ace:dataTable columns reordering does not work more than once. Trying to re-order columns afterwards, or just clicking on the dataTable column headers results in NullPointerException.
This started failing at Jenkins ICEfaces4 trunk Build # 1109: http://dev.icesoft.com/jenkins/job/ICEfaces%204%20Trunk%20%28Continuous%29/1109/

This is reproducible with showcase > Column Reorder demo, and with the QA test app for ace:dataTable:
http://dev.icesoft.com/svn/repo/qa/trunk/Regression-Icefaces4/Sparkle/Nightly/dataTable
Test page: /columnOrderTest.jsf.

Mar 09, 2015 11:28:34 AM com.sun.faces.lifecycle.UpdateModelValuesPhase execute
WARNING: java.lang.NullPointerException
Mar 09, 2015 11:28:34 AM org.icefaces.impl.context.DOMPartialRenderCallback visit
SEVERE: Subtree rendering failed for class org.icefaces.ace.component.datatable.DataTable form:carTable
java.lang.NullPointerException
    at org.icefaces.ace.util.ComponentUtils.resolveField(ComponentUtils.java:123)
    at org.icefaces.ace.model.table.SortCriteria.<init>(SortCriteria.java:36)
    at org.icefaces.ace.component.datatable.DataTable.getSortCriteria(DataTable.java:1139)
    at org.icefaces.ace.component.datatable.DataTable.processSorting(DataTable.java:1281)
    at org.icefaces.ace.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:120)
    at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)
    at org.icefaces.impl.context.DOMPartialRenderCallback.visit(DOMPartialViewContext.java:854)
    at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183)
    at org.icefaces.ace.component.datatable.DataTable.visitTree(DataTable.java:1511)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIForm.visitTree(UIForm.java:371)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700)
    at org.icefaces.impl.context.DOMPartialViewContext.renderSubtrees(DOMPartialViewContext.java:502)
    at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:187)
    at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219)
    at javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:337)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:647)