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java.lang.NullPointerException: 	at org.icefaces.impl.context.DOMPartialRenderCallback.visit(DOMPartialViewContext.java:790)	at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)	at org.icefaces.ace.component.datatable.DataTable.visitTree(DataTable.java:1606)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIForm.visitTree(UIForm.java:371)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at javax.faces.component.UIComponent.visitTree(UIComponent.java:1623)	at org.icefaces.impl.context.DOMPartialViewContext.renderSubtrees(DOMPartialViewContext.java:463)	at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:171)	at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:973)	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1779)	at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:390)	at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)	at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:286)	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)	at java.lang.Thread.run(Thread.java:744)