Question

I have a simple User Account application in which the user is able to change his details.

Updating the Database

The Managed Bean’s method which takes the form parameters and calls the Service method:

public String changeDetails(){
    Date date = DateUtil.getDate(birthDate);
    Integer id = getAuthUser().getId();
    UserDetail newDetails = new UserDetail(id, occupation, date, originCity, residenceCity, description);

    EntityTransaction transaction = getTransaction();
    userService.updateDetail(newDetails);
    transaction.commit();

    return null;
}

The Service Method:

public boolean updateDetail(UserDetail newDetails) {
    boolean ok = true;
    if (newDetails != null) {
        UserDetail user = readDetail(newDetails.getId());

        user.setOccupation(newDetails.getOccupation());
        user.setOriginCity(newDetails.getOriginCity());
        user.setResidenceCity(newDetails.getResidenceCity());
        user.setBirth(newDetails.getBirth());
        user.setDescription(newDetails.getDescription());
    }
    return ok;
}

Fetching data from DB

@PostConstruct
public void init(){
    userService = new UserService();
    sessionController.setAuthUser(userService.read(getAuthUser().getId()));
    originCity = getAuthUser().getUserDetail().getOriginCity();
    residenceCity = getAuthUser().getUserDetail().getResidenceCity();
    occupation = getAuthUser().getUserDetail().getOccupation();
    birthDate = DateUtil.getStringDate(getAuthUser().getUserDetail().getBirth());
    description = getAuthUser().getUserDetail().getDescription();
}

The problem is that the behavior of this code is different. Sometimes I obtain the desired result: once I submit the new details and call the @PostConstruct init () the new details are printed. Some other times the old details are printed even though the DB entry is updated.

Conclusion: Sometimes the JPA brings me different result from what is in the DB. I guess that this results consist of data from the Persistance Context, data which isn’t updated. Is there a way in which I can be sure that the JPA always brings the data directly from the DB? Or is there something I’m missing?

Answer 1

If you are using JPA 2 then @Cacheable(false) on your entity definition should make it read from the DB every time.