Thanks Dirk, but that does not solve my problem, I'm still stuck.
I think that my question boils down to why the multi-line sh command below
does not work?
According to
https://www.jenkins.io/doc/book/pipeline/jenkinsfile/#string-interpolation
single-quoted strings should be interpolated by Jenkins (instead of using
Groovy string interpolation). I would assume this applies
to both variables (e.g. GEN_USR below) and method calls returning a string
(e.g. jdbcUrlNoData() below)?

withCredentials([usernamePassword(credentialsId:
'credentialsGenerateFromDb',
                           usernameVariable: 'GEN_USR',
                           passwordVariable: 'GEN_PASSWD')]) {
   String m2RepoIdentifier = "${env.BRANCH_NAME}_${env.BUILD_NUMBER}"

   withEnv(javaAndMavenEnvArray()) {
      sh '${JAVA_HOME}/bin/java -version' // single quotes - this works
fine!

      sh script: '''
            ${mvnCommand(m2RepoIdentifier)}\
             -f proj-reactor/pom.xml\
             -P GenerateStorables -DdeployAtEnd=true\
             -Dproj.build.generatefromdb.url=${jdbcUrlNoData()}\
             -Dproj.build.generatefromdb.user=${GEN_USR}\
             -Dproj.build.generatefromdb.password=${GEN_PASSWD}\
             clean ${mvnBuildGoal} pmd:pmd pmd:cpd\
      '''
   }
}

On Tue, Nov 17, 2020 at 2:06 PM 'Dirk Heinrichs' via Jenkins Users <
[email protected]> wrote:

> Am Dienstag, den 17.11.2020, 13:45 +0100 schrieb ST:
>
>  " '-Dproj.build.generatefromdb.user=${env.GEN_USR}'"
>
>
> Try with ${GEN_USR} inside shell scripts, not ${env.GEN_USR}.
>
> HTH...
>
> Dirk
>
> --
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> *Dirk Heinrichs*
> Senior Systems Engineer, Delivery Pipeline
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