Apache maven simple guide for installation, configuration, and usage.

Installation and configuration

  • Download the package
  • Set env variable M2_HOME = MAVEN_EXTRACTED_DIR
  • Add executable to system path: $M2_HOME/bin

mvn help:system

  • Get help for sub command
  • Setup local repository for local storage
  • Customize local repo location: conf/settings.xml -> localRepository

Config pom.xml

  • Dependency configuration - GAV:
...
<groupId>com.xxx.xxx</groupId>
<artifactId>myapp</artifactId>
<version>1.0</version>
...

<dependencies>
  <dependency>
    <groupId>junit</groupId>
    <artifactId>junit</artifactId>
    <version>4.10</version>
    <scope>test</scope>
  </dependency>
  ...
</dependencies>
  • Common commands:
    • mvn compile
    • mvn clean
    • mvn package
    • mvn install
    • mvn test

eclipse maven plugin

  • m2eclipse
  • Window -> Preferences -> Maven -> Installations -> Add -> local_maven -> OK
  • Create maven project:
    • New -> Project -> Other -> Maven -> Maven project -> Next
    • maven-archetype-quickstart-1.1.jar
    • Modify jvm memory args: eclipse.ini -Xms512m -Xmx1024m

Dependency resolution

  • Pass-on: A->B; B->C; => A->C
  • Conflict:
    • Same level: the earliest wins;
    • Diff level: the shortest wins;
  • Explicit exclusion:
<exclusions>
  <exclusion>
    ...
  </exclusion>
</exclusions>

Aggregation and inheritance

  • Aggregation
...GAV...
<packaging>pom</packaging>

<modules>
  <module>.../other</module>
  ...
  <module>.../etc</module>
</modules>
  • Inheritance
<dependencyManagement>
  <dependencies>
    <dependency>
    </dependency>
  <dependencies>
</dependencyManagement>

<parent>
  ...GAV...
  <relativePath>...</relativePath>
</parent>

<artifactId>...</artifactId>

Repositories

BACK TO TOP
Post tagged with: maven, java