Maven Build For DevOps

Check the version:

mvn --version
Apache Maven 3.9.9 (8e8579a9e76f7d015ee5ec7bfcdc97d260186937)
Maven home: /Users/anju/Downloads/apache-maven-3.9.9
Java version: 17.0.12, vendor: Oracle Corporation, runtime: /Library/Java/JavaVirtualMachines/graalvm-jdk-17.0.12+8.1/Contents/Home
Default locale: en_IN, platform encoding: UTF-8
OS name: "mac os x", version: "14.6.1", arch: "aarch64", family: "mac"

Create a dummy project using https://start.spring.io/ or below command:

mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.5 -DinteractiveMode=false

You will see something like this if project created successfully:

cd my-app
tree
.
├── pom.xml
└── src
    ├── main
    │   └── java
    │       └── com
    │           └── mycompany
    │               └── app
    │                   └── App.java
    └── test
        └── java
            └── com
                └── mycompany
                    └── app
                        └── AppTest.java

12 directories, 3 files

What did I just do?

You executed the Maven goal archetype:generate, and passed in various parameters to that goal. The prefix archetype is the plugin that provides the goal. If you are familiar with Ant, you may conceive of this as similar to a task. This archetype:generate goal created a simple project based upon a maven-archetype-quickstart archetype. Suffice it to say for now that a plugin is a collection of goals with a general common purpose. For example the jboss-maven-plugin, whose purpose is “deal with various jboss items”.

Build the Project

mvn package
[INFO] Scanning for projects...
[INFO] 
[INFO] ----------------------< com.mycompany.app:my-app >----------------------
[INFO] Building my-app 1.0-SNAPSHOT
[INFO]   from pom.xml
[INFO] --------------------------------[ jar ]---------------------------------
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/3.3.1/maven-resources-plugin-3.3.1.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/3.3.1/maven-resources-plugin-3.3.1.pom (8.2 kB at 37 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-plugins/39/maven-plugins-39.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-plugins/39/maven-plugins-39.pom (8.1 kB at 300 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/3.3.1/maven-resources-plugin-3.3.1.jar
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-resources-plugin/3.3.1/maven-resources-plugin-3.3.1.jar (31 kB at 720 kB/s)
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.13.0/maven-compiler-plugin-3.13.0.pom
Downloaded from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-compiler-plugin/3.13.0/maven-compiler-plugin-3.13.0.pom (10 kB at 454 kB/s)
......
......
......
......
[INFO] Building jar: /Users/anju/my-app/target/my-app-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  02:48 min
[INFO] Finished at: 2024-09-27T14:41:21+05:30
[INFO] ------------------------------------------------------------------------

Newly created compiled and packaged files:

.
├── pom.xml
├── src
│   ├── main
│   │   └── java
│   │       └── com
│   │           └── mycompany
│   │               └── app
│   │                   └── App.java
│   └── test
│       └── java
│           └── com
│               └── mycompany
│                   └── app
│                       └── AppTest.java
└── target
    ├── classes
    │   └── com
    │       └── mycompany
    │           └── app
    │               └── App.class
    ├── generated-sources
    │   └── annotations
    ├── generated-test-sources
    │   └── test-annotations
    ├── maven-archiver
    │   └── pom.properties
    ├── maven-status
    │   └── maven-compiler-plugin
    │       ├── compile
    │       │   └── default-compile
    │       │       ├── createdFiles.lst
    │       │       └── inputFiles.lst
    │       └── testCompile
    │           └── default-testCompile
    │               ├── createdFiles.lst
    │               └── inputFiles.lst
    ├── my-app-1.0-SNAPSHOT.jar
    ├── surefire-reports
    │   ├── TEST-com.mycompany.app.AppTest.xml
    │   └── com.mycompany.app.AppTest.txt
    └── test-classes
        └── com
            └── mycompany
                └── app
                    └── AppTest.class

33 directories, 13 files

Introduction to the Standard Directory Layout

Run the compiled and packaged jar file

java -cp target/my-app-1.0-SNAPSHOT.jar com.mycompany.app.App
Hello World!