How to specify JDK version in Jenkinsfile pipeline script - jenkins

Question

I have a pipeline script to deploy applications to server. I'm building project using maven, I want Jenkins to use specified JDK version for building the project. My pipeline script looks like this:
pipeline {
agent any
tools {
// Install the Maven version configured as "M3" and add it to the path.
maven "Maven 3.6.3"
}
stages {
stage('Build') {
steps {
// Run Maven on a Unix agent.
sh "mvn clean package -DskipTests=true -U"
}
post {
// If Maven was able to run the tests, even if some of the test
// failed, record the test results and archive the jar file.
success {
archiveArtifacts "**/${war}"
}
}
}
stage('Deploy EQM Instance 1') {
steps {
sshagent(credentials: ['credentials']) {
sh "echo 1"
sh "echo Initializing deployment to Instance 1"
sh "scp target/${war} ${bastionHost}:/home/opc"
sh "echo 2.1"
sh "echo Uploaded war file to bastion instance"
sh "scp ${bastionHost}:/home/opc/${war} opc#${instanceDns}:/home/opc"
sh "echo 3.2"
sh "echo Uploaded war file from bastion instance to Instance 1 ${instanceDns}"
sh "echo Undeploying old war file"
sh "ssh ${bastionHost} -tt ssh opc#${instanceDns} sudo rm /opt/tomcat/webapps/${war}"
sh "echo 4.2.2"
sh "ssh ${bastionHost} -tt ssh opc#${instanceDns} sudo chown tomcat:tomcat -R ${war}"
sh "echo Deploying new war file"
sh "ssh ${bastionHost} -tt ssh opc#${instanceDns} sudo mv ${war} /opt/tomcat/webapps/"
sh "echo 4.3"
}
}
}
}
There are other already configured on Jenkins, I don't want to disturb them. So I want to specify JDK version in desired job configuration.