Noob question: Do Kotlin coroutines improve performance over RxJava Observables?

“it depends” 🙂

Performance is improved by carefully measuring, optimizing and understanding things. There is no silver bullet 🙂

@nfrankel @orangy At work they want me to show performance improvement not just “syntactic sugar” 😞

Make a benchmark with your typical workload and see it? Or not…

yes it really depends on your context there’s no black or white answer just code one of your use-case in coroutines and compare the performance under different loads

Also take into account (or your presentation), that “syntactic sugar” is real $$$ in maintainability.

but that’s not possible to measure it 😞

Well, we can measure it in the number of “I’d better not touch this mess” per attempt to fix the bug.

Syntactic sugar is kind of a loaded phrase, if we’re being honest

I know, I don’t like it, but that’s what he was implying.

it’s not necessarily a bad thing, but it’s not hard to use the term disparagingly

especially if you’re coming from the perspective of someone who doesn’t code often but is responsible for many developers

For a principal architect I’d use “paradigm shift” instead of “syntactic sugar”

Paradigm shift kinda feels a bit buzzwordy, don’t you think?

May be let’s go to #random ? It’s becoming offtopic

oh, true, my bad

@Ravi Hasija It's tragic that the principal architect is asking you this kind of question. He's a principal, not only should he already know about Kotlin but he should already have an answer to that question.

having some annoying issues writing transactional unit tests? with java transactional was the default jpa db behavior, now i cant even seem to get it working when extending any of the springcontextclasses (abstractTransactionalTestNGSpringContextTests in particular)

what i want by default is to have transactionality and not add annotations all over the place just to get it

@michael salmon I think you are much more likely to get help from the channel for your particular framework.

@pavel thanks! didn’t know there was one. fantasic

Hello everyone i'm a java developer and after some benchmarks i decided to invest some time in kotlin lang as it become supported by a majority of frameworks. what's the best path to learn kotlin for server side ?

Thanks for the instructions 👍

start with the kotlin koans then start migrating some of your project from java to kotlin on your own branch then write some kotlin code yourself e.g. a controller, a service, a repository, an entity then notice how though it’s kotlin, it still feels like java go read some kotlin code start applying the patterns you recognize to your own code

@MouradKhairane Welcome onboard the Kotlin train. I'd definitely start with learning Kotlin syntax/idioms via the koans & then use Kotlin with a server framework that you already most familiar with from Java. The good news is that Kotlin basically just works but makes the code much cleaner. The Kotlin specific versions of the Java frameworks basically just add a veneer over the framework to make it even better. Most importantly of all, have

fun

& ask questions as the Kotlin community is very friendly

@MouradKhairane If you are looking for some exercise similar to kotlin coans but just focused on migration from Java to Kotlin have a look at this: https://github.com/springernature/kotlin-dojo

Does anyone here using MongoDB with Morphia ODM?

I have used it with Play framework

it was fine, but using MongoDB as main DB for ordinary web app was not fine