Maven is a software project management and comprehension tool that helps manage a project's build process, dependencies, and documentation from a central Project Object Model (POM) file. It addresses issues in large projects with many modules by establishing common conventions for directory structure and dependencies. Maven uses a build lifecycle of phases like compile, test, package to automatically build projects. Nexus is an artifact repository manager that stores dependencies and allows sharing across projects through remote, proxy, and hosted repositories.

1. Sonatype Nexus and Maven BasicsFebruary 9, 2010

2. 2Apache Maven is a software project management and comprehension tool. Based on the concept of a project object model (POM), Maven can manage a project's build, reporting and documentation from a central piece of information. What is Maven

3. 3Problems Addressed and Uses for MavenLarge software projects usually contain tens or even hundreds of projects/modules

4. Will become messy and incomprehensible if the projects don’t adhere to some common principles

5. Will be time-consuming to build all projects manuallyUse a project management tool (like Maven)Maven helps you with various aspects:Build processProject structureDependency managementAccess to information and documentation

6. 4Build processThe Project Object Model (POM) – an XML file – is the heart of a Maven 2 projectContains project information and configuration details used to build the project

7. Project dependencies

8. Commands (goals) that can be executed

9. Plugins

10. Metadata

11. The POM extends the Super POM5POM - Simple example

12. 6POM – Project inheritance

13. 7POM – Project aggregation

14. 8The build lifecycle is the process of building and distributing an artifactA phase is a step in the build lifecycleMost important default phases:ValidateCompileTestPackageInstallDeploySome common phases not default:CleanSiteFor each step, all previous steps are executedBuild Lifecycle and Phases

15. 9Advantages:A developer familar with Maven will quickly get familiar with a new projectNo time wasted on re-inventing directory structures and conventionssrc/main/java Javasource files goes heresrc/main/resources Other resources your application needssrc/main/filters Resource filters (properties files)src/main/config Configuration filessrc/main/webapp Web application directory for a WAR projectsrc/test/java Test sources like unit tests (not deployed)src/test/resources Test resources (not deployed)src/test/filters Test resource filter files (not deployed)src/site Files used to generate the Maven project websiteStandard directory layout

16. 10Dependency: a third-party or project-local software library (JAR or WAR file)Dependency management is a challenge in multi-module projectsDependency management

17. 11Dependency management

18. 12Dependency management