Javalin
Languages and libraries
web framework library
SHOW HN2022
377points
136comments
#96of 2,570 in 2022
Top 4%of 2022 by points
How HN took it
LovedMost comments that take a side are positive
30 positive, 30 neutral or asking, 0 mixed, 5 critical, out of 65 comments about the project. Thread score +0.38.
Design: 6 for, 1 againstIdea: 3 for, 1 againstExecution: 2 for, 1 againstDocs: 1 for, 1 againstPerformance: 1 for, 0 against
The thread, comment by comment
Each row is a top-level comment and its replies, in HN's order. Select a cell to open that comment on HN.
positive neutral or mixed critical about another commenter or something else the maker
What HN said
What people liked
Simple, straightforward docs
From 1 comment
I just wanted to say thank you for your work. The straightforward docs are some the best in my opinion when you want to go from "How do I do ..." to answer. I ended up using…
iammiles on HN
Clean, minimal API and one-line hello world
From 2 comments
I find that hello world example very pleasant to look at. Love that it's effectively a one-liner. ``` public static void main(String[] args) { var app =…
simonw on HNThat's probably the first time I see a java web framework api that actually makes me want to try it.
JodieBenitez on HN
Fast startup and lightweight compared to Spring Boot
From 2 comments
I just started using this! Spring Boot seemed so convoluted, having to go to a website to even begin. And then to have the Tomcat dependency seemed like a heavy lift just to get…
adamredwoods on HNRebuild and restart. Javalin itself starts in milliseconds (the test suite starts and stops servers across 600+ tests in less than 10 seconds). If you run in debug mode in IDEA,…
tipsee on HN
Objections
No ORM or database layer included
From 2 comments
From my understanding this framework doesn’t include an ORM. I consider the ORM one of the most important component for a web framework
adibalcan on HNJavalin offers way less, it's more or less just the web routing layer. No databases, no ORM, no config loading, etc.
tipsee on HN
Hot reload requires restart or external tooling
From 2 comments
Rebuild and restart. Javalin itself starts in milliseconds (the test suite starts and stops servers across 600+ tests in less than 10 seconds). If you run in debug mode in IDEA,…
tipsee on HNLooks nice. Does it support hot reload? We use Quarkus heavily at work and one of the nifty feature is its ability to hot reload (fast restart to be specific) within few…
reactor on HN
Some callback-based APIs (websockets, SSE) seem at odds with virtual threads
From 1 comment
I haven’t tried this framework, but just looking at some examples, the web sockets and sse seem a bit out of place. In a Loom world you’d expect these to use channels or queues…
NightMKoder on HN
Requests
Hot reload support
From 2 comments
Looks nice. Does it support hot reload? We use Quarkus heavily at work and one of the nifty feature is its ability to hot reload (fast restart to be specific) within few…
reactor on HNHow does the dev tooling work? Rebuild & restart the app each time? I find working on any sizable codebase this can take minutes even on the latest spring-boot. Quakrus has an…
helfire on HN
CORS and proxy protocol support
From 1 comment
this is very cool. quick question though - do u have a gradle build setup ? im new to java and saw this problem on spring boot. That you needed to have this bunch of complex…
sandGorgon on HN
GraalVM native compilation guidance
From 1 comment
Congrats on v5. Have you tried it yet with GraalVM and native compilation? Any gotchas?
kitd on HN
Questions
How virtual threads are used given Loom is preview
From 2 comments
Given Project Loom hasn't been available, how does it utilise Virtual Threads already?
heurisko on HNIf you run this on JDK19 with *--enable-preview*, Javalin will use Virtual Threads for the Server ThreadPool (as well as all other ThreadPools it has).
tipsee on HN
How it compares to Ktor and Dropwizard
From 2 comments
Congrats on the release! I reviewed Javalin lately and it was high on my list. We use quite a bit of Kotlin and look for a framework. I really dislike the magic that annotations…
cies on HNHow does Javalin compare with Dropwizard which is also quite lightweight?
rrampage on HN
Whether it supports rendering traditional server-side apps
From 1 comment
Can we use this to render traditional apps (no js frameworks)?
spapas82 on HN
Alternatives named
Spring Boot
From 2 comments
I just started using this! Spring Boot seemed so convoluted, having to go to a website to even begin. And then to have the Tomcat dependency seemed like a heavy lift just to get…
adamredwoods on HN> Calling a constructor is DI. ‘new’ is the only DI framework required. This feels like the sane thing to do, but sadly for historical reasons this won't work with many (if not…
KronisLV on HN
Ktor
From 1 comment
Congrats on the release! I reviewed Javalin lately and it was high on my list. We use quite a bit of Kotlin and look for a framework. I really dislike the magic that annotations…
cies on HN
Dropwizard
From 1 comment
How does Javalin compare with Dropwizard which is also quite lightweight?
rrampage on HN
Vert.x
From 2 comments
Peeking int the docs, it reminds me a little bit of Vert-X. What do you think qbout such a statement?
de6u99er on HNI respect Vert.x a lot, so I'm flattered, but Vert.x is a huge beast with focus on performance. Javalin is basically a tiny UX layer on top of Jetty. I don't think they are very…
tipsee on HN
Sparkjava
From 1 comment
Javalin is great and a worthy successor to its predecessor Sparkjava
voidfunc on HN