Java 9 ifPresentOrElse returning value

Working code:

public Student process (int id, name){
  Optional<Student> studentOpt = myrepo.findById(id);
  studentOpt.isPresent() {
    return updateStudent(id, name);
  } else {
   return createStudent(id, name);
  }

I try to change it to 'full lambdas code' (not working):

public Student process (int id, name){
  Optional<Student> studentOpt = myrepo.findById(id);
  return studentOpt.ifPresentOrElse(student-> return updateStudent(id, name), () ->  return createStudent(id, name));
}

Should I change it to full lambda? What is the cleanest? If yes, how?

Given that your methods updateStudent and createStudent involve some form of side effect and you should generally prefer side effect free lambdas, I don't recommend you use them here. In fact, a simple if-then-else block would be sufficient. However, if you are curious, the equivalent lambda would look like:

return studentOpt
    .map(unused -> updateStudent(id, name))
    .orElseGet(() -> createStudent(id, name));