Replace javax servlet classes with Jakarta servlet

[madoxas]

Fixes ring-clojure/ring#517

Note: This is a breaking change!

I'm open for suggestions, if there's a need to support both javax and jakarta servlets in the code.

[weavejester]

Thanks for the PR. This should be okay, as the javax servlets are deprecated in pretty much everything, and Lein-Ring is not 1.0 so there's no guarantee of backward compatibility. That said, if someone complains we can always put an option in to switch from one to the other.

Have you tested this change? Does it produce a war file that runs under a servlet container?

Also, can you change the commit message to:

Replace javax servlet classes with Jakarta servlet

This will make it consistent with the other commits in the repository.

[madoxas]

Also, can you change the commit message

Done.

Have you tested this change? Does it produce a war file that runs under a servlet container?

Yes, tested on Tomcat 11. Works as expected.

[jeffdik]

Thank you for your work on this. Any idea of when this will be released?

[waynedyck]

I tested this pull request today with a project and it fixed the error I was seeing previously when running lein ring uberwar

Previously bumping from ring "1.10.0" to any later version produced the following error:

Syntax error macroexpanding at (jetty.clj:1:1).
Execution error (FileNotFoundException) at ring.adapter.jetty/loading (jetty.clj:1).
Could not locate ring/websocket__init.class, ring/websocket.clj or ring/websocket.cljc on classpath.

After using the pull request locally, lein ring uberwar correctly generated the .WAR file without errors.