Jenkinsfile - deploying to environments depending on the choice param

Jenkinsfile

// Requires:
// https://wiki.jenkins-ci.org/display/JENKINS/Deploy+Plugin
pipeline {
    agent {
      label "master"
    }

    parameters {
      choice(name: 'ENV', choices: ['DEV', 'TEST'], description: 'Select environment to deploy to')
      gitParameter name: 'TAG', type: 'PT_BRANCH_TAG', sortMode: 'DESCENDING_SMART', defaultValue: 'develop'
    }

    environment {
      CI = 'true'
      TOMCAT_DEV = 'https://tomcat1/manager/text'
      TOMCAT_TEST = 'https://tomcat2/manager/text'
    }

    options {
      disableConcurrentBuilds()
      timestamps()
    }

    stages {

         stage('Build') {
             steps {
               checkout([$class: 'GitSCM',
                         branches: [[name: "${params.TAG}"]],
                         doGenerateSubmoduleConfigurations: false,
                         extensions: [],
                         gitTool: 'Default',
                         submoduleCfg: [],
                         userRemoteConfigs: [[credentialsId: 'bitbucket_svc', url: 'git@<account>.bitbucket.org:<account>/<repo>.git']]
                       ])

                 sh 'mvn -B -DskipTests clean package'
             }
        } // end of build

        stage('Deploy') {

            steps {
                script {
                 if (params.ENV == 'DEV'){
                    env.TOMCAT_URL = env.TOMCAT_DEV
                 }
                 if (params.ENV == 'TEST'){
                    env.TOMCAT_URL = env.TOMCAT_TEST
                 }
                  echo "Deploying TAG: $env.TAG to: $env.TOMCAT_URL"
                }

                deploy adapters: [tomcat8(credentialsId: 'tomcat-dev', path: '', url: "${TOMCAT_URL}" )], contextPath: '/', onFailure: false, war: 'target/ROOT.war'
            }

        } // end of deploy


    } // end of stages

} // end of pipeline