Programmatically trigger a pipeline run (with custom data) in Jenkins

trigger_jenkins_pipeline_programmatically.java

import jenkins.model.*;

import hudson.model.Job;
import hudson.model.Run;
import hudson.model.queue.QueueTaskFuture;

import org.jenkinsci.plugins.workflow.cps.replay.ReplayAction;

String text = "node('some-node') { echo 'hi'; }"

Job test_job = Jenkins.getInstance().getItemByFullName("pipeline-job-name", hudson.model.Job);
ReplayAction action = test_job.getLastBuild().getAction(ReplayAction.class)
QueueTaskFuture<? extends Run> f = action.run(text, action.getOriginalLoadedScripts())
Run b = f.waitForStart()
println "Started job"
while (b.isBuilding()) {
	Thread.sleep(1000);
}
println "Job completed"
b.delete()