println in “call” method of “vars/foo.groovy” works, but not in method in class

Question

I\'m iterating through building a Jenkins pipeline shared library, so my Jenkinsfile is a little cleaner.

I\'m using the following page for guidance: https://jenkins

Answer 1

I did some digging and found this issue, https://issues.jenkins-ci.org/browse/JENKINS-41953, basically in normal pipeline script println is aliased to echo step. But when you're in a class, e.g. outside of the pipeline CPS, then the echo step isn't available and the println is ignored (since, as I understand it, there is no logger available).

What you can do is to propagate the script environment into your class methods using a variable and call echo through the variable (found solution in this thread). Like this:

class A {
    Script script;
    public void a() {
        script.echo("Hello")
    }
}
def a = new A(script:this)
echo "Calling A.a()"
a.a()

outputs:

Started by user jon
[Pipeline] echo
Calling A.a()
[Pipeline] echo
Hello
[Pipeline] End of Pipeline
Finished: SUCCESS

Which is what we want. For comparison, here is without propagation:

class A {
    public void a() {
        println "Hello"
    }
}
def a = new A()
echo "Calling A.a()"
a.a()

Gives:

Started by user jon
[Pipeline] echo
Calling A.a()
[Pipeline] End of Pipeline
Finished: SUCCESS