Description of problem: Using a stock Jenkins installed via "dnf install jenkins", the Github plugins won't work due to a missing method that should be provided by the guava library. The version that is shipped with the official Jenkins WAR is 11.0, whereas the version provided by the Jenkins in Fedora is 18.0. Version-Release number of selected component (if applicable): How reproducible: Always Steps to Reproduce: 1. Install Jenkins via dnf install jenkins 2. Install the GitHub plugin 3. On the Jenkins configuration page, hit "Verify credentials". An exception is shown. Actual results: An exception is shown after clicking on "ERROR" Expected results: Unauthorized request (401), if no credentials have been entered, or success if credentials were entered. Additional info: As a workaround, one can download download Guava 11.0 and install it under /usr/share/java/ , and then: rm /usr/share/jenkins/webroot/WEB-INF/lib/guava.jar ln -s /usr/share/java/guava-11.0.1.jar /usr/share/jenkins/webroot/WEB-INF/lib/guava.jar The easiest is to download the Jenkins WAR from jenkins-ci.org and use the guava JAR from there.
Thanks for the bug report Juraci. Guava is known offender in breaking backward compatibility [1]. I'll see what can be done here. [1]: https://github.com/jenkinsci/jenkins/commit/cfe4b82994f261fe7623becfd2c7505679284026
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