return lca.getClassName().compareTo(rca.getClassName());
int cmp = lca.getClassName().compareTo(rca.getClassName()); if (cmp != 0) return cmp; return lhs.compareTo(rhs);
		public int compare(BugInstance lhs, BugInstance rhs) {			ClassAnnotation lca = lhs.getPrimaryClass();			ClassAnnotation rca = rhs.getPrimaryClass();			if (lca == null || rca == null)				throw new IllegalStateException("null class annotation: " + lca + "," + rca);			return lca.getClassName().compareTo(rca.getClassName());		}