This blog leads me to a workaround to edit the usage of source:jar from the superpom.

Code changed in jenkins
User: Jesse Glick
Path:
pom.xml
http://jenkins-ci.org/commit/pom/2ad60fbf2adcee40636cc522cc000a20c2302c35
Log:
JENKINS-51247 Always use source:jar, not source:jar-no-fork.

Code changed in jenkins
User: Jesse Glick
Path:
pom.xml
http://jenkins-ci.org/commit/pom/c58c0c2a4753229a16284ffc9bf83385f6cb6b77
Log:
Merge pull request #25 from jglick/flatten-JENKINS-51247-source-fork

JENKINS-51247 Always use source:jar-no-fork, not source:jar

Compare: https://github.com/jenkinsci/pom/compare/4268dbd8740f...c58c0c2a4753
*NOTE:* This service been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

Functionality will be removed from GitHub.com on January 31st, 2019.

Code changed in jenkins
User: Jesse Glick
Path:
pom.xml
http://jenkins-ci.org/commit/plugin-pom/d535a304c6df0a8b008e833b61b9e9ff496d4ac7
Log:
JENKINS-51247 Always use source:jar, not source:jar-no-fork.

Code changed in jenkins
User: Jesse Glick
Path:
pom.xml
http://jenkins-ci.org/commit/plugin-pom/832ee403ce0043c6101e00c4adb9a0e7c3e8eb19
Log:
Merge pull request #107 from jglick/flatten-JENKINS-51247-source-fork

JENKINS-51247 Always use source:jar-no-fork, not source:jar

Compare: https://github.com/jenkinsci/plugin-pom/compare/6772c3cbaf8b...832ee403ce00
*NOTE:* This service been marked for deprecation: https://developer.github.com/changes/2018-04-25-github-services-deprecation/

Functionality will be removed from GitHub.com on January 31st, 2019.