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java.lang.IllegalArgumentException: Unknown operation com.client.managed.request.WorldRequest::persist	at com.google.gwt.requestfactory.server.JsonRequestProcessor.getOperation(JsonRequestProcessor.java:715)	at com.google.gwt.requestfactory.server.JsonRequestProcessor.processJsonRequest(JsonRequestProcessor.java:856)	at com.google.gwt.requestfactory.server.JsonRequestProcessor.decodeAndInvokeRequest(JsonRequestProcessor.java:243)	at com.google.gwt.requestfactory.server.JsonRequestProcessor.decodeAndInvokeRequest(JsonRequestProcessor.java:63)	at com.google.gwt.requestfactory.server.RequestFactoryServlet.doPost(RequestFactoryServlet.java:116)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)	at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:77)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)	at org.springframework.orm.jpa.support.OpenEntityManagerInViewFilter.doFilterInternal(OpenEntityManagerInViewFilter.java:113)	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)	at org.mortbay.jetty.servlet.ServletHandler$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)