Maven is a project management and comprehension tool that can be used for building, reporting and managing Java projects. It handles project build automation and dependency management. The core concepts in Maven include the Project Object Model (POM) file which describes the project, dependencies and plugins. Maven uses a build lifecycle of phases like validate, compile and package and plugins can be executed during these phases. It downloads dependencies from online repositories and manages them in the local repository.

1. Using Maven 2 Andreas Andreou [email_address] amplafi.com, co-founder apache tapestry, committer – PMC

2. History Alexandria Forrest Gump Maven Turbine Tomcat Ant James Duncan Davidson, Sam Ruby, Jason van Zyl, Bob McWhirter

3. What is Maven? Project management tool = more than a build tool POM (project object model) Dependency management system Convention over configuration Project lifecycle Execution logic for each phase in lifecycle

4. POM Project coordinates groupId artifactId version packaging (jar, war, ear, maven-plugin, …) Project info (developers, website, scm url) Dependencies Plugins

5. Installing Maven Download / extract zip Set M2_HOME env-var Add M2_HOME/bin to path Folders created when maven is used: USER_HOME/.m2/repository/ USER_HOME/.m2/settings.xml

6. Simplest pom.xml <project> <modelVersion> 4.0.0 </modelVersion> <groupId> gr.jhug </groupId> <artifactId> javabb </artifactId> <version> 1.0-SNAPSHOT </version> <packaging> jar </packaging> <name> PHPBB-NUKE-killer </name> </project> src/main/ src/main/java/ src/main/resources/ src/test/ src/test/java src/test/resources

7. Maven Lifecycle validate generate-sources process-resources compile test-compile test package install verify deploy Maven execution needs phase and runs all previous: mvn compile … or standalone plugin goal: mvn jetty:run mvn scm:update

8. Some more plugins maven-clean-plugin maven-compiler-plugin maven-jar-plugin maven-war-plugin maven-dependency-plugin maven-release-plugin maven-source-plugin maven-surefire-plugin maven-ant-plugin maven-archetype-plugin maven-checkstyle-plugin maven-pmd-plugin

9. Dependencies Uses groupId, artifactId, version Supports transitive dependencies Needs correct usage of ‘scope’ compile test provided runtime system Retrieved from public locations (ibiblio, e.t.c.) Stored on local repo (~/.m2/repository/)

10. Versions in Dependencies <major>.<minor>.<revision> ([ -<qualifier> ] | [ -<build> ]) 4.1.6 4.1.6-SNAPSHOT [4.1.6,5) If same dependency included more than once (how???), biggest wins

11. Maven & IDEs Supported in all major IDEs From pom.xml generate IDE specific files mvn eclipse:eclipse mvn idea:idea Directly read pom.xml and setup project 2 plugins for eclipse: m2eclipse, q4e Bundled plugin in IDEA Plugin from update center for Netbeans … but maven is (still) more powerful!

12. Repository Manager Proxies between your organization and the public Maven repositories Deployment destination for your own generated artifacts Sonatype Nexus Maven Archiva Artifactory

13. Links http://ant.apache.org/faq.html http://maven.apache.org/background/history-of-maven.html http://jakarta.apache.org/alexandria/legacy/ http://gump.apache.org/why.html http://www.sonatype.com/books/maven-book/index.html http://maven.apache.org/repository-management.html http://delicious.com/andyhot/maven

14. Demo - Q&A

15. Companies sonatype.com Jason van Zyl, Mark de Visser, Brian Fox, John Casey Nexus, m2eclipse Exist <- DevZuz <- Mergere Brett Porter, Carlos Sanchez q4e