lavajug-maven 3.x, will it lives up to its promises
DESCRIPTION
Maven 3.x @ Lava Java Users Group - June 14th, 2012 Apache Maven, the project, the community, the product, ...TRANSCRIPT
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Apache Maven 3.x W I L L I T L I V E U P TO I T S P R O M I S E S ?
L A V A J U G - J U N E 2 0 1 2
Arnaud Héritier Software Factory Manager
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ARNAUD HÉRIT IER
− eXo - Software Factory Manager − In charge of tools and
methods − Apache Maven :
− Committer since 2004 and member of the Project Management Committee
− Coauthor of « Apache Maven» − published by Pearson (in
French) − Contact me :
− http://aheritier.net − Twitter : @aheritier − Skype : aheritier
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1
2
3
4 − Questions
− Why Apache Maven?
− Apache Maven 3.x, Where are we, where are we going to … − Community, Resources, − Backward Compatibility, Performances, Extensibility, Robustness, Pom
− Tesla − What is it ?
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Why ? A PA C H E M AV E N ( 3 . X )
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DEFINIT ION
− Apache Maven is a software project management and comprehension tool.
− Based on the concept of a project object model (POM) − can manage a project's build, binaries, reporting and documentation
from a central piece of information.
− Apache Maven is standards/conventions driven − How many of you are doing JEE and related developments ?
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HISTORY
− Initiated in 2001 by Jason Van Zyl in Alexandria, an Apache Jakarta project,
− Moved to Turbine few months after,
− Became a Top Level Project in 2003.
− 2.0 released in September 2005
− 3.0 released in October 2010 − 3.0.4 – January 2012
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CHOOSE YOUR WAY OF THINKING
Conventions approach Scripting approach
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COMPETITORS ( IN JAVA LAND)
− Ant + Ivy, Easy Ant, Gant, Gradle, Buildr…
− Script oriented − You can do what you want !
− Reuse many of conventions (directories layout, …) and services (repositories) but without enforcing them
− The risk for them : Not being able to evolve due to the too high level of customization proposed to the user. − We tried on 1 and it died because of that. It was impossible to create a
set of tests to cover all usages. − It’s like providing a framework without a well tested set of public API L
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WITH SCRIPTS ORIENTED BUILDS
You can have (if you have good skills)
But often you have (moreover after years …)
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WITH MAVEN
We dream to deliver (Maven 3.x)
But yesterday we too often had (Maven 2.x)
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Where are we ? Where are we going to ? A PA C H E M AV E N 3 . X
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COMMUNITY Apache Maven 3.x
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USERS MAIL ING L IST
− [email protected] − Traffic statistics cover a total
of 2338 days (>6y). − Current subscribers: 1902 − Total posts: 95442 − Mean posts per day: 40.82
− http://pulse.apache.org/
− Blue : − Number of subscribers
− Red : − Number of messages per day
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DEV MAIL ING L IST
− [email protected] − Traffic statistics cover a total
of 2338 days (>6y). − Current subscribers: 676 − Total posts: 63215 − Mean posts per day: 27,04
− http://pulse.apache.org/
− Blue : − Number of subscribers
− Red : − Number of messages per day
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APACHE MAVEN WEB SITE
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APACHE MAVEN WEB SITE
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DOWLOADS
− Per month downloads
− http://people.apache.org/~vgritsenko/stats/projects/maven.html
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RELEASES (LAST 2 MONTHS)
− Plugins − Compiler 2.5.1 (2012-06-04) − Changes 2.7.1 (2012-05-10) − Shade 1.7 (2012-06-01) − Compiler 2.5 (2012-05-27) − Clean 2.5 (2012-05-26) − Release 2.3.1 (2012-05-25) − Invoker 1.6 (2012-05-24) − Remote Resources 1.3
(2012-05-11) − Release 2.3 (2012-05-11) − Site 3.1 (2012-04-30) − Changes 2.7 (2012-04-30) − Compiler 2.4 (2012-04-30) − Site 2.4 (2012-04-26)
− Libraries − Tools 3.0 (2012-05-31) − Runtime 1.0-alpha-3
(2012-05-28) − Testing 2.0 (2012-05-27) − Enforcer 1.1 (2012-05-14) − SCM 1.7 (2012-04-29) − Doxia (base) 1.3 (2012-04-13) − Doxia Sitetools 1.3
(2012-04-17)
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THE COMMUNITY
− ~20 PMC, ~20 committers, ~20 emeritus − A community less isolated : more interactions with Eclipse,
Jetty, …
− A new French PMC Chair in few days : Olivier Lamy (Cocorico !!!)
