Building Java Code with Maven
- Maven is a software project management tool (build, dependency management tool)
- This is based on the concept of project object model (POM)
- Maven provides
- build
- test
- reports
- documentation
- releases
- Maven follows convention over configuration
| Item | Default |
|---|---|
| source code | ${basedir}/src/main/java |
| Resources | ${basedir}/src/main/resources |
| Tests | ${basedir}/src/test |
| Compile byte code | ${basedir}/target/classes |
| distributable (jar/war) | ${basedir}/target |
Installing Maven
- Ensure java is installed
#ubuntu
sudo apt update
sudo apt install openjdk-11-jdk -y
- Maven can be downloaded and installed manually Refer Here
- Now lets use apt
sudo apt install maven -y
mvn --version
* Now lets try to install maven using tar file
cd /tmp
wget https://dlcdn.apache.org/maven/maven-3/3.8.5/binaries/apache-maven-3.8.5-bin.tar.gz
tar -xvzf apache-maven-3.8.5-bin.tar.gz
sudo mv apache-maven-3.8.5 /opt/
- set the following environmental variables in /etc/profile.d/java.sh
export M2_HOME='/opt/apache-maven-3.8.5'
PATH="$M2_HOME/bin:$PATH"
export PATH
- Logout & Login
mvn --version
- The developers will create the pom.xml file, but we need to understand
- When building the java project,
- compile the code
- run the unit tests
- create a package
- In Maven we have goals/build phase
- compile => Creates .class files
- test => runs the unit tests and generates the reports. This will also try to compile
- package => creates the jar/war file. This will execute compile + test
- install
- deploy
- clean => remove the target folder
- Maven dowloads the dependencies by default from internet Refer Here
- Lets compile the spring petclinic
- Maven when it downloads the dependencies, uses the folder in
${HOME-DIR}\.m2 - We can combine goals
mvn clean package
mvn compile test package
- Exercise: Make the jenkins build any java project using
mvn package
