我在JavaFX中使用文件选择器对话框，而MACOSX做出了神秘反应

Question

当我在JavaFX中使用打开的对话框时，收到此奇怪的错误消息。

$ java FileChoose objc[57243]: Class FIFinderSyncExtensionHost is implemented in both /System/Library/PrivateFrameworks/FinderKit.framework/Versions/A/FinderKit (0x7fff86988c90) and /System/Library/PrivateFrameworks/FileProvider.framework/OverrideBundles/FinderSyncCollaborationFileProviderOverride.bundle/Contents/MacOS/FinderSyncCollaborationFileProviderOverride (0x12e797cd8). One of the two will be used. Which one is undefined.

文件打开得很好，但是在 控制台令人不安。这是“违规”代码。

   openItem.setOnAction( e ->
    {
        FileChooser fc = new FileChooser();
        fc.setTitle("Open File...");
        File f = fc.showOpenDialog(primary);
        if(f == null)
        {
            return;  //user hit cancel; skedaddle
        }
        currentFile = Optional.of(f);
        try
        {
            BufferedReader br = new BufferedReader(new FileReader(currentFile.get()));
            StringBuffer sb = new StringBuffer();
            String line;
            while( ( line = br.readLine()) != null)
            {
                sb.append(line + "\n");
            }
            ta.setText(sb.toString());
            br.close();
        }
        catch(FileNotFoundException ex)
        {
            System.err.printf("File %s not found", currentFile.get().getAbsolutePath());
        }
        catch(IOException ex)
        {
            System.err.printf("Death");
        }
    });

还有其他人看到过这种奇怪吗？这似乎是MacOSX的怪癖。我正在运行High Sierra 10.13.6。