[jcelerier]

But how do you handle configuration then ? At some point you want a user-facing UI where the available features (which are generally classes) are listed and the user can choose the feature, say which log backend is enabled, without having to change code - that's the whole point of it. (And the most tedious code to write by hand - a complete waste of time)

[pgwhalen]

> But how do you handle configuration then ?

In the main method, then you can pass the configured values wherever you need to when new-ing classes.

> At some point you want a user-facing UI where the available features (which are generally classes) are listed and the user can choose the feature, say which log backend is enabled, without having to change code - that's the whole point of it. (And the most tedious code to write by hand - a complete waste of time)

I consider DI a valuable pattern, but I've never experienced anything close to this need.

[kaba0]

What happens with proxied classes? My ClassWithTransactions is actually a subclass of the written one auto-generated by Spring. I can’t inject a new instance of that manually.

And you may say that you don’t need Aspect Oriented programming, but the usual handling of transactions in many other languages without some meta-programming is.. to not handle transactions. Putting a single annotation over a method is imo a very elegant way to handle this needed functionality.

[pgwhalen]

This is all considerably more abstraction than I have wanted or needed when writing Java. When handling transactions, I’ve passed around the same connection before committing.

[kaba0]

The point of the transaction in this context is that both the database(s) and the business logic/state stay in sync. I don’t think that naive attempts will be logically correct.

[pgwhalen]

What do you consider naive? JDBC supports transactions, I’ve had success with that.

[kaba0]

As I mentioned, you will have to roll back not only the database, but the relevant application state as well. This is really error-prone if repeated enough times, or the flow of control is through many different methods, etc.

[jcelerier]

> I consider DI a valuable pattern, but I've never experienced anything close to this need.

Literally every non-toy software I had to develop in my life required that lol

[pgwhalen]

Do you seriously allow users to configure which logging framework is used through a UI? Perhaps I’m misunderstanding what you’re saying.

[jcelerier]

in my case it's more often which audio, gamepad or graphics backend but yes, I actually had the log backend configuration request once ! (wanted to choose to log stuff in text files or websockets depending on the case, for a GUI app ; there was an explicit requirement that the entire software could be configured and used with only a mouse, no keyboard so many configuration menus were needed)