Introduction The Jenkins project is committed to delivering a world-class platform experience for end users and developers alike. At the core of this experience is Java, an object-oriented programming language with a cross-platform runtime in the form of the Java virtual machine (JVM). Since its inception, the Jenkins project has been a major consumer of Java, distributing over 1,800 plugins to an installed base of over 300,000...

Beginning with Jenkins 2.335 and Jenkins 2.332.1, the Jenkins project is migrating from System V init(8) to systemd(1) in its official Debian, Red Hat, and openSUSE packages. The official Docker image and Helm chart remain unchanged. For up-to-date information, refer to the Managing systemd services page in the documentation. Background Beginning in 2008, the Jenkins (then Hudson) project has delivered Linux OS installation packages for Debian (and derivatives),...

Please refer to the Java requirements documentation for up-to-date details on how to run Jenkins on Java 17. Jenkins, one of the leading open-source automation servers, does not yet officially support Java 17. On September 14, 2021, OpenJDK 17 was released. This is a Long-Term-Support (LTS) release, and it will stay around for years. The Jenkins project is eager to offer full support of this version. Over the last...

Summary Jenkins bundles Guava, a core Java library from Google. Beginning with Jenkins 2.320 (released on November 10, 2021), 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 2.320. Motivation Many security-conscious organizations...

Keeping up with our goal to clean up some of the technical debt inside Jenkins Core and reduce the maintenance overheads, we are happy to report we were able to remove a long-deprecated Apache Commons Digester library. Jenkins Core does not depend anymore on Apache Commons Digester v.2.1, a version that has been released in 2010. Some plugins will require update to operate properly after the...

Recently we have selected Jenkins 2.263 as a new baseline for the LTS release line, with ETA in December 2020. It allows delivering significant and in some cases breaking changes which have been previously on hold. Beginning with the Jenkins 2.264 release on October 27, 2020, we’ve entered a period where the Jenkins weekly releases will include more significant changes than usual. That period of more significant...

Cleaning up technical debt is a perennial topic among Jenkins core developers, and one of the most visible issues is the use of obsolete and/or forked third-party libraries. In a world where Dependabot is offering updates to libraries released just hours before, it is unpleasant to be working with dependencies that are many years old. Since large organizations in particular are unhappy to install software using obsolete or...

I am happy to report that JEP-222 has landed in Jenkins weeklies, starting in 2.217. This improvement brings experimental WebSocket support to Jenkins, available when connecting inbound agents or when running the CLI. The WebSocket protocol allows bidirectional, streaming communication over an HTTP(S) port. While many users of Jenkins could benefit, implementing this system was particularly important for CloudBees because of how CloudBees Core on modern cloud platforms (i.e., running on Kubernetes)...

Half a year ago we delivered a security fix for Jenkins that had the potential to break the entire Jenkins UI. We needed to change how Jenkins, through the Stapler web framework, handled HTTP requests, tightening the rules around what requests would be processed by Jenkins. In the six months since, we didn’t receive notable reports of problems resulting from this change, and it’s thanks to...

This is a joint blog post prepared by the Java 11 Support Team: Adrien Lecharpentier, Ashton Treadway, Baptiste Mathus, Jenn Briden, Kevin Earls, María Isabel Vilacides, Mark Waite, Ramón León and Oleg Nenashev. We have worked hard for this and it’s now here. We are thrilled to announce full support for Java 11 in Jenkins starting from Jenkins 2.164 (released on Feb 10, 2019) and LTS...