Unit tests don't work with java 11

[fwilhe]

To reproduce:

Try both the same thing in maven:3-jdk-8 and maven:3-jdk-11 docker image respectively:

Clone this repo, cd into, run mvn verify

If using java 8, it works.

If using java 11 you'll get loads of errors like

[ERROR] /jenkins-library/src/com/sap/piper/MapUtils.groovy:[3,7] 2849. ERROR in /jenkins-library/src/com/sap/piper/MapUtils.groovy (at line 3)
[ERROR] 	class MapUtils implements Serializable {
[ERROR] 	      ^^^^^^^^

[fwilhe]

Maybe this can be easily fixed by updating some dependencies in the pom.

[github-actions]

Thank you for your contribution! This issue is stale because it has been open 60 days with no activity. In order to keep it open, please remove stale label or add a comment within the next 10 days. If you need a Piper team member to remove the stale label make sure to add @SAP/jenkins-library-team to your comment.

[github-actions]

Issue got stale and no further activity happened. It has automatically been closed. Please re-open in case you still consider it relevant.