Unable to use the "when" closure to skip a stage (pipeline-model-definition-plugin)

[Roi Aldaag]

After updating the last pipeline plugin 2.5 and dependent plugins on latest Jenkins 2.45 we are unable to use the "when" closure:

we get the following error:

java.lang.NoSuchMethodError: No such DSL method 'when' found among steps [...]
	at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:149)

for a very simple pipeline in the inline pipeline editor (not in an external Jenkinsfile):

node {

   stage('1') { // for display purposes

   }

   stage('2') {

        when {

            //return false

        }

   }

   stage('3') {

   }

}

Does the last release of pipeline-model-definition-plugin 1.0 include the support for the "when" closure in a stage?

Thank you in advance,

Roi

[R. Tyler Croy]

(replies inline)

On Thu, 09 Feb 2017, Roi Aldaag wrote:

> for a very simple pipeline in the inline pipeline editor (not in an
> external Jenkinsfile):
>

> *node {*
> * stage('1') { // for display purposes*
>
> * }*
> * stage('2') {*
> * when {*
> * //return false*
> * }*
> * }*
> * stage('3') {*
>
> * }*
> *}*


This Jenkinsfile is _not_ a Declarative Pipeline but is instead using the
Scripted Pipeline syntax.

A Declarative Pipeline *must* have a `pipeline { }` outer block, and a number
of other required sections, and `when` is only applicable within Declarative.
Otherwise you can just use normal Groovy conditionals.

See this document for more: https://jenkins.io/doc/book/pipeline/syntax/

- R. Tyler Croy

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[Roi Aldaag]

Thanks Tyler for your prompt response!

Just to make it clear -  the "when" clause is NOT supported in the Scripted Pipeline syntax and is only supported in the Declarative Pipeline Jenkinsfile? 

Is that explained anywhere in the documentation? Aren't those scripts interpreted eventually by the same engine?

I am aware that the Declarative pipeline should start with the pipeline outer block. The code that I have posted was for a scripted pipeline and I have stated that in my original post.

Thanks,

Roi

[Baptiste Mathus]

"scripted" Pipeline simply uses typical programmatic "if" construct.

Declarative makes this more, well, declarative and is a bit different for readability purpose.

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