@NotNull
  private OrderEntryGraph getOrderEntryGraph() {
    if (myOrderEntryGraph == null) {
      RootInfo rootInfo = buildRootInfo(myProject);
      Couple<MultiMap<VirtualFile, OrderEntry>> pair = initLibraryClassSourceRoots();
      myOrderEntryGraph = new OrderEntryGraph(myProject, rootInfo, pair.first, pair.second);
    }
    return myOrderEntryGraph;
  }
@NotNull
  private OrderEntryGraph getOrderEntryGraph()