Jenkins Won't start after latest ugrade

[eric....@gmail.com]

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

[Alex Earl]

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).

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[Mark Waite]

See https://www.jenkins.io/doc/administration/requirements/upgrade-java-guidelines/ for instructions and a video describing the steps

[Eric Fetzer]

Thanks for the response Mark.  I don't want to backgrade, so jenkins won't run.  Can you give me a clue as to where the filepath is to java in Jenkins.  Just upgrading didn't solve the problem and the vid is too slow for me.  He seems to talk a lot about working in the tool.  I'm command line RHEL 7.

Thanks,

Eric

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[Mark Waite]

On Wednesday, September 14, 2022 at 2:26:09 PM UTC-6 Eric Fetzer wrote:

Thanks for the response Mark.  I don't want to backgrade, so jenkins won't run.  Can you give me a clue as to where the filepath is to java in Jenkins.  Just upgrading didn't solve the problem and the vid is too slow for me.  He seems to talk a lot about working in the tool.  I'm command line RHEL 7.

I believe that the command you want is described on the Red Hat Customer Portal.

# alternatives --config java

Naturally, there are many different scenarios and complications where that command is the wrong choice.  For most people, the simplest choice is to switch the system path to Java and that is what alternatives will do.

If that is not what you prefer, then you can configure a specific Java path through

# systemctl edit jenkins

 

The Jenkins documentation includes a guide to managing services with systemd.

Mark Waite

[Mark Waite]

Yet another technique, quoting from the link that I included earlier:

> Make sure the default JVM is the newly installed version. If it is not, run systemctl edit jenkins and set either the JAVA_HOME environment variable or the JENKINS_JAVA_CMD environment variable

[Eric Fetzer]

Yep, it's correct but still won't start:

[root@nd645bd001 jenkins]# alternatives --config java

There is 1 program that provides 'java'.

  Selection    Command
-----------------------------------------------
*+ 1           java-11-openjdk.x86_64 (/usr/lib/jvm/java-11-openjdk-11.0.16.0.8-1.el7_9.x86_64/bin/java)

Here's the error in journalctl:

-- The start-up result is done.
Sep 14 15:40:01 nd645bd001 CROND[90879]: (root) CMD (/usr/lib64/sa/sa1 1 1)
Sep 14 15:40:01 nd645bd001 systemd[1]: Removed slice User Slice of root.
-- Subject: Unit user-0.slice has finished shutting down
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit user-0.slice has finished shutting down.
Sep 14 15:40:02 nd645bd001 goferd[1237]: [WARNING][pulp.agent.1c5e8577-7a00-4d79-b04f-b69dc63299ac] gofer.messaging.adapter.proton.reliability:54 - Connection amqps://ne001rhc001.fireness.gov:5647 disconnected: Condition('amqp:resource-l
[root@nd645bd001 jenkins]#

Appears that jenkins may be expecting systemd rather than systemctl???  Just guessing...  Thanks!

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[Eric Fetzer]

Sorry Mark, used to happening onto fixes in 2 minutes.  I'll put the 11 minutes into the vid.  Thanks for all the help!

On Wed, Sep 14, 2022 at 2:35 PM Mark Waite <mark.ea...@gmail.com> wrote:

Yet another technique, quoting from the link that I included earlier:

> Make sure the default JVM is the newly installed version. If it is not, run systemctl edit jenkins and set either the JAVA_HOME environment variable or the JENKINS_JAVA_CMD environment variable

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