Jenkinsfile: java.lang.NoSuchMethodError: No such DSL method 'agent' found among steps

[Adrian Wyssmann]

I have the following shared-library file defaultCiPipelineGeneric.groovy

def call(body) {

    // evaluate the body block, and collect configuration into the object

    def pipelineParams= [:]

    body.resolveStrategy = Closure.DELEGATE_FIRST

    body.delegate = pipelineParams

    body()

    pipelineParams = initializePipeline(pipelineParams, pipelineParams.buildType)

    pipeline {

        agent {

            label pipelineParams.nodes

        }

    ...

The pipeline is then uses as follows (e.g. in jenkins-pipeline-demo-generic):

library identifier: "pipeline-helper@master"

defaultCiPipelineGeneric {

    nodes               = 'windows-test'

    buildScript         = 'build.groovy'

}

That actually works fine. Now If i introduce additional methods like this:

def call(body) {

    this.call(body, null)

}

def call(body, buildFunction) {

    this.call(body, null, null)

}

def call(body, buildFunction, deployFunction) {

    // evaluate the body block, and collect configuration into the object

    def pipelineParams= [:]

    body.resolveStrategy = Closure.DELEGATE_FIRST

    body.delegate = pipelineParams

    body()

    pipelineParams = initializePipeline(pipelineParams, pipelineParams.buildType)

    pipeline {

        agent {

            label pipelineParams.nodes

        }

This fails with java.lang.NoSuchMethodError: No such DSL method 'agent' found among steps

Why does that not work?