Modify env.BRANCH_NAME variable with branch-env.BRANCH_NAME in jenkinsfile for a multibranch pipeline project - jenkins

Question

I have created a multibranch pipeline project and thus created jenkinsfile and put that in dev branch.
In one of the stage, I have to run mvn sonar:sonar -Dsonar.scm.branch=branch-${env.BRANCH_NAME} but it's giving error as bad substitution branch-${env.BRANCH_NAME}.
I need branch-${env.BRANCH_NAME} as a branch-name so that at sonar i can see branch-dev at branches section in sonar dashboard.
if i use mvn sonar:sonar -Dsonar.scm.branch=env.BRANCH_NAME then it provides output but it will act as short-lived branch in sonar. but at sonar we want branch as long-lived branch.
!/usr/bin/env groovy
pipeline {
agent { label 'ol73_slave-jdk8u192-git' }
options {
timestamps()
timeout(time: 2, unit: 'HOURS')
buildDiscarder(logRotator(numToKeepStr: '10'))
disableConcurrentBuilds()
}
stages {
stage('Checkout') {
steps {
checkout scm
}
}
stage('Unit Test and Code Scan') {
steps {
echo "*****JUnit Tests, JaCoCo Code Coverage, & SonarQube Code Qualiy Scan*****"
withMaven(jdk: 'jdk8_u192', maven: 'maven-3.3.9', mavenSettingsConfig: '79ecf9bd-8cbc-4d5e-b7d1-200241e16b52') {
sh '''
cd DARC
mvn clean package sonar:sonar -Dsonar.host.url=***** -Dsonar.login=******* -Dsonar.exclusions=file:**/src/test/** -B -Pcoverage -Dsonar.branch.name=branch-${env.BRANCH_NAME}
'''
}
}
}
}
}

Answer 1

In groovy Strings are encapsulated in single quotes '' and GStrings in double quotes ""
In order to do interpolation you need to be using GStrings. In your example, this should simply be
sh """
cd DARC
mvn clean package sonar:sonar -Dsonar.host.url=***** -Dsonar.login=******* -Dsonar.exclusions=file:**/src/test/** -B -Pcoverage -Dsonar.branch.name=branch-${env.BRANCH_NAME}
"""