exigen services confidential apache maven 2 overview getting started with apache maven 2 25 december...

Exigen Services confidential Exigen Services confidential

Apache Maven 2 Overview

Getting started with Apache Maven 2

April 21, 2023

Exigen Services confidential

The Goal

• Understand Maven principles

• Build project with Maven

• Compare to Apache Ant

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GETTING STARTED

What is Maven?

3


Glossary

• Artifact

• Maven repository

• Dependency

4


What is Maven?

• Open Source: Apache License 2.0

• Uniform build system

• Knowledge accumulator

• Project management tool

• Declarative logic instead of imperative

5


Maven help us

• Build

• Dependencies

• Quality project info

• Release

6


CORE MAVEN 2

Change your mind

7


Maven project

pom.xml

source code

generatedcode

resources binaryfiles

RepositoriesProject lifecycleProject lifecycle

plug-inplug-in plug-inplug-in plug-inplug-in

Project Object Model

Project Object Model

DependencyManager

DependencyManager

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groupIdartifactIdversiontype

groupIdartifactIdversiontype

Project Object Model (pom.xml)

• Identification

• Hierarchy

• Structure

• Dependencies

• Build settings

my-appmy-app

parentparent

another-appanother-app

Spring2.5.6

Spring2.5.6

Junit4.5

Junit4.5

ServletAPI2.5

ServletAPI2.5

my-appmy-app

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project homeproject home

sourcessources

classesclasses

etc.etc.


Super POM

• Package: jar

• Default project structure

• Default artifacts Repository

• Release profile

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Default folders structure

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Maven does your work

• Store your stuff only

• Maven knows what you need

• Dependencies are stored in shared repository

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Dependency scope

ResultScope

Compile classpath

Result package

Test classpath

Lookup repository

compile + + + +

provided + - + +

runtime - + + +

test - - + +

system + - + -

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Transitive dependencies

my-appmy-app

dependency.1dependency.1 dependency.2dependency.2 dependency.3dependency.3

dependency.1.1dependency.1.1 dependency.1.2dependency.1.2

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Transitive dependency scope

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our dependency

dependency of our dependency

result scope of 3rd party dependency


Maven Repository

User workstation Local network Internet

internal external

Central (default)

Local repositoryLocal repository External repositoriesExternal repositories

user local

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Build lifecycle

1. validate

2. compile

3. test

4. package

5. verify

6. install

7. deploy

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check pom.xml

compile the source

run unit tests

create jar/war/...

verify the package

publish package to local repo

publish package to remote repo


MAVEN IN ACTION

Simple Maven project example

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Installation

1. Requirements:• JRE/JDK 1.4 or higher

2. Download

3. Unzip

4. Setup environment variables:• M2_HOME• M2• PATH

5. Enjoy

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Configuration

• Global• <M2_HOME>/conf/settings.xml

• User local• <USER_HOME>/.m2/settings.xml

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settings.xml

• Path to local repository

• Proxy

• Repository mirrors

• Servers authentication

• Profiles

• Other Maven 2 configurations

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Configuration - Proxy

<settings>

<proxies>

<proxy>

<active>true</active>

<protocol>http</protocol>

<host>cache</host>

<port>3128</port>

</proxy>

</proxies>

</settings>

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• mvn [goal(s)] [phase(s)] [options]• mvn compile:compile• mvn install• mvn install –X –DsomeProperty=10

mvn

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mvn <plugin>:<goal>mvn <plugin>:<goal>

mvn <phase name>mvn <phase name>


Start-up new project

mvn archetype:create

-DarchetypeGroupId=org.apache.maven.archetypes

-DgroupId=com.exigenservices.training

-DartifactId=myjsf

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Result:

• Default folder structure• pom.xml• First java class• First unit-test class


pom.xml: Minimal POM

<project>

<modelVersion>4.0.0</modelVersion>

<groupId>com.exigenservices.app</groupId>

<artifactId>my-app</artifactId>

<version>SNAPSHOT</version>

</project>

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pom.xml: Dependencies

<project>

<dependencies>

<dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

<version>4.6</version>

<scope>test</scope>

</dependency>

</dependencies>

</project>

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Add repository

<project>

<repositories>

<repository>

<id>Jboss.repository</id>

<url>

http://repository.jboss.org/maven2

</url>

</repository>

</repositories>

</project>

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pom.xml: Plug-ins configuration

<project>

<build>

<plugins>

<plugin>

<artifactId>maven-compiler-plugin</artifactId>

<configuration>

<source>1.5</source>

<target>1.5</target>

</configuration>

</plugin>

</plugins>

</build>

</project>

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Build project

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• mvn install

1. validate

2. compile

3. test

4. package

5. install


Install and Deploy

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…

installinstall

Local network Internet

deploydeploy


When deploy is needed?

• Release

• Update snapshot• available for other projects

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IDE INTEGRATION

Develop with pleasure!

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IDE list

• InteliJ IDEA from 7.0

• Eclipse

• NetBeans 6.5

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NetBeans

• Embedded

• Basic features

• Weak Dependency Management

34


Eclipse

• Plug-in “m2eclipse”

• All necessary features

• Dependency synchronization

• POM visual editor

• Lifecycle build runners

35


InteliJ IDEA

• Embedded from 7.0

• All Necessary Features

• Dependency synchronization

• XML editor for POM

• Lifecycle build runners

36


CONCLUSION

Let’s summarize

37


Advantages (vs. Ant)

• Know Maven – can build project

• Dependency management

• Less CM activities

• Force to standardization

• Readable pom.xml

• High reusability

38


Disadvantages (vs. Ant)

• Understanding

• Artifacts search

• Plug-ins documentation

• “Exotic things” - maven-ant-plugin

• Difficult to move from Ant

39


Maven repositories

• Central http://repo1.maven.org/maven2/

• Central repository Explorer http://mvnrepository.com

• Collection of plugins for Maven 2 http://mojo.codehaus.org

• JBoss http://repository.jboss.com/maven2/

• Sun http://download.java.net/maven/2/

• Atlassian http://repository.atlassian.com/maven2/

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References

• Maven site http://maven.apache.org

• Quick guide http://maven.apache.org/guides/MavenQuickReferenceCard.pdf

• Maven FAQhttp://docs.codehaus.org/display/MAVENUSER/FAQs-1

• Maven: The Definitive Guidehttp://www.sonatype.com/node/158?file=books/maven-definitive-

guide.pdf

• Maven overview in Russian http://www.ibm.com/developerworks/ru/edu/j-mavenv2/index.html

• m2eclipse plug-inhttp://m2eclipse.codehaus.org

41


QUESTIONS

Now it’s your turn…

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