Maven Overview Part I Denver Java User's Group and Denver BEA User's Group Jan 2006

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Maven OverviewPart 1

Denver JBOSS User’s GroupJanuary 2006Scott Ryan

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Agenda

• Why Maven?• Maven 101• Deployments with Maven• Maven integrations• Maven in the enterprise• Maven 1.0 versus 2.0• Demo

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Agenda

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Analogy: How to develop an application?

My Application

Frameworks

Solution 1

My Application

Solution 2

Container

E.g. Application Server, Eclipse RCP, Net beans, etc

Services

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Maven Objectives

• Make the build process easy • Provide a uniform build system • Provide quality project information • Provide guidelines for best practices

development • Allow transparent migration to new features

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How to develop a build?

My Build

Ant tasks

Solution 1: Ant

My Build

Solution 2: Maven

Maven (Container)Task calls

Goals/Plug-ins

« Maven is a build container »

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Advantages of a Container Approach

• Ability to reuse existing serviceso More than 100 existing Maven plug-ins (jar, cactus,

clover, JIRA, site, dashboard, etc)• Easy to get started

o Just need to configure and extend• Ability to benefit from new services simply by

upgrading• Well-defined and shared structure/architecture

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Advantages (Cont.)

• Easier to maintaino Knowledgeable resources on the marketo Well-defined structure

• It makes sense to use a custom approach when flexibility is a musto This is not usually the case for builds

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Agenda

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Current Versions

• Maven 1o 1.0.2 and 1.1-beta-2o maven commando Cut your teeth here and don’t worry about the beta label

• Maven 2o 2.0.1o mvn commando Can run side by side

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Maven 101

• Maven in 3 concepts:o POM (Project Object Model)o Plug-ins

Made of Goals = Actionso Repositories

• Maven files (1.0)o project.xml

POM (Project Object Model)o maven.xml

Custom goals in Jelly Goal, pre-Goal, post-Goal

o project.properties Runtime Configuration

o build.properties Runtime Configuration

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Maven (2.0) Project Layout

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POM (1.0) example (1/2)

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POM (1.0) example (2/2)

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Project lifecycle with Maven (1.0) plug-ins (1/2)

Prepare Project Compile/ArchiveUnit tests

Quality checks

- Genapp- JBuilder- Idea- JDeveloper- Eclipse- Scm

- Java- Jar- War- Ejb- Ear- Rar- Uberjar- XDoclet- Test- AspectJ

- Checkstyle- PMD- Findbugs- Clover- Emma- JCoverage- JDepend- Ncss- Patterntesting

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Project lifecycle with Maven(1.0) plug-ins (2/2)

EnvironmentDeployment

Functional tests

Site/ReportGeneration

Deployment

- JBoss- WebSphere- WebLogic- Jetty- Cactus- Latka- HttpUnit- Abbot- (Cargo)

- Site• Changes• Jira• Dashboard• Changelog• File activity

- Developer activity

• StatCvs

- Site- Dist- Artifact- War/Ejb/Ear/Jar...- Scm- Nsis- (Cargo)

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Maven 2.0 lifecycle (1)

• validate• generate-sources• process-sources • generate-resources • process-resources• compile• process-classes• post-process

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Maven 2.0 Lifecycle (2)

• generate-test-sources• process-test-sources• generate-test-resources• process-test-resources• test-compile• test• package

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Maven 2.0 lifecycle (3)

• before-integration-test• integration-test• after-integration-test• verify• install• deploy

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Value of a repository structure

• Multiple Levels including environment specific (Dev, QA, Stage, Production)

• Contains Versioned resources• Can control external library usage• Logical Organization of artifacts• Speeds builds using build once philosophy• Provides audit trail (record of build components)• Multilevel security

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Maven Repositories

Maven coreRemote

Repository

Web Server

LocalRepository

project.xml (POM)

JVM 1 JVM 2

Get dependencies

Checks if artifact exists in local repository.

Download artifact

Save artifact in local repository

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Maven 1.0 Repository

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Maven 2.0 Repository

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Agenda

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Deployments with Maven

• It’s still an unconsolidated area in (1.0)• Several plug-ins can be used

o Artifacto SCMo Releaseo Disto Siteo Artifact generation pluginso Weblogic Plugin

• In the future, to be replaced by Maven-Wagon and Maven-SCM

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Release Management

• Integrates with multiple Source code control systems.

• Integrates with JIRA for release management• Allows for separation of concerns to support SOX

initiatives.• Provides audit trail• Easy automation for no touch build and deployment

o Reduces possibility of errors

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Agenda

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Maven integrations• IDE

o Mevenide (Eclipse + Net beans + JBuilder) Goal launcher Search in well known Maven remote repos POM editor POM validation POM/IDE synchronizer Jelly editor Maven builder nature (know which goals should be run when

resources change)• Continuous builds

o Cruise Control, Damage Control, Gump, Continuum• Future (m2): all Java

o Easier integrationo Talks about a Maven IDE

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Agenda

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Continuous build

RemoteRepository

Maven Continuous

LocalRepository Synchronization

Project C Build

get dependent artifacts from A and B

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Multi-location Set-up

Src Repository(CVS)

Continuous Build

MavenRemote

Repository

MavenRemote

Repository

Internet connection / leased line

commits

Synchronization (rsync)

Country 1Country 2

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Maven repositories

Project ARemote

Repository

EnterpriseRemote

Repository

Snapshots

Stable versions

Project BRemote

RepositorySnapshots

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Team organization

• Build Coacho The new type of Quality Manager?o Overall build responsibility

Schedule build improvements in project iterations Defines quality strategies

E.g. Clover: start at 0% and at each iteration increase to level attained. Fail build if below.o Manages build improvementso Improve build-awareness

Every day commit by team Run local build before commits

o Gather build requirements from teams What checkstyle rules do we want to apply? Is the build running fast enough?

o Analyze reasons for build failures• Build leaders in each team

o Analyze build failureso Ensure build failure are given top priority and get fixed ASAPo Coaches team to be build-aware and listen to team

Project Manager

Build Coach Team N

Build Leader

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Agenda

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Maven 1.0 VS 2.0

• Maven 1.0o project.xml,

maven.xml, project.properties

o build.propertieso Open Lifecycleo Plug-ins in Jelly

Loose project dependencies

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Maven 1.0 VS 2.0 (Cont)

• Maven 2.0o Defined Inter-Project

Dependencieso Defined project typeso High performanceo Plug-ins in Marmalade,

Ant or Java

• pom.xml• settings.xml• Defined Lifecycle• Lifecycle based plug-in

goals• Finer grained project

configuration

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Agenda

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Demo time

• Create a new project using the archetype plugin• Create a matching Eclipse project using the eclipse

plugin• Create a jar and run the unit tests (jar/test plug-ins)• Create the developer’s website including reports• Prepare a release• Produce a Release• Continuum

Maven Overview Part I Denver Java User's Group and Denver BEA User's Group Jan 2006

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