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java.lang.ClassCastException: 	at java.lang.Class.cast(Class.java:2990)	at com.google.web.bindery.autobean.vm.impl.BeanPropertyContext.set(BeanPropertyContext.java:44)	at com.google.web.bindery.requestfactory.server.Resolver$1.visitValueProperty(Resolver.java:371)	at com.google.web.bindery.autobean.vm.impl.ProxyAutoBean.traverseProperties(ProxyAutoBean.java:260)	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.resolveClientProxy(Resolver.java:323)	at com.google.web.bindery.requestfactory.server.Resolver.resolveClientValue(Resolver.java:418)	at com.google.web.bindery.requestfactory.server.Resolver.resolveClientValue(Resolver.java:196)	at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.createReturnOperations(SimpleRequestProcessor.java:261)	at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:225)	at com.google.web.bindery.requestfactory.server.SimpleRequestProcessor.process(SimpleRequestProcessor.java:125)	at com.google.web.bindery.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:118)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)	at com.google.inject.servlet.ServletDefinition.doService(ServletDefinition.java:261)	at com.google.inject.servlet.ServletDefinition.service(ServletDefinition.java:175)	at com.google.inject.servlet.ManagedServletPipeline.service(ManagedServletPipeline.java:91)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:62)	at com.google.inject.persist.PersistFilter.doFilter(PersistFilter.java:89)	at com.google.inject.servlet.FilterDefinition.doFilter(FilterDefinition.java:162)	at com.google.inject.servlet.FilterChainInvocation.doFilter(FilterChainInvocation.java:58)	at com.google.inject.servlet.ManagedFilterPipeline.dispatch(ManagedFilterPipeline.java:118)	at com.google.inject.servlet.GuiceFilter.doFilter(GuiceFilter.java:113)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:324)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)