@Autowired
private UserRepo userRepo;

@Transactional(isolation = Isolation.SERIALIZABLE)
public void change() {
    User user = userRepo.findOne("Jan");

    write("before change", user);
    sleep(2000);
    user.setPassword("new password");
    write("after change", user);
}

@Transactional(isolation = Isolation.SERIALIZABLE)
public void change2() {
    User user = userRepo.findOne("Jan");

    write("before change2", user);
    user.setSecondName("new name");
    write("after change2", user);
}

before change User(name=Jan, secondName=Adam, password=Kowalski)
before change2 User(name=Jan, secondName=Adam, password=Kowalski)
after change2 User(name=Jan, secondName=new name, password=Kowalski)
after change User(name=Jan, secondName=Adam, password=new password)

com.mysql.jdbc.exceptions.jdbc4.MySQLTransactionRollbackException: Deadlock found when trying to get lock; try restarting transaction