In code that attempts to publish to artifactory using gradle I can't set the usesPlugin property like:
def rtGradle = Artifactory.newGradleBuild()
rtGradle.tool = "Gradle_2_14_1"
rtGradle.setUsesPlugin(true)
causes: org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: unclassified method org.jfrog.hudson.pipeline.types.GradleBuild setUsesPlugin java.lang.Boolean

Which is @Whitelisted according to:
https://github.com/jenkinsci/artifactory-plugin/blob/artifactory-2.8.1/src/main/java/org/jfrog/hudson/pipeline/types/deployers/GradleDeployer.java#L46

The documented way to set this boolean is:
rtGradle.usesPlugin = true
but that causes: org.jenkinsci.plugins.scriptsecurity.sandbox.RejectedAccessException: unclassified field org.jfrog.hudson.pipeline.types.GradleBuild usesPlugin

My /scriptApproval/ shows nothing to approve.