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java.lang.NullPointerException at org.primefaces.component.datatable.DataTable.findColumnInGroup(DataTable.java:905)[primefaces-5.2.jar:5.2] at org.primefaces.component.datatable.DataTable.findColumn(DataTable.java:896)[primefaces-5.2.jar:5.2] at org.primefaces.component.datatable.DataTable.getSortColumn(DataTable.java:1401)[primefaces-5.2.jar:5.2] at org.primefaces.component.datatable.feature.SortFeature.singleSort(SortFeature.java:136)[primefaces-5.2.jar:5.2] at org.primefaces.component.datatable.DataTableRenderer.preRender(DataTableRenderer.java:109)[primefaces-5.2.jar:5.2] at org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:83)[primefaces-5.2.jar:5.2] at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at com.sun.faces.facelets.component.RepeatRenderer.encodeChildren(RepeatRenderer.java:104)[jsf-impl-2.2.8-jbossorg-1.jar:] at com.sun.faces.facelets.component.UIRepeat.process(UIRepeat.java:621)[jsf-impl-2.2.8-jbossorg-1.jar:] at com.sun.faces.facelets.component.UIRepeat.encodeChildren(UIRepeat.java:1110)[jsf-impl-2.2.8-jbossorg-1.jar:] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.render.Renderer.encodeChildren(Renderer.java:176)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1859)[jboss-jsf-api_2.2_spec-2.2.8.jar:2.2.8] at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:456)