Of the three web server frameworks I ve found in Kotlin ktor

Question

Of the three web server frameworks I ve found in Kotlin ktor javelin and sparkjava kotlin are there any different design goals or use cases which would help me choose between them I ve been using spark kotlin quite happily and I m looking to build straightforward web applications But javelin in particular seems to sell itself as better than spark kotlin

rrva · Answer

Not to answer your question but we use a fourth <http jooby org doc lang kotlin >

dave08 · Answer

< v79> Ktor is based on coroutines making async operations much more efficient but actual async libs like for db access are currently missing for now I opened an issue to propose Vert x async libs integration with ktor Also Vert x can be used w coroutines but has tons more features that might not be necessary in your case Docs are still missing for ktor so you need to learn from source code and examples If you re not looking for performance your other options moght be simpler

rrva · Answer

Here are some design thoughts on jooby <https medium com espina edgar java micro frameworks why jooby 59f0b346e819>

rrva · Answer

But having a coroutine based http client is surely a sweet thing We use <https github com AsyncHttpClient async http client> and wrap coroutines around that

rrva · Answer

There are some advantages besides raw scalability namely not having to size thread pools etc

rrva · Answer

But otherwise asyncio can be overkill or just extra complexity if you do not need it

v79 · Answer

I don t think performance is a concern for me at all really Low volume stuff I m more interested in integration with templating engines validation model binding a little bit of the sort of magic that SpringMVC brings for instance

dave08 · Answer

< rrva> What about data access like mysql and postgres any async libs there

rrva · Answer

<http jooby org doc jdbc > No experience myself

dave08 · Answer

That s async and decoupled from jooby

rrva · Answer

Hmm would not think so

rrva · Answer

I think you d have to use <http jooby org doc rxjava jdbc > then

rrva · Answer

Here is the datastore section <http jooby org doc datastore > Maybe each of these have async options

dave08 · Answer

Funny to have to include rx for such a thing but I guess I ll look into all these jooby modules they seem to be working very hard there smile maybe I ll uncover some treasure lib

rrva · Answer

<http jooby org doc requery > has a KotlinEntityDataStore

rrva · Answer

which looks sync

rrva · Answer

but this is async which jooby has modules for <https requery github io javadoc io requery reactivex ReactiveEntityStore html>

dave08 · Answer

Thanks I ll take a look

rrva · Answer

I guess you would have to bridge between rxjava and coroutines in some cases Maybe it s nicer if the libraries just use CompletableFuture etc

tipsy · Answer

< v79> if you have any questions about javalin feel free to ask either in channel or direct message