Read a file multiple times

I, I've this code:

public class Main {

    public static void main(String[] args) {

        try {

            FileWriter fstream = new FileWriter("out.txt");

            BufferedWriter out = new BufferedWriter(fstream);

            FileReader input = new FileReader("in1.txt");

            BufferedReader bufRead = new BufferedReader(input);

            FileReader input2 = new FileReader("in2.txt");

            BufferedReader bufRead2 = new BufferedReader(input2);

            String line;

            String line2;

            line = bufRead.readLine();

            line2 = bufRead2.readLine();

            bufRead2.mark(7000000);

            while (line != null) {
                while(line2 != null) {
                    out.write(line + line2 + "\n");
                    line2 = bufRead2.readLine();
                }

                line = bufRead.readLine();
                bufRead2.reset();
            }

            bufRead.close();
            bufRead2.close();
        } catch (ArrayIndexOutOfBoundsException e) {
            e.printStackTrace();

        } catch (IOException e) {
            e.printStackTrace();
        }
}
}

Basically I want to read the file in1 and for each string founded,
combine it with all the in2 strings and write all in out:
For example:
in1.txt:

aaa
bbb
ccc
ddd

in2.txt:

eee
fff
ggg
hhh
iii

out.txt:

aaaeee
aaafff
aaaggg
aaahhh
aaaiii
bbbeee
bbbfff
....
dddiii

This will implement that for each line in in1.txt the bufferedreader
of in2.txt will be reset.
Obviusly this work onli for the first string of in1.txt.
Hi read the documentation for mark() and reset() but I can't solve
nothing with these methods.
I've to use vectors?
Maybe is better to use fileinputstream?

Please help me.

ps: I'm out of scholl and this is not a trick for solve homeworks (I
hate that) and I really try to solve myself but I can't.

cheer,
Federico.