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mvn [<plugin>:]<goal>
  - General use

mvn archetype:generate -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false
  - Example project create
  
mvn test
  - Run unit tests specified by pom.xml (need unit dependancies in pom)
  
mvn sonar:sonar
  - Create sonar report based on pom in current directory
  
Maven Phases

- 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.

Artifacts fully qualified name: <groupId>:<artifactId>:<version>

POM
======
Minimal:
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.mycompany.app</groupId>
  <artifactId>my-app</artifactId>
  <version>1</version>
</project>

Maven inherits it's defaults from a super POM if not defined:
  dependencies
  developers and contributors
  plugin lists (including reports)
  plugin executions with matching ids
  plugin configuration
  resources

Can be used to specify parent to inherit from:
  <parent>
    <groupId>com.mycompany.app</groupId>
    <artifactId>my-app</artifactId>
    <version>1</version>
  </parent>
  
Else can specify modules un the app pom to have a cascade of build:
  <packaging>pom</packaging>
  <modules>
    <module>my-module</module>
  </modules>
  
Variables are available in the form ${project.<name>} for example ${project.version}
  In the project file this get be references just using ${version}
Additional special variables:
  project.basedir
  project.baseUri
  maven.build.timestamp

Setup JavaDocs
=====
Add to pom.xml:
<build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-javadoc-plugin</artifactId>
        <version>2.10.3</version>
      </plugin>
    </plugins>
  </build>

Then run mvn javadoc:javadoc

References
=====
http://maven.apache.org/guides/getting-started/maven-in-five-minutes.html
http://docs.codehaus.org/display/SONAR/Analyzing+with+Maven
http://maven.apache.org/guides/getting-started/index.html