Exception Handling: where?

[Majid Al-Fifi]

I have a JSF app.

There is one class that interacts with all the views(ControllerClass). Only this class has info about the views. this class has another class to handle database access(DBManager).

This database access class doesn't know anything about the views.

I want to inform the views about what is happening in the database but that should be done thru DBManager.

how can I do that? shall i return exceptions to DBManager and if there are no exceptions and operation was ok how can I inform about that?

Thanks,
Majid

[Ernest Friedman-Hill]

Moving to our JSF forum.

[Ali Gohar]

Not understood your question exactly, please ellaborate more or paste some code to show what do you want to achieve.

[Majid Al-Fifi]

Controller class has a method

public void isertEmp(ActionEvent ae)
{
    Emp e = ...ae.getParam()......
    DBManager.isertEmp(e);
    //write to a label in the view what happend
    //(Inserted, already exist, wrong ...)
}

DBManager:

public void isertEmp(Emp e)
{
    try{//sql to isert e}
    catch(..){..}  
}

now what is the best way to communicate to the controller what happened with the DBManager. I don't want to access the view from DBManager(not good design)

Thanks,
Majid

[Ali Gohar]

Use FacesMessage to display your message on the view. It can be of type INFO, WARNING, ERROR or FATAL.