This document provides an overview of Maven concepts including the Project Object Model (POM), dependencies, lifecycles, plugins, profiles, and source code management. Maven is a build tool that manages dependencies, builds, reports and documentation of software projects. It uses a POM file to manage a project's build configuration and dependencies. The POM defines things like the project's dependencies, developers, plugins and more. Maven has built-in lifecycles and plugins that allow it to compile, test, package, install and deploy projects. It also supports profiles to customize builds for different environments.

1. Maven

2. Outline
• POM
• Dependency
• Life cycle
• Plugin
• Profile
• SCM

3. Maven
• Dependency Management
• Remote Repositories
• Universal Reuse of Build Logic
• Tool Portablility/Integration
• Easy Searching and Filtering of Project
Artifact

4. Project Object Model (POM)
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>com.estinet</groupId>
<artifactId>controller</artifactId>
<version>1.0.0</version>
</project>
•groupId
•Group identifier
•Java package name
•arti
•project main identifier

5. Effective POM
• mvn help:effective-pom
• de
Super POM
com.estinet.controller
bod
1.0-SNAPSHOT
com.estinet.switch
broadcom
1.0-SNAPSHOT

6. Project Inheritance
• dependencies
• developers and contributors
• plugin lists (including reports)
• plugin executions with matching ids
• plugin configuration
• resources

7. Project Inhertance
<project>
<parent>
<groupId>com.estinet</groupId>
<artifactId>controller</artifactId>
<version>1.0.0</version>
</parent>
<artifactId>bod</artifactId>
</project>

8. SNAPSHOT Version
• Expand SNAPSHOT to UTC date and
time
• e.g.,
– 1.0-SNAPSHOT
– 1.0-20160616-150000-1

9. Properties
• env
– exposed by OS
${evn.PATH}
• project
– project variable, defined in POM
${project.groupId}
• setting
– setting variable
– ./.m2/setting.xml
${setting.offline}

10. Project Dependency
<project>
...
<dependencies>
<dependency>
<groupId>org.codehaus.xfire</groupId>
<artifactId>xfire-java5</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
...
</dependency>
</dependencies>
</project>

11. Dependency Scope
• compile
– default
• provided
– required on compilation, but not for execution
– provided by JDK or other container
• runtime
– required for execution and test
• test
– for test only
• system
– like provided
– must supply systemPath

12. Grouping Dependencies
<project>
<groupId>com.estinet.controller</groupId>
<artifactId>controller-dependencies</artifactId>
<version>1.0.0</version>
<packaging>POM<packaging>
<dependencies>
<dependency>
<groupId>org.codehaus.xfire</groupId>
<artifactId>xfire-java5</artifactId>
<version>1.2.5</version>
</dependency>
<dependency>
...
</dependency>
</dependencies>
</project>
install POM to your local repository (~/.m2)
mvn install

13. Grouping Dependencies
<project>
...
<dependencies>
<dependency>
<groupId>com.estinet.controller</groupId>
<artifactId>controller-dependencies</artifactId>
<version>1.0.0</version>
<type>POM</type>
</dependency>
<dependency>
...
</dependency>
</dependencies>
</project>

14. Multi-Modules
<project>
...
<modules>
<module>simple-weather</module>
<module>simple-webapp</module>
</modules>
</project>

15. Maven Usages
usage: mvn [options] [<goal(s)>]
[<phase(s)>]

16. Lifecycle
lifecycle description
clean clean the build directory
default complie, test, package, deploy
site report, document

17. Clean Lifecycle
Phase
pre-clean
clean
post-clean
command description
mvn clean execute the clean lifecycle
including pre-clean, clean, post-clean
mvn clean:clean execute the clean phase of the clean lifecycle

18. Default Lifecycle
Phase Phase
validate test
generate-sources prepare-package
process-sources package
generate-resources pre-integration-test
process-resources verify
compile install
generate-test-sources deploy
process-test-sources
generate-test-resources
process-test-resources
test-compile

19. Default Lifecycle
command description
mvn validate execute validate phase
mvn compile execute from validate phase to compile phase
mvn test execute from validate phase to test phase
mvn install execute fomr validate phase to install phase

20. Package-specific Lifecycle
(JAR)
Lifecycle Phase Goal <pluging>:<goal>
process-resource resources:resources
compile compiler:compile
process-test-resources resources:testResources
test-compile compiler:testCompile
test surefire:test
package jar:jar
install install:install
deploy deploy:deploy

21. Package-specific Lifecycle (POM)
Lifecycle Phase Goal <pluging>:<goal>
package site:attach-descriptor
install install:install
deploy deploy:deploy

22. Test
• Run as JUNIT test
• Variables
– testSourceDirectory
• src/test/java
– testOutputdirectory
• target/test-classes
– result
• target/surefire-reports
• Includsion
– Java filenames that start with "Test"
• **/Test*.java
– Java filenames that end with "Test"
• **/*Test.java
– Java filenames that end with "TestCase"
• **/*TestCase.java

23. Test
mvn -Dtest=TestCircle test
run test on TestCircle class
mvn -Dtest=TestSquare,TestCi*le test
run multiple names/patterns, separated by commas
mvn -Dtest=TestCircle#mytest test
mvn -Dtest=TestCircle#test* test
mvn -Dtest=TestCircle#testOne+testTwo test
run test on multiple methods
mvn install -Dmaven.test.skip=true
skip test

