What's Javalin? Javalin is a very lightweight Java and Kotlin web framework which focuses on simplicity and Java/Kotlin interoperability.
Read more on our landing page.
Bugfixes
A bug was introduced in Javalin 4, which made Javalin fail to terminate SSE messages properly. This has been fixed.
A possible race condition in async handling has been fixed
The ValidationException class is now a RuntimeException rather than an Exception
There was a memory leak in GZIP handling which has been plugged