We have pipeline-utility-steps plugin installed, and we use it to parse CSV files.

54749 Mar 10  2023 plugins/pipeline-utility-steps/WEB-INF/lib/commons-csv-1.10.0.jar

Recently, builds started breaking with:

java.lang.ClassCastException: class org.jenkinsci.plugins.pipeline.utility.steps.csv.ReadCSVStep.setFormat() expects class org.apache.commons.csv.CSVFormat but received class org.apache.commons.csv.CSVFormat

In addition, there also were two requests for Script Approval on csv-related methods that have been approved a long time ago and working for a long time.

After investigation, it turned out that another plugin that was installed recently (Performance) also has this:

54749 May  3 08:51 plugins/performance/WEB-INF/lib/commons-csv-1.10.0.jar

The both files are the same:

9b3be74e726a151524bf31ec293ff285  plugins/pipeline-utility-steps/WEB-INF/lib/commons-csv-1.10.0.jar
9b3be74e726a151524bf31ec293ff285  plugins/performance/WEB-INF/lib/commons-csv-1.10.0.jar

Assumption is that Performance's jar file is loaded before the Utility-steps jar file.

Issue was mitigated for now by removing Performance plugin.