24. Package-specific Lifecycle
(Maven Plugin)
Lifecycle Phase Goal <pluging>:<goal>
generate-resource plugin:descriptor
process-resources resources:resources
compile compiler:compile
process-test-resource resources:testResources
test-compile compile:testCompile
test surefire:test
package jar:jar, plugin:addPluginArtifactMetaData
deploy deploy:deploy

25. Process Resource
copy from
${basedir}/src/main/resource
to
${project.build.outputDirector}
(${basedir}/target/classes by default)

26. Compile
<project>
...
<build>
...
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</aftifactId>
<configuration>
<source>1.6</source>
<target>1.5</tartet>
</configuratin>
</plugin>
</plugins>
</build>
</project>
source java 1.6
vm java 1.5

27. Compile
<project>
...
<build>
...
<sourceDirectory>src/java</sourceDirectory>
<outputDirectory>classes</outputDirectory>
</build>
</project>

28. Plugin
<project>
...
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
</project>
Configure variable used by plugin
"Maven" is really just a core framework for a collection of Maven Plugins

29. <project>
...
<build>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>buildnumber-maven-plugin</artifactId>
<version>1.2</version>
<configuration>
<doCheck>false</doCheck>
<doUpdate>false</doUpdate>
<revisionOnScmFailure>VersionUnknown</revisionOnScmFailure>
</configuration>
<executions>
<execution>
<goals>
<goal>create</goal>
</goals>
<phase>validate</phase>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
execute the plugin goal create in the validate phase

30. <project>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<phase>install</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
......
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
use pluginManagement to
management plugin configuration

31. Profile
• Per Project
– pom.xml
• Per User
– %USER_HOME%/.m2/settings.xml
• Global
– %M2_HOME%/config/settings.xml
mvn groupId:artifactId:goal -P profile-1,profile-2

32. Profile for Development
<profile>
<id>development</id>
<properties>
<db.driverClass>oracle.jdbc.driver.OracleDriver</db.driverClass>
<db.connectionURL>jdbc:oracle:thin:@127.0.0.1:1521:XE</db.connectionURL>
<db.username>devuser</db.username>
<db.password>devpassword</db.password>
<logo.image>mylogo.png</logo.image>
</properties>
</profile>
mvn groupId:artifactId:goal -P development

33. Profile for Production
<profile>
<id>production</id>
<properties>
<db.driverClass>oracle.jdbc.driver.OracleDriver</db.driverClass>
<db.connectionURL>jdbc:oracle:thin:@10.0.1.14:1521:APPS</db.connectionURL>
<db.username>productionuser</db.username>
<db.password>productionpassword</db.password>
<logo.image>production_logo.png</logo.image>
</properties>
</profile>
mvn groupId:artifactId:goal -P production

34. Resource Filtering
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
Enable resource filtering in specific directory
maven variable in files in the specific directory will be replaced
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-resources-plugin</artifactId>
<version>2.3</version>
<configuration>
<encoding>UTF-8</encoding>
</configuration>
</plugin>
add plugin
configure resource filtering

35. Resource Filtering
database.jdbc.driverClass=${db.driverClass}
database.jdbc.connectionURL=${db.connectionURL}
database.jdbc.username=${db.username}
database.jdbc.password=${db.password}
model.application.name=MyWebApp
model.stylesheet=/mywebapp.css
database.jdbc.driverClass=oracle.jdbc.driver.OracleDriver
database.jdbc.connectionURL=jdbc:oracle:thin:@127.0.0.1:1521:XE
database.jdbc.username=myusername
database.jdbc.password=mypassword
model.application.name=MyWebApp
model.stylesheet=/mywebapp.css
db.properties source
db.properties source after resource filtering

36. Profile Activation
<profiles>
<profile>
<id>appserverConfig-dev</id>
<activation>
<property>
<name>env</name>
<value>dev</value>
</property>
</activation>
<properties>
<server.home>/appserver</server.home>
</properties>
</profile>
<profiles>
<profiles>
<profile>
<id>appserverConfig-dev-2</id>
<activation>
<property>
<name>env</name>
<value>dev-2</value>
</property>
</activation>
<properties>
<server.home>/appserver2</server.home>
</properties>
</profile>
<profiles>
actived if env = dev actived if env = dev2

37. Source Code Management (SCM)
Use SCM to update and checkin code
<project>
...
<scm>
<connection>scm:svn:http://somerepository.com/svn_repo/trunk</connection>
<developerConnection>scm:svn:https://somerepository.com/svn_repo/trunk</developerConnection>
<url>http://somerepository.com/view.cvs</url>
</scm>
...
</project>
mvn -Dmessage="<commit_log_here>" scm:checkin
mvn scm:update
check in code
update

38. Name Value
-Dmaven.test.skip=true skip test
-o work offline, skip download pom
-P <args> configurate active profile
-X enable debug output
-q quiet output, only show errors
-npu no pluging updates
help:active-profiles
help:effective-pom output effective pom
help:effective-setting output effective setting
help:describe describe plugin, mvn help:describe -Dplugin=help