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.
Changes
Server-sent events were broken by 4.5.0, but they should be working like before now
An option to programmatically close the SSE session has been added
You can now collect errors from NullableValidator
You can now call getOrThrow on all Validators
The TestUtil class in the javalin-testtools module has been deprecated in favor of JavalinTest