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Sorting on different attributes in a GWT celltable Widget
final ListHandler<FeatureSummaryObject> failedColSortHandler = new ListHandler<FeatureSummaryObject>(dataProvider.getList());
        failedColSortHandler.setComparator(failedCol, new Comparator<FeatureSummaryObject>() {

            @Override
            public int compare(FeatureSummaryObject o1, FeatureSummaryObject o2) {
                return o1.getFailed() - o2.getFailed();
            }
        });
        table.addColumnSortHandler(failedColSortHandler);
        failedCol.setSortable(true);


        ListHandler<FeatureSummaryObject> featureColSortHandler = new ListHandler<FeatureSummaryObject>(dataProvider.getList());
        featureColSortHandler.setComparator(featureCol, new Comparator<FeatureSummaryObject>() {

            @Override
            public int compare(FeatureSummaryObject o1, FeatureSummaryObject o2) {
                return o1.feature.compareTo(o2.feature);
            }
        });
        table.addColumnSortHandler(featureColSortHandler);

        featureCol.setSortable(true);

urlColumn.setSortable(true);
   mimeColumn.setSortable(true);
   sizeColumn.setSortable(true);

// Add sorting for the Name column
   ListHandler<Asset> urlSortHandler = new ListHandler<Asset>(dataProvider.getList());
   urlSortHandler.setComparator(urlColumn, new Comparator<Asset>() {
     public int compare(Asset o1, Asset o2) {
        ....
     }
   });
   table.addColumnSortHandler(urlSortHandler);

   // Add sorting for the Size column
   ListHandler<Asset> sizeSortHandler = new ListHandler<Asset>(dataProvider.getList());
   sizeSortHandler.setComparator(sizeColumn, new Comparator<Asset>() {
     public int compare(Asset o1, Asset o2) {
        ....
     }
   });
   table.addColumnSortHandler(sizeSortHandler);

   // Add sorting for the Type column
   ListHandler<Asset> mimeSortHandler = new ListHandler<Asset>(dataProvider.getList());
   mimeSortHandler.setComparator(mimeColumn, new Comparator<Asset>() {
      public int compare(Asset o1, Asset o2) {
         ...
      }
   });
   table.addColumnSortHandler(mimeSortHandler);