#ktor javalin #http4k are Kotlin-driven microframeworks if you need a small web server, API, REST, etc. They are mostly adhering to https://12factor.net/ though might need some discipline in using. Spring is indeed an ultimate hammer, but it’s heavy, starts slow, and not as performant at scale as others. See https://www.techempower.com/benchmarks/previews/round15/ for some benchmarks.

@anderson.faro typically if you’re doing 12 factor with a microframework, you might also need separate libs for: 1. converting runtime ENV variables to system config - see cfg4k, configur8, konfig etc 2. Performance/metrics implementation - lots of options depending on your needs - (e.g http4k uses a plugin model for micrometer which then backs onto lots of other systems) 3. Events/logging implementation - once again, lots of options - but the core ideal is to use biz events instead of random logging and then plug that into a reporter backend 4. Not strictly required, but we find that a distributed tracing option is invaluable. Zipkin/opentracing etc. 5. Templating - if you’re doing web. All these should be simple to plugin in your chosen stack without requiring a dependency tree containing 200 different JAR files 😀

And 6. OAuth or JWT.... some sort of authentication handling with role support for your resources.

Hey All - We are trying to decide if we want to try to do our core dev in Kotlin instead of Java and would love to chat with someone (via voice by preference) who has lead a team that built and deployed Kotlin services in a production environment where those services are a core part of your company (not just small, side projects but literally your product would not function/be successful without them). Would like to understand pros and cons of the choice, biggest issues the team faced etc. Based in San Francisco, CA but can work with your timezone.

heroku appears to start at $8 a month for db access

https://12factor.net/ for more info Heroku even has a GitHub button to deploy right from the page 🙂 Like here https://github.com/JetBrains/kotlinconf-app/ with #ktor of course 😉

@dave08 I was in a meeting with docker last week and can confirm that docker EE now has both kubebetes implementation and a trusted image registry built right in that does image security scanning. Looks pretty sweet, but probably not cheap at scale. Interestingly, I think they use docker swarm under the hood to manage the node scaling of the actual k8s nodes (as opposed to workload scaling). Also, the latest edge version of docker CE for Mac has k8s built in, although you do need high Sierra to make it work - no more minikube required. (Disclosure: I haven't used it yet)

is there a de facto web framework for kotlin?

do you have any examples of these startups that we can see now?

dropwizard seems to be a glue, not backed by a big company. why do people choose it over spring?

wouldn't it make a difference if the library/framework is written in kotlin itself, like spring boot 2.?

I thought it does not work great judging by google search.

there is no up to date example/starter project.

is grpc in java a framework, as in a framework comparable with spring?

it seems to be limited to rpc only, and not opinionated about data layer, authentication etc.

@m I'm putting together a starting app DropWizard + Postgres + Heroku to see how it feels

Not getting a lot of luck with heroku so far, the deploy process dies out of memory while gradle downloads its dependencies. Not sure this can be done on the free option.

@cedric feel free to ping me here if you run into any other stuff (or have suggestions for how we can make it a better experience)

I wonder how it relates to #server ?

Anyone has specific use cases, when there can be multiple (by “and”, by “or”) authentication providers for a single endpoint?

Hello, guys. Can you please checkout a stackoverflow post and give some answers regarding what I posted there? https://stackoverflow.com/questions/49033548/kotlin-framework-suggestions-for-developing-a-server-client-application?noredirect=1#comment85071925_49033548

Hello guys, I'm not sure if this is the right channel for my question but, could anyone suggest any lib for parsing XML to Data class? Thanks a lot!

If anybody was looking for an async postgres library, I just found this: https://github.com/vietj/reactive-pg-client (J. Viet is the head of the Vert.x team), I just didn't try it yet, but it looks promising... if it's based on the Vert.x version it looks stable (I have production code on the Vert.x version). It even has Kotlin docs https://www.julienviet.com/reactive-pg-client/guide/kotlin/index.html

Am getting noclassdeffound error while writing servlets in kotlin. Using tomcat on Intellij. Any help is appreciated.

Hello guys, could you help to give me some suggestion on using JPA with Kotlin? I was trying Hibernate when I realized it uses lazy-loading which requires the entity to be open. I am getting “Getters of lazy classes cannot be final” from the log. Should I switch from “data class” to “open class” and then implement the standard JAVA way, or it is better to use a different ORM like Exposed?

Hi! I'm starting with kotlin+exposed, how does the Database object got passed to transaction {} method?

Database.connect("jdbc:<postgresql://localhost:5432/testdb>", driver = "org.postgresql.Driver", user = "..", password = "...")
    transaction {

and which is the common approach to initialise Database, so I don't create it in each service method? Thanks in advance

Thanks @dave...putting together a comparison of Kotlin for server backends for a local Kotlin meetup. Would like something more realistic (w/ login/DB support) than ToDoMVC. I swear someone did something like todobackend w/ Kotlin frameworks or put together a Kotlin framework feature list in this channel at some point last year, but I can't find it 😛

interesting to see (in the techempower link) that ktor beats grizzly+jersey, which is my stack of choice in java

add @JvmOverloads for the constructor? though kotlin-jpa sounds like it should have done something for it...

8 is probably safest since it's an LTS release