Jenkins Pipeline : How can I pass a map obtained from readProperties to withEnv ?

[JL 6BerYeti]

Dear All,

I am trying to setup (many) environment variables for a set of stages
within a pipeline by reading a property file and then passing the result to
withEnv.
As far as my understanding is correct, I thought that withEnv waits for a
map, and readProperties returrns a map.
So, I try this :
def localProps=[:]
localProps=["moduleName=Communicator","versionNbr=1.0"]
def pipeProps=readProperties([
defaults : localProps,
file : "Pipeline/lib/tutoFile.properties"
])
echo "${pipeProps}"
withEnv(pipeProps) {
... pipeline stages
}

I am sure that the file is read within pipePros.
But the withEnv step fails with the following error :

java.lang.UnsupportedOperationException: must specify $class with an implementation of interface java.util.List at org.jenkinsci.plugins.structs.describable.DescribableModel.resolveClass(DescribableModel.java:442) at org.jenkinsci.plugins.structs.describable.DescribableModel.coerce(DescribableModel.java:371) at org.jenkinsci.plugins.structs.describable.DescribableModel.buildArguments(DescribableModel.java:313) at org.jenkinsci.plugins.structs.describable.DescribableModel.instantiate(DescribableModel.java:257) at org.jenkinsci.plugins.workflow.steps.StepDescriptor.newInstance(StepDescriptor.java:194) at org.jenkinsci.plugins.workflow.cps.DSL.invokeStep(DSL.java:181) at org.jenkinsci.plugins.workflow.cps.DSL.invokeMethod(DSL.java:126) at org.jenkinsci.plugins.workflow.cps.CpsScript.invokeMethod(CpsScript.java:108)

I don't understand what is wrong in the code (as you can imagine, I am not a groovy guru...), and I'd like to know how to get out of there.

Thanks for your help.
J-L

[thomo5000]

This question is a top search result on Google so I figure it's worth a late
reply.

readProperties returns a map and withEnv expects a list so you'll need to

def map = readProperties file:'env.properties'
def properties = map.collect { key, value -> return key+'='+value }
withEnv(properties)

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