Question: How to handle multiple exceptions throwed by Services?

[Baterka]

I read your article and checked your pattern and I was surprised that my architecture is very similar to yours. But I not found one thing I am searching for quite for a while:

How to handle more errors from Service? For example I have Service User with method activateUser. This method recieve activation token and based on token's validity (user not already active, token exists, token not expired, user exists) I activate user or not.

The problem is that there is lot of things what can go wrong and throwing just one type of error is not good for clients. I am using i18n so I am translating keys to texts inside my controller.

Should I just throw those keys from my Service?

Now I am just trying to have every service method to do one thing so I can throw 1 error. But then I am moving too much stuff into controller:

1. Does user exists?
   If not throw not exists error
2. Is user already active?
   If not throw already active error
3. Is token not expired?
   If not throw token expired error
4. Does database update failed?
   If not throw error while saving error

This is just example and I have much more of this trough project, where I have controller full of one-time-use services because I need to return different error messages for each one of them.

Hope you understand my frustration and have some more expirience what you can share :)

[fatal10110]

There is also another problem, u should able to map errors/exceptions to relevant response code. Someone(controller?) should know how to map them to relevant response code...
Doing it by "message" not a best way, so I guess every error or group of errors(exceptions) should have an identifier.