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java.lang.IllegalStateException: Not in an execution	at org.zkoss.zk.ui.event.impl.EventQueueProviderImpl.lookup(EventQueueProviderImpl.java:43)	at org.zkoss.zkmax.ui.event.impl.EventQueueProviderImpl.lookup(EventQueueProviderImpl.java:58)	at org.zkoss.zk.ui.event.EventQueues.lookup(EventQueues.java:127)	at test.MyComposer$2.cleanup(MyComposer.java:53)	at org.zkoss.zk.ui.impl.DesktopImpl.invokeDesktopCleanups(DesktopImpl.java:1258)	at org.zkoss.zk.ui.impl.SimpleDesktopCache.desktopDestroyed(SimpleDesktopCache.java:115)	at org.zkoss.zk.ui.impl.SimpleDesktopCache.access$0(SimpleDesktopCache.java:112)	at org.zkoss.zk.ui.impl.SimpleDesktopCache$Cache.onExpunge(SimpleDesktopCache.java:218)	at org.zkoss.util.CacheMap.expunge(CacheMap.java:235)	at org.zkoss.util.CacheMap.doExpunge(CacheMap.java:209)	at org.zkoss.util.CacheMap.tryExpunge(CacheMap.java:203)	at org.zkoss.util.CacheMap.get(CacheMap.java:392)	at org.zkoss.zk.ui.impl.SimpleDesktopCache.getDesktop(SimpleDesktopCache.java:77)	at org.zkoss.zk.au.http.AuDynaMediar.service(AuDynaMediar.java:97)	at org.zkoss.zk.au.http.DHtmlUpdateServlet.doGet(DHtmlUpdateServlet.java:457)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:401)	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:766)	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:450)	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)	at org.mortbay.jetty.Server.handle(Server.java:326)	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)	at org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:928)	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:549)	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:212)	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:410)	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)