An introduction to Apache Maven

1
Apache Maven

• What is it ?
• How does it work ?
• Why use it ?
• Structure
• Usage
• Examples

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2
Apache Maven What is it ?

• A build automation tool
• Mainly for Java projects
• Uses conventions for build structure / procedure
• Licensed by Apache
• Developed via Jakarta project
• Stores libraries and plugins in a central
  repository

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3
Apache Maven How does it work ?

• Build controlled via pom.xml project file
• POM Project Object Model
• Uses standard build order, directories, plugins
• Identifies dependencies in the pom.xml
• One POM can call child POM's
• It makes the build easier
• Provides uniformity

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4
Apache Maven Why use it ?

• Remove complexity from the build process
• Use a uniform process
• Make the build repeatable
• Make the build consistent with other projects
• Provides a controlled release process
• Manages depedencies

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5
Apache Maven Structure

• Using Maven 0.9 as an example
• the structure of the Maven directories

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6
Apache Maven Usage

• In terms of usage most estimates seem to agree
• Maven / Ant / Eclipse are the most used

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7
Apache Maven Example

• Taking the build of hadoop-2.0.6-alpha as an
  example
• A parent pom.xml calls module hadoop-project
• ltmodulesgt
• ltmodulegthadoop-projectlt/modulegt
• ltmodulegthadoop-project-distlt/modulegt
• ltmodulegthadoop-assemblieslt/modulegt
• Identifies plugins
• ltplugingt
• ltgroupIdgtcom.atlassian.maven.pluginslt/gr
  oupIdgt
• ltartifactIdgtmaven-clover2-pluginlt/artifa
  ctIdgt
• ltversiongt3.0.5lt/versiongt
• lt/plugingt

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8
Apache Maven Example

• Taking the build of hadoop-2.0.6-alpha as an
  example
• A child pom.xml defines properties
• ltpropertiesgt
• ltfailIfNoTestsgtfalselt/failIfNoTestsgt
• ltmaven.test.redirectTestOutputToFilegttruelt/mav
  en.test.redirectTestOutputToFilegt
• Identifies dependencies
• ltdependencygt
• ltgroupIdgtorg.mortbay.jettylt/groupIdgt
• ltartifactIdgtjetty-utillt/artifactIdgt
• ltversiongt6.1.26lt/versiongt
• lt/dependencygt
• Defines profiles
• Defines plugins
• Defines the Build

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9
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