DevOps Classroom notes 11/Sep/2025

Building, Unit Testing and packaging Java code

• We will build the java code using maven
  • compile:
    • we will check the target folder to find .class files
  • test:
    • we will check the target folder for test results
  • package
    • we will check the target folder for package
• Springpetclinic
• To build this lets install jdk 21 and maven 3.9.11
• jdk frameworks
  • openjdk
  • oracle jdk
  • amazon correto
  • eclpise temurin
• Lets use eclipse temurin

sudo apt update
sudo apt install -y wget apt-transport-https
echo "deb [signed-by=/etc/apt/keyrings/adoptium.asc] https://packages.adoptium.net/artifactory/deb $(awk -F= '/^VERSION_CODENAME/{print $2}' /etc/os-release) main" | sudo tee /etc/apt/sources.list.d/adoptium.list
sudo mkdir -p /etc/apt/keyrings
wget -O - https://packages.adoptium.net/artifactory/api/gpg/key/public | sudo tee /etc/apt/keyrings/adoptium.asc
sudo apt update
sudo apt install -y temurin-21-jdk
java --version

• Now lets install maven

wget https://dlcdn.apache.org/maven/maven-3/3.9.11/binaries/apache-maven-3.9.11-bin.tar.gz -P /tmp
sudo tar -xf /tmp/apache-maven-3.9.11-bin.tar.gz -C /opt
sudo ln -sfn /opt/apache-maven-3.9.11 /opt/maven

• Now create a profile script for maven at /etc/profile.d/maven.sh with the following content

export JAVA_HOME=/usr/lib/jvm/temurin-21-jdk-amd64
export M2_HOME=/opt/maven
export MAVEN_HOME=/opt/maven
export PATH=${M2_HOME}/bin:${PATH}

• Execute

source /etc/profile.d/maven.sh
mvn --version

• Lets clone the code

git clone https://github.com/dummyrepos/spring-petclinic-sep25.git
cd spring-petclinic-sep25

• Now compile the code

mvn compile

• Now clean and run the tests

mvn clean test

• Now clean and create the package

mvn clean package

• Github Actions free plan for Github Runners

Feature	Limit under Free plan (public repos)
Free minutes / usage cost	Usage is free & unlimited for workflows using standard GitHub-hosted runners on public repositories. (GitHub Docs)
Concurrent jobs (total, non-macOS)	20 concurrent jobs on non-macOS runners. (GitHub Docs)
Concurrent macOS jobs	5 concurrent macOS jobs. (GitHub Docs)
Job execution time limit	Each job can run up to 6 hours before being terminated. (GitHub Docs)
Workflow run queue limits / event trigger rates	e.g. up to 1,500 triggering events per 10 seconds per repository, up to 500 workflow runs queued per 10 seconds. (GitHub Docs)
Workflow run time / gate approval wait time	A workflow run may run for up to 35 days, and gate approval can wait up to 30 days. (GitHub Docs)

• Installing softwares in Github hosted runners
  • search for setup actions in market place
• Refer Here for pull request workflow created in github actions
• Now create a pull request to test the workflow
• Lets update the workflow to use actions from market place