An ace:dataTable is set to do multiple row selection. The table uses rowExpandsion where these rows can also be selected. If a row in the expansion is selected then deselected and another row is selected, upon any action on the page an IllegalArgumentException is thrown.

Caused by: java.lang.IllegalArgumentException
at org.icefaces.ace.model.table.TreeDataModel.getRowData(TreeDataModel.java:62)
at javax.faces.component.UIData.getRowData(UIData.java:371)
at org.icefaces.ace.component.datatable.DataTableDecoder.decodeMultipleSelection(DataTableDecoder.java:202)
at org.icefaces.ace.component.datatable.DataTableDecoder.decodeSelection(DataTableDecoder.java:52)
at org.icefaces.ace.component.datatable.DataTableRenderer.decode(DataTableRenderer.java:61)
at javax.faces.component.UIComponentBase.decode(UIComponentBase.java:787)
at org.icefaces.ace.component.datatable.DataTable.processDecodes(DataTable.java:359)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1176)
at javax.faces.component.UIForm.processDecodes(UIForm.java:225)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1176)
at javax.faces.component.UIComponentBase.processDecodes(UIComponentBase.java:1176)
at javax.faces.component.UIViewRoot.processDecodes(UIViewRoot.java:933)
at com.sun.faces.lifecycle.ApplyRequestValuesPhase.execute(ApplyRequestValuesPhase.java:78)
... 22 more