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java.lang.NullPointerException: 	at org.zkoss.zk.ui.event.Events.postEvent(Events.java:415)	at org.zkoss.zk.ui.event.Events.postEvent(Events.java:466)	at org.zkoss.zk.ui.event.Events.postEvent(Events.java:397)	at org.zkoss.zkmax.zul.Chosenbox.postOnInitRender(Chosenbox.java:830)	at org.zkoss.zkmax.zul.Chosenbox.readObject(Chosenbox.java:914)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractComponent.readObject(AbstractComponent.java:3503)	at sun.reflect.GeneratedMethodAccessor39.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.AbstractPage.readObject(AbstractPage.java:257)	at sun.reflect.GeneratedMethodAccessor44.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at java.util.LinkedList.readObject(LinkedList.java:1149)	at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)	at org.zkoss.zk.ui.impl.DesktopImpl.readObject(DesktopImpl.java:1150)	at sun.reflect.GeneratedMethodAccessor55.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at java.util.HashMap.readObject(HashMap.java:1396)	at sun.reflect.GeneratedMethodAccessor40.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:501)	at org.zkoss.util.CacheMap.readObject(CacheMap.java:637)	at sun.reflect.GeneratedMethodAccessor54.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1993)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1918)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.zkoss.zk.ui.http.SimpleSession.readThis(SimpleSession.java:480)	at org.zkoss.zk.ui.http.SerializableSession.readObject(SerializableSession.java:76)	at sun.reflect.GeneratedMethodAccessor53.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1896)	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1801)	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1351)	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)	at org.apache.catalina.ha.session.DeltaRequest$AttributeInfo.readExternal(DeltaRequest.java:387)	at org.apache.catalina.ha.session.DeltaRequest.readExternal(DeltaRequest.java:277)	at org.apache.catalina.ha.session.DeltaManager.deserializeDeltaRequest(DeltaManager.java:565)	at org.apache.catalina.ha.session.DeltaManager.handleSESSION_DELTA(DeltaManager.java:1233)	at org.apache.catalina.ha.session.DeltaManager.messageReceived(DeltaManager.java:1177)	at org.apache.catalina.ha.session.DeltaManager.messageDataReceived(DeltaManager.java:916)	at org.apache.catalina.ha.session.ClusterSessionListener.messageReceived(ClusterSessionListener.java:77)	at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:789)	at org.apache.catalina.ha.tcp.SimpleTcpCluster.messageReceived(SimpleTcpCluster.java:770)	at org.apache.catalina.tribes.group.GroupChannel.messageReceived(GroupChannel.java:301)	at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)	at org.apache.catalina.tribes.group.interceptors.TcpPingInterceptor.messageReceived(TcpPingInterceptor.java:178)	at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)	at org.apache.catalina.tribes.group.interceptors.TcpFailureDetector.messageReceived(TcpFailureDetector.java:117)	at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)	at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)	at org.apache.catalina.tribes.group.interceptors.StaticMembershipInterceptor.messageReceived(StaticMembershipInterceptor.java:96)	at org.apache.catalina.tribes.group.ChannelInterceptorBase.messageReceived(ChannelInterceptorBase.java:83)	at org.apache.catalina.tribes.group.ChannelCoordinator.messageReceived(ChannelCoordinator.java:284)	at org.apache.catalina.tribes.transport.ReceiverBase.messageDataReceived(ReceiverBase.java:246)	at org.apache.catalina.tribes.transport.nio.NioReplicationTask.drainChannel(NioReplicationTask.java:211)	at org.apache.catalina.tribes.transport.nio.NioReplicationTask.run(NioReplicationTask.java:102)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)