I am currently upgrading a module that uses setContent(), that used to be available for JournalArticle (package com.liferay.journal.model) in 7.3.
I checked the guidelines at: https://learn.liferay.com/dxp/latest/en/liferay-internals/reference/7-4-breaking-changes.html
But I could not find a direct replacement, or anything about its removal.
Did I miss something in the breaking changes documentation? I also checked the github repository, and the method that was on 7.3.x does not seem to be present in 7.4.x.
This is one of the classes I checked when I first noticed the method was gone:
I also checked the public api at for JournalArticles, as in: