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java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$ValueIterator.next(HashMap.java:822) at org.zkoss.zk.ui.AbstractComponent.didActivate(AbstractComponent.java:2565) at org.zkoss.zk.ui.AbstractComponent.sessionDidActivate(AbstractComponent.java:2521) at org.zkoss.zk.ui.impl.PageImpl.sessionDidActivate(PageImpl.java:1021) at org.zkoss.zk.ui.impl.DesktopImpl.sessDidActivate(DesktopImpl.java:989) at org.zkoss.zk.ui.impl.DesktopImpl.sessionDidActivate(DesktopImpl.java:940) at org.zkoss.zk.ui.impl.SimpleDesktopCache.sessionDidActivate(SimpleDesktopCache.java:163) at org.zkoss.zk.ui.impl.SessionDesktopCacheProvider.sessionDidActivate(SessionDesktopCacheProvider.java:73) at org.zkoss.zk.ui.impl.AbstractWebApp.sessionDidActivate(AbstractWebApp.java:337) at org.zkoss.zk.ui.http.SimpleSession$2.didActivate(SimpleSession.java:506) at org.zkoss.zk.ui.http.WebManager.<init>(WebManager.java:251) at org.zkoss.zk.ui.http.HttpSessionListener23.contextInitialized(HttpSessionListener23.java:140) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4206) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4705) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:799) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:779) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:601) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:943) at org.apache.catalina.startup.HostConfig.deployWARs(HostConfig.java:778) at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:504) at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1317) at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:324) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:142) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1065) at org.apache.catalina.core.StandardHost.start(StandardHost.java:840) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1057) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:463) at org.apache.catalina.core.StandardService.start(StandardService.java:525) at org.apache.catalina.core.StandardServer.start(StandardServer.java:754) at org.apache.catalina.startup.Catalina.start(Catalina.java:595) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:289) at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)