--- src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFCell.java	(revision 1711877)
+++ src/ooxml/java/org/apache/poi/xssf/streaming/SXSSFCell.java	(working copy)
@@ -542,9 +542,11 @@ 
     /**
      * Sets this cell as the active cell for the worksheet
      */
+    @Override
     public void setAsActiveCell()
     {
-//TODO: What needs to be done here? Is there a "the active cell" at the sheet or even the workbook level?
+        throw new UnsupportedOperationException();
+        //TODO: What needs to be done here? Is there a "the active cell" at the sheet or even the workbook level?
         //getRow().setAsActiveCell(this);
     }