Keycloak System Requirements

[dc...@prosentient.com.au]

Hi all,

 

Apologies for cross-posting.

 

I’m just getting ready to upgrade to 15.0.2 and I thought I’d look at the system requirements: https://www.keycloak.org/docs/latest/server_installation/#system-requirements.

 

I notice it says “Java 8 JDK”, and I was thinking surely that should say JRE instead of JDK, since the installation instructions are about running the pre-built app. One wouldn’t need the whole JDK. Just the JRE.

 

Also, does Keycloak run on Java 11? This issue suggests that it does: https://issues.redhat.com/browse/KEYCLOAK-7811. There is also this thread: https://developer.jboss.org/thread/280486.

 

If it can run on Java 11, it would be great for the documentation to be updated to something like “Java 8 JRE or Java 11 JRE”.

 

Thanks!

 

David Cook

Senior Software Engineer

Prosentient Systems

Suite 7.03

6a Glen St

Milsons Point NSW 2061

Australia

 

Office: 02 9212 0899

Online: 02 8005 0595

 

[Garth]

It definitely runs on Java 11, as the default docker image runs openjdk-11.0.11. As to the JDK question, I don't know if there is a reason it needs the JDK.

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[Thomas Darimont]

Hello,

Yes, Keycloak works well with Java 11 - but is still compatible with Java 8 - although there are plans to drop Java 8 compatibility.

See: https://github.com/keycloak/keycloak/pull/8364#issuecomment-899304900

Note that the keycloak docker images have been using JDK 11 as a base for a while now.

Also note, that since JDK 11 an explicit JRE is no longer shipped with the JDK thanks to a more streamlined JDK packaging,

see: https://stackoverflow.com/questions/55868821/when-jre-was-completely-discontinued-as-a-separate-offering

Cheers,

Thomas

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