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java.lang.IndexOutOfBoundsException: Index: 0 at java.util.Collections$EmptyList.get(Collections.java:3212) at org.icefaces.ace.model.tree.LazyNodeDataModel.navToChild(LazyNodeDataModel.java:100) at org.icefaces.ace.model.tree.LazyNodeDataModel.navToKey(LazyNodeDataModel.java:72) at org.icefaces.ace.component.tree.Tree.setNodeToKey(Tree.java:157) at org.icefaces.ace.component.tree.Tree.setKey(Tree.java:125) at org.icefaces.ace.component.tree.TreeDecoder.decodeReordering(TreeDecoder.java:84) at org.icefaces.ace.component.tree.TreeDecoder.decode(TreeDecoder.java:66) at org.icefaces.ace.component.tree.TreeRenderer$1.<init>(TreeRenderer.java:64) at org.icefaces.ace.component.tree.TreeRenderer.decode(TreeRenderer.java:63) at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:832) at org.icefaces.ace.component.tree.Tree.processDecodes(Tree.java:299) at com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:573) at com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) at org.icefaces.ace.component.tree.Tree.visitTree(Tree.java:392) at javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 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 com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403) at com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:266) at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) at org.icefaces.impl.context.DOMPartialViewContext.processPartial(DOMPartialViewContext.java:322) at javax.faces.context.PartialViewContextWrapper.processPartial(PartialViewContextWrapper.java:219) at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:927)