pipeline groovy - can somebody please explain why variable value passing is working like this?

[Jonathan Hodgson]

Ok, so having got my script working, I decided to move part of it into a shared library as per the section marked 

Define more structured DSL

here 

https://github.com/jenkinsci/workflow-cps-global-lib-plugin

But I'm getting what to me seems like very odd behaviour with the variables.

My primary jenkins code (on the server in the job configuration, not a jenkinsfile in this case), looks like this (after cutting it down to the minimum to test this phenomemon)

@Library('mylibrary')


echo buildparam_project.getClass().name
echo buildparam_project
def check = buildparam_project

utils = new gforce.utigforce.patchreader()


WpfCheckoutAndBuild {
    project = "${check} Project is ${buildparam_project}"
}

buildparam_project is a build parameter

meanwhile, the file vars/WpfCheckoutAndBuild.groovy looks like this

def call(body) {
    // evaluate the body block, and collect configuration into the object
    def buildparam = [:]
    body.resolveStrategy = Closure.DELEGATE_FIRST
    body.delegate = buildparam
    body()


    echo buildparam.project
}

The output I see, is

[Pipeline] echo java.lang.String 
[Pipeline] echo MyProject 
[Pipeline] echo MyProject Project is null 
[Pipeline] End of Pipeline Finished: SUCCESS

So buildparam_project can't be passed directly, I have to assign it to another variable first?

I assume this is something going on under the hood that I don't know about, Groovy can be very odd and Groovy under CPS considerably more so.

Could somebody explain it, and ideally give me a solution that doesn't require me to create copies of every build parameter (I'll do it if I have to, but it's messy)?

[Thomas Keller]

/sub

[Jonathan Hodgson]

I'm sorry, but am I supposed to know what that means?

On Monday, November 14, 2016 at 10:25:12 AM UTC, Thomas Keller wrote:

/sub

[Lee Meador]

I think he is saying to put the path part preceeding the file name inside the parentheses on the @Library annotation

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[Thomas Keller]

I'm just interested in this thread, so I'm subscribing by answering. Sorry for the confusion :)

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[James Jermany]

Did you every find a solution or come to understand why its like this?