if (studentsSearchBean == null) { // 1st time
studentsSearchBean = new StudentsSearchBean();
} else {
final Set<Student> students = studentsSearchBean.search();
if (students.size() == 1) {
Student student = students.iterator().next();
request.setAttribute("student", student);
request.setAttribute("choosePhdOrRegistration", new ChooseRegistrationOrPhd(student));