Maven beyond “Hello world”

by Gabriel Dogaru

What / why / how?

● Corporate environment● Build large projects● 10+ modules

Some hate maven

Maven builds are an infinite cycle of despair that will slowly drag you into the deepest, darkest pits of hell (where Maven itself was forged).

http://kent.spillner.org/blog/work/2009/11/14/java-build-tools.html

“Sounds like my first wife.”

David Letterman

What do I need ?

● Stable builds● Reproducible builds● Reports● Releases ● Control over source code and dependencies● Build automation● Easy development cycle● What else ???

Do you know a ninja?

● Developers are smart ● Make builds fool proof● Have a build team

Control your sources

Install an maven repository manager

http://maven.apache.org/repository-management.html

Resolving dependencies

http://today.java.net/article/2010/01/04/maven-repository-managers-enterprise

Deploying dependencies

http://today.java.net/article/2010/01/04/maven-repository-managers-enterprise

~/.m2/settings.xml

Control dependencies

● Use a parent pom (super pom)● maven-enforcer-plugin

Parent pom example

http://maven.apache.org/ref/3.0.4/maven-model-builder/super-pom.html

Use dependency management

The Bigger, The Better

● Have many modules● Your IDE loves modules● Try to have separate modules if that makes

sense for you● Do you really need multi module projects?

http://monkeyisland.pl/2010/12/11/ide-and-patterns-for-huge-maven-project/

All for One

one project => one artifact.

Respect thy MAVEN

http://maven.apache.org/guides/introduction/introduction-to-the-standard-directory-layout.html

Know your goals

Know who you are

● Define your own archetypes● Define your own packaging

http://maven.apache.org/guides/mini/guide-creating-archetypes.html

Groovy example

http://groovy.codehaus.org/Groovy-Eclipse+compiler+plugin+for+Maven

Your build is unique

http://www.sonatype.com/books/mcookbook/reference/ch02s03.html

http://ronalleva.com/groovy/maven/programming/2008/01/23/using-the-groovy-maven-plugin-to-do-magic.html

Leave your SNAPSHOT alone

Now we release

The release plugin

http://maven.apache.org/maven-release/maven-release-plugin/

Gets along well with CI

Make nice reports

http://maven.apache.org/plugins/maven-site-plugin/

http://mojo.codehaus.org/sonar-maven-plugin/

Remember

● Maven is not that bad, could be pretty nice● Customize maven to fit your need● but respect the tool● You are never done● Have a master near by that knows the tool● Have a look at Gradle....

Thank You