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

*** 238,248 ****
                  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();
              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:
--- 238,248 ----
                  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();
              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: