maven tutorial for complete beginners

8/11/2019 Maven Tutorial For Complete Beginners

1/15

Maven

Build tool

Similar to ant in this senseQuality Management

Used to run tests and generate reports


2/15

Common activities

Multiple jars

Dependencies and versions

Project structureBuild, publish and deploy


3/15

Maven POM

Project Object Model

Describes a ProjectName & Version

Artifact Type

Repositories

DependenciesPlugins

Profiles (Alternate Build Configurations)


4/15

Project Identifier (GAV) Maven identifies a project using

GroupId

ArtifactId

Version (Snapshot for in-development version) Describes a Project

Name & Version

Artifact Type

Source Code Locations

Dependencies

Plugins

Profiles (Alternate Build Configurations)


5/15

Project Identifier (GAV)

4.0.0

maven-trainingorg.lds.training

1.0

jar

Packaging element tells maven how to build the project Examples are jar, war, ear, custom

Default is jar


6/15

Project Inheritance POM files can inherit configurations

groupId, version

Project Config

Dependencies

Plugin Configurations

etc

maven-training-parent

org.lds.training

1.0

4.0.0

maven-training

jar


7/15

Standard Directory Layouttarget: Default work directorysrc: All project source files go in this directorysrc/main: All sources that go into primary artifact

src/test: All sources contributing to testing projectsrc/main/java: All java source filessrc/main/webapp: All web source filessrc/main/resources: All non compiled source filessrc/test/java: All java test source files

src/test/resources: All non compiled test source files


8/15

Maven Build Lifecycle

Maven build follows a lifecycle

Some common phasesgenerate-sourcescompile

test

package

installdeploy

clean


9/15

Maven repositories

Dependencies are download from repository via http

Downloaded dependencies are cached in a local repository

Usually found in ~/.m2/repository

Repository follows a simple folder structure.{groupId}/{artifactId}/{version}/{artifactId}-{version}.jar

groupId . is replaced with /

By default, maven uses the following repositoryhttp://repo1.maven.org/maven2


10/15

Defining Repositories

Repositories are defined in pom or settings

Repositories can be inherited from parent

Repositories are identified by id

...

lds-main

Uworx Nexus

http://10.210.40.37:8081/nexus/content

true

never


11/15

Dependencies

Register dependencies in pom.xml

Concept of transitive dependencies Can be controlled using exclusions or optional

declarations

Only compile and runtime scopes are transitive

Dependencies consist of

G.A.V (GroupId, ArtifactId, Version) Scope (compile, test, provided)

If version is not supplied, maven downloads thedefault version.


12/15

Adding dependencies

...

javax.servlet

servlet-api

2.5

provided

Dependencies can be made optional so that theyare not resolved transitively


13/15

Dependency exclusions

Exclusions exclude transitive dependencies

...

org.springframework

spring-core

3.0.5.RELEASE

commons-logging

commons-logging


14/15

Settings.xml

Contains configurations that

Should not be bundled to any specific project

Should not be distributed to an audience (user specificsettings)

Found at location

~/.m2/settings.xml

Contains configurations such as:

Remote repositories

Profiles


15/15

Archetypes

Maven project templating toolkit

Quickly generate projects

Best practices employed by your organization

maven tutorial for complete beginners

Documents