src/share/classes/javax/swing/plaf/synth/SynthTableHeaderUI.java

@@ -238,11 +238,11 @@
                 SynthLookAndFeel.resetSelectedUI();
             }
 
             //stuff a variable into the client property of this renderer indicating the sort order,
             //so that different rendering can be done for the header based on sorted state.
-            RowSorter rs = table == null ? null : table.getRowSorter();
+            RowSorter<?> rs = table == null ? null : table.getRowSorter();
             java.util.List<? extends RowSorter.SortKey> sortKeys = rs == null ? null : rs.getSortKeys();
             if (sortKeys != null && sortKeys.size() > 0 && sortKeys.get(0).getColumn() ==
                     table.convertColumnIndexToModel(column)) {
                 switch(sortKeys.get(0).getSortOrder()) {
                     case ASCENDING: