Can't generate random string.
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    for (int j = 0; j < fileBytes.size(); j++) {
    					bitMap = convert.convertByteArray(fileBytes.get(j));
    					db.addContact(new Case(UUID.randomUUID().toString(), "1234",
    							bitMap[0], bitMap[1]));
    				}

This codesnippet will make n objects of the `case` class based on how many files `fileBytes.size()` can list out. As you can see I use the `UUID.randomUUID().toString()` just to generate a random `String`, this is the fist parameter in the `Case` constructor. Each of these objects is saved to a `SQLite` database. This doesn't work, the random generated String doesn't show up. But if I replace the `UUID.randomUUID().toString()` with `Integer.toString(j)` this will show up. I cant really see why it shouldn't work.. 

Any ideas? 