Maven

1. Introduction to
MAVEN

2. What is Maven?
Maven v/s ANT
Create a simple project in Maven
mvn archetype:generate -DgroupId=com.lumesse.talentcloud
-DartifactId=sample
-DarchetypeArtifactId=maven-archetype-quickstart
-DinteractiveMode=false

3. Super POM
http://maven.apache.org/pom.html#The_Super_POM

4. Using A Single Repository

5. Maven Build Lifecycle and Phases:
Built-in Build Lifecycles:
• Default, Clean and Site
• The default lifecycle handles your project deployment, the clean lifecycle handles project cleaning,
while the site lifecycle handles the creation of your project's site documentation.
Standard Lifecycles:
• validate: validate the project is correct and all necessary information is available
• compile: compile the source code of the project
• test: test the compiled source code using a suitable unit testing framework. These tests should not
require the code be packaged or deployed
• package: take the compiled code and package it in its distributable format, such as a JAR.
• integration-test: process and deploy the package if necessary into an environment where
integration tests can be run
• verify: run any checks to verify the package is valid and meets quality criteria
• install: install the package into the local repository, for use as a dependency in other projects locally
• deploy: done in an integration or release environment, copies the final package to the remote
repository for sharing with other developers and projects.

6. 2 Ways to assign tasks to build phases
• Packaging
• Plug-ins
Jar Packaging:

7. Configuring Plug-ins
• Build plugins will be executed during the build
and then, they should be configured in the
<build/> element.
• Reporting plugins will be executed during the
site generation and they should be configured
in the <reporting/> element.

8. ...
<build>
<plugins>
<plugin>
<groupId>org.codehaus.modello</groupId>
<artifactId>modello-maven-plugin</artifactId>
<version>1.4</version>
<executions>
<execution>
<configuration>
<models>
<model>src/main/mdo/maven.mdo</model>
</models>
<version>4.0.0</version>
</configuration>
<phase>generate-sources</phase>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
...

9. package sample.plugin;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;
/**
* Says "Hi" to the user.
*
*/
@Mojo( name = "sayhi")
public class GreetingMojo extends AbstractMojo
{
public void execute() throws MojoExecutionException
{
getLog().info( "Hello, world." );
}
}
Simple MOJO Example

10. <project>
<modelVersion>4.0.0</modelVersion>
<groupId>sample.plugin</groupId>
<artifactId>hello-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>maven-plugin</packaging>
<dependencies>
<dependency>
<groupId>org.apache.maven</groupId>
<artifactId>maven-plugin-api</artifactId>
<version>2.0</version>
</dependency>
</dependencies>
</project>
MOJO’s pom.xml

11. ...
<build>
<plugins>
<plugin>
<groupId>sample.plugin</groupId>
<artifactId>hello-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
</plugin>
</plugins>
</build>
...
Executing Your First Mojo
mvn sample.plugin:hello-maven-plugin:1.0-SNAPSHOT:sayhi
mvn hello:sayhi

12. /**
* The greeting to display.
*/
@Parameter( property = "sayhi.greeting", defaultValue = "Hello World!" )
private String greeting;
Defining Parameters Within a Mojo
Configuring Parameters in a Project
<plugin>
<groupId>sample.plugin</groupId>
<artifactId>hello-maven-plugin</artifactId>
<version>1.0-SNAPSHOT</version>
<configuration>
<greeting>Welcome</greeting>
</configuration>
</plugin>

13. Using Executions Tag<project>
...
<build>
<plugins>
<plugin>
<artifactId>maven-myquery-plugin</artifactId>
<version>1.0</version>
<executions>
<execution>
<id>execution1</id>
<phase>test</phase>
<configuration>
<url>http://www.foo.com/query</url>
<timeout>10</timeout>
<options>
<option>one</option>
<option>two</option>
<option>three</option>
</options>
</configuration>
<goals>
<goal>query</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
</project>

14. <executions>
<execution>
<id>execution1</id>
<phase>test</phase>
<configuration>
<url>http://www.foo.com/query</url>
<timeout>10</timeout>
<options>
<option>one</option>
<option>two</option>
<option>three</option>
</options>
</configuration>
<goals>
<goal>query</goal>
</goals>
</execution>
<execution>
<id>execution2</id>
<configuration>
<url>http://www.bar.com/query</url>
<timeout>15</timeout>
<options>
<option>four</option>
<option>five</option>
<option>six</option>
</options>
</configuration>
<goals>
<goal>query</goal>
</goals>
</execution>
</executions>

15. Maven Antrun Plug-in
<project>
[...]
<build>
<plugins>
<plugin>
<artifactId>maven-antrun-plugin</artifactId>
<version>1.7</version>
<executions>
<execution>
<phase> <!-- a lifecycle phase --> </phase>
<configuration>
<target>
<!--
Place any Ant task here. You can add anything
you can add between <target> and </target> in a
build.xml.
-->
</target>
</configuration>
<goals>
<goal>run</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
[...]
</project>

16. Dependency Scopes
• Compile
• Provided
• Runtime
• Test
• System
• Import

17. Dependency Scopes – System
<project>
...
<dependencies>
<dependency>
<groupId>javax.sql</groupId>
<artifactId>jdbc-stdext</artifactId>
<version>2.0</version>
<scope>system</scope>
<systemPath>${java.home}/lib/rt.jar</systemPath>
</dependency>
</dependencies>
...
</project>

18. Best Practices
• Dependency Management
• Plug-in Management

19. Good to Know Facts
1) Surefire plugin:
Accepted class names are
**/*Test.java
**/Test*.java
**/*TestCase.java
And the default excludes are:
**/Abstract*Test.java
**/Abstract*TestCase.java
2) Putting a jar in local repository
mvn install:install-file
-Dfile=<path-to-file>
-DgroupId=<group-id>
-DartifactId=<artifact-id>
-Dversion=<version>
-Dpackaging=<packaging> -DgeneratePom=true

20. Good to Know Facts
3) Skip tests in Maven:
-Dmaven.test.skip=true  skips test compilation and execution
-DskipTests=true  skips test execution only
4) Produce execution debug output or error messages in Maven
Use -X parameter or -e parameter

21. References
• http://maven.apache.org/index.html
• http://maven.apache.org/plugins/index.html
• http://maven.apache.org/developers/index.html

22. Creating your own Archetypes
• An archetype descriptor (archetype.xml in directory:
src/main/resources/META-INF/maven
• The prototype files that are copied by the archetype plugin (directory:
src/main/resources/archetype-resources/)
• The prototype pom (pom.xml in: src/main/resources/archetype-resources)
• A pom for the archetype (pom.xml in the archetype's root directory).

23. Aggregation

24. Thank You