@Override
    public VirtualFile[] selectFiles(@NotNull JComponent parent,
                                     @Nullable VirtualFile initialSelection,
                                     @Nullable Module contextModule,
                                     @NotNull LibraryEditor libraryEditor) {
      VirtualFile vFile = Util.showSpecifyJavadocUrlDialog(parent);
      return vFile != null ? new VirtualFile[]{vFile} : VirtualFile.EMPTY_ARRAY;
    }
@Override
    public VirtualFile[] selectFiles(@NotNull JComponent parent,
                                     @Nullable VirtualFile initialSelection,
                                     @Nullable Module contextModule,
                                     @NotNull LibraryEditor libraryEditor)