Important: This news article covers an old version of Javalin (v4.6.0). The current version is v6.1.3.
See the documentation page for up-to-date information.


  • 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