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Upgrading to Jenkins LTS 2.332.x

Each section covers the upgrade from the previous LTS release, the section on 2.332.1 covers the upgrade from 2.319.3.

Upgrading to Jenkins 2.332.3

Log messages discarded under memory pressure

As of 2.332.1, log messages are discarded when the Java Virtual Machine (JVM) is under memory pressure. As of 2.332.3, such discarded messages appear in the Log Recorder page as <discarded>. To retain such log messages, alleviate memory pressure by increasing the Java heap size with e.g. the -Xmx Java flag. Alternatively, install Support Core to write these log messages to disk, where they are not subject to eviction.

Upgrading to Jenkins 2.332.2

No notable changes requiring upgrade notes.

Upgrading to Jenkins 2.332.1

Linux installation packages use systemd

Linux installation packages provided by the Jenkins project now use the Linux system and service manager (systemd) to manage the Jenkins service and its configuration. Existing installations that use the Debian/Ubuntu deb package format, the Red Hat rpm package format, and the SUSE rpm package format will use systemd when they upgrade to Jenkins 2.332.1.

The upgrade process reads the existing settings from the operating system specific System V init configuration files and writes those settings into a systemd override file for the Jenkins service.

After the upgrade process is complete, the system-level configuration settings are managed with the command:

# systemctl edit jenkins

See the Managing systemd services page for more details of systemd administration. See the blog post for more details about the migration.

If you find a regression, please file a bug report in Jira. When reporting an issue, include the following information:

  1. Use the core component.

  2. Provide the name, version, and architecture of the Linux distribution you are using (e.g., Ubuntu 20.04.4 LTS x86_64).

  3. Provide the contents of the old System V init(8) configuration in /etc/{default,sysconfig}/jenkins, sanitized as necessary.

  4. Provide the contents of the systemd(1) drop-in unit in /etc/systemd/system/jenkins.service.d/override.conf, sanitized as necessary.

  5. Provide steps to reproduce the issue from scratch on a minimal Jenkins installation; the scenario should fail when the steps are followed on Jenkins 2.335 or later and pass when the steps are followed on Jenkins 2.334 or earlier.

Guava upgraded

The Guava library from Google is bundled in Jenkins core. Jenkins has upgraded the Guava library from 11.0.1 (released on January 9, 2012) to 31.0.1 (released on September 27, 2021). Plugins have already been prepared to support the new version of Guava in JEP-233. Use the Plugin Manager to upgrade all plugins before and after upgrading to Jenkins 2.332.1. See the Guava upgrade blog post for more details.

JRuby removed

JRuby support has been removed from Jenkins core. A small number of JRuby-based plugins are affected. See the JRuby removal blog post for migration notes.

ASM 5 removed

A repackaged version of ObjectWebASM 5 and the upstream version of ASM were both included in Jenkins core. Jenkins core no longer provides the repackaged version of ASM 5. Users of SCM API must upgrade SCM API to the latest version prior to upgrading Jenkins. Plugins that use the repackaged version of ASM 5 must be updated to use the upstream version of ASM instead.

JNDI setting of Jenkins home directory removed

Support for setting the Jenkins home directory via Java Naming and Directory Interface (JNDI) has been removed. The Jenkins home directory may still be set using the -DJENKINS_HOME Java system property or the JENKINS_HOME environment variable.

Users who load jenkins.war via a servlet container like Tomcat should refer to their servlet container’s documentation for information on how to customize Java system properties or environment variables.

For example, the Tomcat servlet container accepts custom Java system properties in the CATALINA_OPTS environment variable.

Windows batch file and PowerShell script encoding

In traditional job types, the scripts used in Windows batch file and PowerShell steps are encoded in the JVM’s default encoding. In previous releases, characters in these scripts that could not be encoded in the JVM’s default encoding were silently converted to ? (question mark) characters. In the current release, a script that contains characters that cannot be encoded in the JVM’s default encoding will result in an explicit and intentional failure of the batch file or PowerShell step.

Users who encounter such failures should either rewrite the script to be compatible with the JVM’s default encoding, or they should change the JVM’s default encoding to be compatible with the script. In most cases, the solution is to change the JVM’s default encoding from Windows-1252 to UTF-8 by setting the -Dfile.encoding=UTF-8 Java system property on the JVM of the node that executes the script.

Log messages discarded under memory pressure

As of 2.332.1, log messages are discarded when the Java Virtual Machine (JVM) is under memory pressure. Such discarded log messages are not displayed in the Log Recorder page. To retain such log messages, alleviate memory pressure by increasing the Java heap size with e.g. the -Xmx Java flag. Alternatively, install Support Core to write these log messages to disk, where they are not subject to eviction.