Vaadin 24

[mvysny]

Add support for Vaadin 24. Since Vaadin 24 depends on new jakarta 5 servlet api, this probably it impossible for the same Karibu codebase to support both Vaadin 14, 22, 23 and 24. Therefore, we may need to create a branch 1.3.x which would target Vaadin 23 and lower, while master branch would target Vaadin 24+.

[mvysny]

Yeah, it's not possible: KT internally uses javax.servlet.ServletContext and passes it to LookupServletContainerInitializer.onStartup() which takes javax.servlet.ServletContext in Vaadin 23 and jakarta.servlet.ServletContext in Vaadin 24 as its parameter.

We need separate branches. This could also be an opportunity to clean out old Vaadin 14 hacks.

That also unfortunately means that we need to maintain two branches. No problem, it's fine :)

[mvysny]

Blocked by: vaadin-spring 24.0.0.alpha5 depends on Spring 3.0.0.rc1 which is not present in maven central.

Tasks:

• [x] Remove support for Vaadin 8 since it's end-of-life: https://vaadin.com/vaadin-8; Fix README.md on master and link Vaadin 8 doc to the 1.3.x branch
• [x] Keep karibu-testing-v10, karibu-testing-v23 for now - it will vastly simplify backporting/merging/cherry-picking between branches
• [x] Create karibu-testing-v24 which depends on Vaadin 24
• [x] Configure javac/kotlinc to produce Java 17 bytecode (this requires Spring upgrade)
• [x] Remove support for IronList and IronIcon (they've been removed from Vaadin 24)
• [x] Remove support for PolymerTemplate (removed from Vaadin 24)
• [x] Make all karibu-testing-v* depend on Vaadin 24 and make it compile; the tests may fail atm. Disable Groovy if it fails.
• [x] Make all tests run with Vaadin 24. The Spring support requires final Spring release, which requires newer vaadin 24.
• [x] Make Groovy work again if possible; keep disabled/remove if not possible.
• [x] Cleanup gradle.properties
• [x] Revisit the code and clean up crazy reflection from Vaadin14+23 times.
• [x] Remove mock-servlet-environment in master - no longer necessary in jakarta world. mock-servlet-environment will be maintained as part of 1.3.x branch
• [x] Versioning: master will track 2.0.x and only support Vaadin 24, while a new branch 1.3.x will track Vaadin 23 and older.

[mvysny]

I should use vaadin-spring-24.0.0.alpha9 with Vaadin 24.0.0.alpha5 which then uses Spring boot 3.0.0

[mvysny]

Sounds good! Vaadin 24 support implemented on master. I'll close this ticket and make a preliminary release :+1: