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Maven Basics

How to add third-party libraries in your project?

Prerequisites

  • Any JDK (e.g. OpenJDK 11).

  • Maven 3.6.x.

  • IDE (IntelliJ / Eclipse / Visual Studio Code).

  • and verify!

Verify

$ mvn -version

Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /Users/mossaddeque/.sdkman/candidates/maven/current
Java version: 11.0.6, vendor: AdoptOpenJDK, runtime: /Users/mossaddeque/.sdkman/candidates/java/11.0.6.hs-adpt
Default locale: en_NL, platform encoding: UTF-8
OS name: "mac os x", version: "10.15.4", arch: "x86_64", family: "mac"

Sample Maven Project

$ cd java-maven-basics
$ mvn archetype:generate -DgroupId=com.unloadbrain -DartifactId=hello-world -DarchetypeArtifactId=maven-archetype-quickstart -DarchetypeVersion=1.4 -DinteractiveMode=f
$ tree hello-world

hello-world
|-- pom.xml
`-- src
    |-- main
    |   `-- java
    |       `-- com
    |           `-- unloadbrain
    |               `-- App.java
    `-- test
        `-- java
            `-- com
                `-- unloadbrain
                    `-- AppTest.java

9 directories, 3 files

Basic commands

$ cd hello-world
$ mvn compile
$ tree .

.
|-- pom.xml
|-- src
|   |-- main
|   |   `-- java
|   |       `-- com
|   |           `-- unloadbrain
|   |               `-- App.java
|   `-- test
|       `-- java
|           `-- com
|               `-- unloadbrain
|                   `-- AppTest.java
`-- target
    |-- classes
    |   `-- com
    |       `-- unloadbrain
    |           `-- App.class
    |-- generated-sources
    |   `-- annotations
    `-- maven-status
        `-- maven-compiler-plugin
            `-- compile
                `-- default-compile
                    |-- createdFiles.lst
                    `-- inputFiles.lst

19 directories, 6 files
$ mvn clean compile
$ mvn package
$ java -cp target/hello-world-1.0-SNAPSHOT.jar com.unloadbrain.App

Advanced

$ cat ~/.m2/settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
                              http://maven.apache.org/xsd/settings-1.0.0.xsd">
  <servers>
    <server>
      <id>github</id>
      <username>mmahmoodictbd</username>
      <password>TOKEN</password>
    </server>
  </servers>

  <profiles>
    <profile>
      <id>defaultProfile</id>
      <activation>
        <activeByDefault>true</activeByDefault>
      </activation>
      <repositories>
        <repository>
          <id>github</id>
          <name>GitHub mmahmoodictbd Apache Maven Packages</name>
          <url>https://maven.pkg.github.com/mmahmoodictbd</url>
        </repository>
      </repositories>
    </profile>
  </profiles>
</settings>