Appending to file in static methods keep rewriting the whole file in Java

I have a static method in which I want to write something to a file, but it keeps rewriting the whole file.

public static void log(Class called, String functionName, String problem) {
        try {
            BufferedWriter bw = new BufferedWriter(new FileWriter("log.txt"));
            bw.append(LocalDateTime. now() + " - " + called.getCanonicalName() + " - " + functionName + " - " + problem + "\n");
            bw.close();
        } catch (IOException e) {
            System.out.println("An error occurred.");
            e.printStackTrace();
        }
    }

The file in which I am writing keeps rewriting the first line

>Solution :

The default constructor of FileWriter will rewrite the file. There is an alternative constructor that you can use:

BufferedWriter bw = new BufferedWriter(new FileWriter("log.txt", true));

Also take a look at the documentation for the append method because it does something different from what you think.