缓冲的读取器在读取FIS时引发FileNotFound异常

Question

在第一种方法中，我在applicatin目录中创建了一个文件，然后尝试使用BufferedReader读取该文件，但是由于某种原因，该应用程序始终抛出FileNotFound异常，我也不知道为什么。

select
  id, string_agg (doc_id, ',')
from table
group by id
having
  count (*) > 1 or
  min (doc_id) not in ('01', '02')

这是阅读器代码

Writer output = null;
    File file = new File(getApplicationContext().getFilesDir(), "past");
    output = new BufferedWriter(new FileWriter(file, true));
    output.write(format_1 + "Overall positivity was " + sprog);
    output.close();

这是调试抛出的东西

public void past(View v) throws IOException {
    try(BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("past"),StandardCharsets.UTF_8))){

        String line;

        while ((line=br.readLine()) != null){
            System.out.println(line);
        }
    }
}