更新文件不适用于jar中的ObjectOutputStream

Question

我正在尝试更新文件.ser： 这是一个片段，没有所有无用的东西（试试......等）

String file1 = "data.ser";
InputStream fis = this.getClass().getResourceAsStream(file1);
InputStream buffer = new BufferedInputStream(fis);
ObjectInputStream ois = new ObjectInputStream(buffer)
ArrayList<Object[]> list = new ArrayList<>();
list = (ArrayList) ois.readObject();
//Reading works fine, I got all my data in list
/*
Some operations in list
*/
OutputStream fout;
fout = new FileOutputStream(file1);
ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(file1));
//Here I tried to verify list; it's okay, all is there
oos.writeObject(list);
//I tried also some print just after that, and it works

这不会更新我的文件;可能有什么麻烦？ PS：在IDE上，一切都很好，但是当运行jar时，它不是;可能我不能在jar中更改文件？！