[FIXED] Why is Jenkins pointing to old JDK even after configuring openjdk-17.0.5 in tools?

Issue

I am running Jenkins 2.345 as a container in docker. The host OS is ubuntu 20.04 LTS. Now, I want to compile a maven project that requires Java 17, for that I have installed JDK 17 in Jenkins as a tool. Now to verify whether the new JDK is working or not I am running the following pipeline.

Pipeline Script

pipeline 
{
    agent any

    tools
    {
        jdk 'openjdk-17.0.5'
        maven 'maven'
    }

    stages {
        stage('Example') {
            steps {
                sh '''
                    env | grep -e PATH -e JAVA_HOME
                    which java
                    java -version
                    mvn -v
                '''
            }
        }
    }
}

After building the pipeline I got the following output log.

+ grep -e PATH -e JAVA_HOME
+ env
LD_LIBRARY_PATH=/opt/java/openjdk/lib/server:/opt/java/openjdk/lib:/opt/java/openjdk/../lib
PATH=/var/jenkins_home/tools/hudson.model.JDK/openjdk-17.0.5/openjdk-17.0.5/bin:/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/maven/bin:/var/jenkins_home/tools/hudson.model.JDK/openjdk-17.0.5/openjdk-17.0.5/bin:/var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/maven/bin:/opt/java/openjdk/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
JAVA_HOME=/var/jenkins_home/tools/hudson.model.JDK/openjdk-17.0.5/openjdk-17.0.5
+ which java
/opt/java/openjdk/bin/java
+ java -version
openjdk version "11.0.15" 2022-04-19
OpenJDK Runtime Environment Temurin-11.0.15+10 (build 11.0.15+10)
OpenJDK 64-Bit Server VM Temurin-11.0.15+10 (build 11.0.15+10, mixed mode)
+ mvn -v
The JAVA_HOME environment variable is not defined correctly,
this environment variable is needed to run this program.

So even if JAVA_HOME value is updated but still Jenkins can only identify the java within /opt/java/openjdk/bin which was the default setting.

So can anyone identify what's wrong with Jenkins and why this problem is occurring?

Solution

Just configure jenkins agents in docker and use any docker image containing java 17 as agent. How to make it - please look here https://www.youtube.com/watch?v=ymI02j-hqpU

Answered By - Dmitriy Tarasevich
Answer Checked By - David Marino (JavaFixing Volunteer)