java.util.ConcurrentModificationException: This exception has no message.

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java.util.ConcurrentModificationException:
at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
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.(WebManager.java:251)
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 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)

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