We just ran into the same issue.

SEVERE: 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$7.encode(ValueCodex.java:125)
 at com.google.web.bindery.autobean.shared.ValueCodex.
encode(ValueCodex.java:321)
 at com.google.web.bindery.autobean.shared.impl.
AutoBeanCodexImpl$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:155)
 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:414)
 at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.
processInvocationMessages(SimpleRequestProcessor.java:491)
 at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.
process(SimpleRequestProcessor.java:233)
 at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.
process(SimpleRequestProcessor.java:135)
 at com.google.web.bindery.requestfactory.server.
RequestFactoryServlet.doPost(RequestFactoryServlet.java:133)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:305)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:210)
 at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.
doFilterInternal(OpenSessionInViewFilter.java:198)
 at org.springframework.web.filter.OncePerRequestFilter.
doFilter(OncePerRequestFilter.java:76)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(
ApplicationFilterChain.java:243)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(
ApplicationFilterChain.java:210)
 at org.apache.catalina.core.StandardWrapperValve.invoke(
StandardWrapperValve.java:225)
 at org.apache.catalina.core.StandardContextValve.invoke(
StandardContextValve.java:123)
 at org.apache.catalina.authenticator.AuthenticatorBase.invoke(
AuthenticatorBase.java:472)
 at org.apache.catalina.core.StandardHostValve.invoke(
StandardHostValve.java:168)
 at org.apache.catalina.valves.ErrorReportValve.invoke(
ErrorReportValve.java:98)
 at org.apache.catalina.valves.AccessLogValve.invoke(
AccessLogValve.java:927)
 at org.apache.catalina.core.StandardEngineValve.invoke(
StandardEngineValve.java:118)
 at org.apache.catalina.connector.CoyoteAdapter.service(
CoyoteAdapter.java:407)
 at org.apache.coyote.http11.AbstractHttp11Processor.process(
AbstractHttp11Processor.java:1001)
 at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.
process(AbstractProtocol.java:585)
 at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.
run(JIoEndpoint.java:312)
 at java.util.concurrent.ThreadPoolExecutor$Worker.
runTask(ThreadPoolExecutor.java:886)
 at java.util.concurrent.ThreadPoolExecutor$Worker.run(
ThreadPoolExecutor.java:908)
 at java.lang.Thread.run(Thread.java:662)

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