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Fwiw, I wrote a blog post about this: https://blog.ltgt.net/javax-jakarta-mess-and-gradle-solution/

Nice summary. We’ll be dealing with the aftermaths of this for a long time still 😞

Oh, and I totally forgot to talk about the API vs implementation JARs too, where the former are a subset of the latter, so you shouldn't/can't use both at the same time either (e.g.

com.sun.mail:javax.mail

contains

javax.mail:javax.mail-api

, same for the Jakarta flavors, and for all versions; for Java Mail it's even worse actually, as

com.sun.mail:javax.mail

is a bundle of

com.sun.mail:mailapi

,

com.sun.mail:smtp

,

com.sun.mail:pop3

, and `com.sun.mail:imap`: https://javaee.github.io/javamail/#Download_JavaMail_Release)