jenkinsfile and sonarqube

Jenkinsfile

node {

   echo "======================================="
   echo "JENKINS_HOME = ${env.JENKINS_HOME}"
   echo "JOB_NAME = ${env.JOB_NAME}"
   echo "REPO_GIT = " + REPO_GIT
   echo "DEFAULT_GIT_BRANCH = "+ DEFAULT_GIT_BRANCH
   echo "SONAR_SERVER = "+ SONAR_SERVER
   echo "======================================="
   def sonarInstance=hudson.plugins.sonar.SonarInstallation.get(SONAR_SERVER).name;
   def sonarServerUrl=hudson.plugins.sonar.SonarInstallation.get(SONAR_SERVER).serverUrl;
   def sonarDatabaseUrl=hudson.plugins.sonar.SonarInstallation.get(SONAR_SERVER).databaseUrl;
   def sonarDatabaseLogin=hudson.plugins.sonar.SonarInstallation.get(SONAR_SERVER).databaseLogin;
   def sonarDatabasePassword=hudson.plugins.sonar.SonarInstallation.get(SONAR_SERVER).databasePassword;

   echo "sonarInstance: "+ sonarInstance
   echo "sonarServerUrl: "+ sonarServerUrl
   echo "sonarDatabaseUrl: "+ sonarDatabaseUrl

   stage 'Checkout'
   git url: REPO_GIT , branch: DEFAULT_GIT_BRANCH
   
   def mvnHome = tool 'M311'

   stage 'Build'
   // Run the maven build
   sh "${mvnHome}/bin/mvn org.jacoco:jacoco-maven-plugin:0.7.4.201502262128:prepare-agent clean verify -Dmaven.test.failure.ignore=true" 

   stage 'ccj-deps-matrix'
   sh "${mvnHome}/bin/mvn fr.generali.ccj.maven.plugin:ccj-deps-matrix:0.0.8:deps-matrix -DoutputPath=${env.JENKINS_HOME}/userContent/deps-matrix -DappName=${env.JOB_NAME}" 

   stage 'Sonar'
   sh '''
     GIT_BRANCH=`git rev-parse --abbrev-ref HEAD`
     SONAR_BRANCH=`printf '%s' $GIT_BRANCH | sed s/[^0-9a-zA-Z:_.\\-]/'_'/g`
     echo "GIT_BRANCH=${GIT_BRANCH}" > my-build-vars.properties
     echo "SONAR_BRANCH=${SONAR_BRANCH}" >> my-build-vars.properties
   '''    
   def props = getBuildProperties("my-build-vars.properties")
   echo "my-build-vars.properties=${props}"
   def sonarBranchParam = getSonarBranchParameter(props.getProperty('SONAR_BRANCH'))

   sh "${mvnHome}/bin/mvn sonar:sonar ${sonarBranchParam} -Dsonar.jdbc.url='${sonarDatabaseUrl}' -Dsonar.host.url=${sonarServerUrl} -Dsonar.jdbc.username=${sonarDatabaseLogin} -Dsonar.jdbc.password=${sonarDatabasePassword}"
}

def getSonarBranchParameter(branch) {
    sonarBranchParam = ""
     if ("develop".equals(branch)) {
        echo "branch is develop, sonar.branch not mandatory"
    } else {
        echo "branch is not develop"
        sonarBranchParam="-Dsonar.branch=" + branch
    }
   return sonarBranchParam
}

def Properties getBuildProperties(filename) {
    def properties = new Properties()
    properties.load(new StringReader(readFile(filename)))
    return properties
}