Java : Get random but existing country-code, city and birthday for test-data.

I am working on a Java application for which I am trying to add random data to the database. I managed to add random variables like Names, etc. But there is functionality in the project which is tied to actual country-code, cities, birthdays.

Unfortunately, I cannot find anything which will help me generate all this values which exist in real world.

I tried adding birthday, but get out of range failure for that.

Code :

@Override
    public void addRandom() {
        int minimum = 1000;
        int maxValue = 2000;
        for(int i = 0; i< 1000; i++){
            student.setCity(new BigInteger(130, random).toString(32));
            student.setCountry(new BigInteger(130, random).toString(32));
            student.setDesiredCity(new BigInteger(130, random).toString(32));
            student.setDesiredCountry(new BigInteger(130, random).toString(32));
            if(getRandomBoolean()){
                student.setGender("male");
            }else {
                student.setGender("female");
            }
         //   student.setStudentBirthday(new Date(Math.abs(System.currentTimeMillis() - RandomUtils.nextLong())));
}

Thank you.