Update for updated OpenJDK base images

[tianon]

This is initial adjustments for docker-library/openjdk#322.

FYI to FROM tomcat official-images maintainers:

• convertigo: @nicolas-albert @opicciotto
• geonetwork: @doublebyte1
• xwiki: @xwiki (including the last six folks to make PRs in https://github.com/docker-library/official-images/pulls?q=is%3Apr+label%3Alibrary%2Fxwiki+is%3Aclosed as well since I don't know if that @ reference will work properly)
  • @evalica
  • @gdelhumeau
  • @surli
  • @vmassol
  • @tmortagne
  • @Enygma2002

[vmassol]

@tianon thanks for the heads up!

So at XWiki we're using FROM tomcat:8-jre8 which itself was using FROM openjdk:8-jre. From what I see in this PR, this hasn't been changed, right? (when I search for 8-jre8 in the PR I don't get a hit).

Anything we should check specifically?

Thanks again

[tianon]

@vmassol all "jre" variants of the tomcat image are going away because we have to have the JDK to compile Tomcat Native and don't have an easy way to install that temporarily like we did with the Debian-package-based openjdk:jre images 😞

[tianon]

(that might be something that could change with docker-library/official-images#5929, but as-is it's not something we can commit to right now 😞)

[vmassol]

@tianon ok so we need to move from FROM tomcat:8-jre8 to FROM tomcat:8-jdk8. I'll be making the change and send a PR. Thanks

[nicolas-albert]

I cannot test anything before Monday. How can we test a tomcat based image based on the AdoptOpenJdk ?

[tianon]

@nicolas-albert there aren't any tomcat images based on AdoptOpenJDK right now (that's being discussed in #134)

I think the confusion is that the binaries we're using for openjdk are hosted by AdoptOpenJDK, but they're not AdoptOpenJDK (they're completely vanilla OpenJDK).

The concrete outcome here for convertigo is going to be similar to either what's happening with xwiki in docker-library/official-images#5990 (moving to the new tomcat:jdk variants and dropping architectures and Alpine variants) or considering https://hub.docker.com/_/adoptopenjdk instead (and thus either waiting for #134 or essentially maintaining your own Tomcat image).