Delete a file after download RestAPI

Question

How can I delete the file after calling this method, I am calling this method from a web service using Spring GET Http. I want to delete the file once it is sent to the client.

    public File download(String filePath) {
        try {
            File file = new File(filePath);
           return file;
           //this line will never run !!!
           Files.delete(filePath);
        } catch (Exception e) {
            return null;
        }
    }