Maven's version resolution mechanism determines which version of a dependency to use when multiple versions are specified in a project's dependency tree. Here's how it works:
- Nearest Definition Wins: When multiple versions of the same dependency appear in the dependency tree, the version closest to your project in the tree will be used.
- First Declaration Wins: If two versions of the same dependency are at the same depth in the tree, the first one declared in the POM will be used.
Yeah but version ranges are fiction. Some says: we require libpupa 0.2.0+. Sure you can find a version in that range. But what if it doesn’t work? How can you know that your library will work with all the future libpupa releases in advance?
I worked for 20 years in an ecosystem that didn’t have lockfiles and had reproducible builds before the term was invented, and now you come and tell me that it couldn’t be?
It’s totally fine in Maven, no need to rebuild or repackage anything. You just override version of libinsecure in your pom.xml and it uses the version you told it to
Clojure Electric is different. It’s not really a sync, it’s more of a thin client. It relies of having fast connection to server at all times, and re-fetches everything all the time. They innovation is that they found a really, really ergonomic way to do it
If you think of an existing database, like Postgres, sure. It’s not very convenient.
What I am saying is, in a perfect world, database and server will be the one and run code _and_ data at the same time. There’s really no good reason why they are separated, and it causes a lot of inconveniences right now.
Ah, no. Not really. People sometimes think about conflict resolution as a problem that needs to be solved. But it’s not solvable, not really. It’s part of the domain, it’s not going anywhere, it’s irreducible complexity.
You _will_ have conflicts (because your app is distributed and there are concurrent writes). They will happen on semantic level, so only you (app developer) _will_ be able to solve them. Database (or any other magical tool) can’t do it for you.
Another misconception is that conflict resolution needs to be “solved” perfectly before any progress can be made. That is not true as well. You might have unhandled conflicts in your system and still have a working, useful, successful product. Conflicts might be rare, insignificant, or people (your users) will just correct for/work around them.
I am not saying “drop data on the floor”, of course, if you can help it. But try not to overthink it, either.
- Reliable communication is hard
- Optimistic writes should on client are hard
- Tracking subsets of data is hard (you don't want the entirety of Datomic on the client, do you?)
- Permissions are hard in this model
Why didn't I implement it? Mostly comes down to free time. It's a hobby project and it's hard to find time for it. I also stopped writing web apps so immediate pressure for this went away.
All good points, all true. But what’s also true is that current trend is to come up with arbitrary-looking controls even on apps made by Apple themselves. Nobody knows what native is supposed to look like. I’m not saying it’s good, it’s just what is happening.
- Nearest Definition Wins: When multiple versions of the same dependency appear in the dependency tree, the version closest to your project in the tree will be used.
- First Declaration Wins: If two versions of the same dependency are at the same depth in the tree, the first one declared in the POM will be used.