 
>> com.google.web.bindery.requestfactory.server.Resolver.resolveClientValue(Resolver.java:395)
>>     at 
>> com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.processInvocationMessages(SimpleRequestProcessor.java:483)
>>     at 
>> com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:225)
>>     at 
>> com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:127)
>>     at 
>> com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
>>     at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
>>
>> Any idea of what the exception means? Thanks
>>
>

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