The latest weekly releases dropped support for Java 8, so you will need to
update to Java 11 at a minimum. You may need to look if there is a separate
yum package for Java 11 (e.g., if Java 8 is still the default in your OS,
then yum update java may not update to Java 11, it may just update to the
latest Java 8).

On Wed, Sep 14, 2022 at 8:59 AM eric....@gmail.com <eric.fet...@gmail.com>
wrote:

> Here's what I did:
>
> yum update jenkins
>
> Here's what's happening trying to get version info after upgrade.  Also
> won't start with systemctl start jenkins.
>
> [root@nd645bd001 ~]# /bin/jenkins -version
> Sep 14, 2022 10:56:24 AM executable.Main verifyJavaVersion
> SEVERE: Running with Java class version 52, which is older than the
> Minimum required version 55. See https://jenkins.io/redirect/java-support/
> java.lang.UnsupportedClassVersionError: 52.0
>         at executable.Main.verifyJavaVersion(Main.java:145)
>         at executable.Main.main(Main.java:109)
>
> Jenkins requires Java versions [17, 11] but you are running with Java 1.8
> from /usr/lib/jvm/java-1.8.0-openjdk-1.8.0.342.b07-1.el7_9.x86_64/jre
> java.lang.UnsupportedClassVersionError: 52.0
>         at executable.Main.verifyJavaVersion(Main.java:145)
>         at executable.Main.main(Main.java:109)
>
> Seems I need to upgrade java, but jenkins doesn't control java.  Please
> advise.  Should I just yum update java?
>
> Thanks,
> Eric
>
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