} else if (groupBy.equals(GROUP_BY_BUG_CATEGORY)) { return bugInstanceCategoryComparator;
	private Comparator<BugInstance> getGroupComparator(String groupBy) {		if (groupBy.equals(GROUP_BY_CLASS)) {			return bugInstanceClassComparator;		} else if (groupBy.equals(GROUP_BY_PACKAGE)) {			return bugInstancePackageComparator;		} else if (groupBy.equals(GROUP_BY_BUG_TYPE)) {			return bugInstanceTypeComparator;		} else			throw new IllegalArgumentException("Bad sort order: " + groupBy);	}