I download the https://github.com/jenkinsci/gerrit-trigger-plugin code.

revision is  "* 34313a6e - Merge pull request #382 from eryksz/fix_synchronisation ? Robert Sandell (HEAD -> master, origin/master, origin/HEAD) - (5 days ago)" ,

compile cmd is : ~/opt/apache-maven-3.5.4/bin/mvn -DskipTests=true   package hpi:run

but I found  this issue:  gerrit trigger parameters description show 'null' on the web

I only modify pom.xml file so it can compile success on my local:

• <jenkins.version>1.609.3</jenkins.version>
  + <jenkins.version>2.138.2</jenkins.version>

• <java.level>6</java.level>
  + <java.level>8</java.level>