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RESOURCES Apache Maven 3.x
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BOOKS
− Nicolas De loof Arnaud Héritier − Published by Pearson − Collection Référence − Based on our own
experiences with Maven. − From beginners to experts. − In French only
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BOOKS
− Sonatype / O’Reilly : − The Definitive Guide − http://www.sonatype.com/
books − Free download − Available in several
languages
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BOOKS
− Apache Maven 2 Effective Implementation − Brett Porter, Maria Odea
Ching − https://www.packtpub.com/
apache-maven-2-effective-implementation/book
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BOOKS
− Exist Global − Better builds with Maven − http://www.maestrodev.com/
better-build-maven − Free download
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MANY OTHERS RESOURCES
− Many companies are providing trainings and expertise
− Many resources on internet (blogs, ….)
− The main web site : − http://maven.apache.org
− Project’s team wiki : − http://docs.codehaus.org/display/MAVEN
− Project’s users wiki : − http://docs.codehaus.org/display/MAVENUSER
− Mailing lists
− http://maven.apache.org/mail-lists.html
− IRC − irc.codehaus.org - #maven
− Forums − developpez.net (In French) − Stackoverflow
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BACKWARD COMPATIBILITY Apache Maven 3.x
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BACKWARD COMPATIBIL ITY CRIT ICISMS
− Migration from Maven 1 to 2 was impossible. Everything had to be re-done.
− Updates between 2.x versions and also between 2.0.x weren’t too often without side effects.
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BACKWARD COMPATIBIL ITY
− Near to 700 integration tests
− Tested for several months on a large set of OSS projects
− 7 alphas + 3 betas versions − It’s a revolution under the hood but an evolution for end users
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MAVEN 3 .0 .X ITS
674
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PERFORMANCES Apache Maven 3.x
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PERFORMANCES - CRIT ICISMS
− Maven is slow
− It spends its time to download the world
− Whereas everybody has multicore CPUs, it doesn’t allow to process tasks in parallel
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PERFORMANCES
− A set of benchmark tools was developed to measure performances (IO, CPU, Memory, Network …)
− Startup and execution times are reduced − Java 5 optimizations − Code cleanup and improvements
− Reduced Memory footprint
− Artifacts Resolution Caching − .lastUpdated files in your local repo − Enforce checks with –U option
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PERFORMANCES – PARALLEL BUILDS
− Parallel builds − An execution plan is predefined at startup to define which modules
could be built in // − Requires to have up to date plugins to avoid dead locks and some
others issues − Launch a build with 2 threads
− mvn –T 2 install − Launch a build with 2 threads per CPU core
− mvn –T 2C install
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PERFORMANCES - PLUGINS
− Many improvements in plugins − In Surefire/Failsafe to propose various strategies to execute tests in //
and to order them − In Compiler to keep loaded the classloader used by Javac − In Packaging plugins (Assembly, Jar, War, …) by improving
performances in low level libraries (plexus …)
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EXTENSIBILITY Apache Maven 3.x
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EXTENSIBIL ITY - CRIT ICISMS
− It is difficult and time consuming to extend Maven (write plugins) − Many unknown technologies like Plexus for IOC
− It is difficult/impossible to reuse Maven plugins − Its impossible to extend plugins/mojo and lifecycles
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EXTENSIBIL ITY
− New APIs to improve abstraction of underneath implementation − Aether : to manage artifacts and repositories
− Classloader partitioning
− Embeddable
− IOC replaced by Guice − For now (Maven 3.0) a wrapper is hiding the change − You don’t yet use Guice directly (from plugins for example)
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ROBUSTNESS Apache Maven 3.x
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ROBUSTNESS - CRIT ICISMS
− Builds aren’t predictable
− Errors are difficult to diagnose
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ROBUSTNESS - VALIDATIONS
− Many more validations in POMs (warnings or errors) − Missing plugins versions − Duplicated dependencies in a POM − Incoherent inheritance (wrong relative path or parent not in the upper
directory)
− Improved error messages with links to wiki pages for more detailed information
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ROBUSTNESS ARTIFACTS MANAGEMENT
− Parent POMs prefer to resolve from repositories − Version less parent will be available in a future 3.x release by using the
relativePath element
− Profiles usage consolidation − No more profiles.xml (incompatible with future polyglot feature)
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ROBUSTNESS ARTIFACTS MANAGEMENT
− No more support for legacy repository layout for Maven 1.0
− SNAPSHOTs are always deployed with timestamps
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ROBUSTNESS PLUGINS MANAGEMENT
− version is by default RELEASE and no more SNAPSHOT − Affects command-line invocation
− Plugins cannot use versions LATEST or RELEASE − Affects command-line invocation and POM
− Plugins are resolved only from <pluginRepository> entries
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ROBUSTNESS – S ITE PLUGIN
− Site is now completely extracted from core − It has its own lifecycle − reporting section in POM becomes useless (moved in configuration)
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POM Apache Maven 3.x
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CRIT ICISMS
− XML, we don’t like it
− POM is too verbose
− POM v4 didn’t evolve last 5 years − When will you add new common attributes to ease plugins
configuration (encoding …) − New feature like global exclusions
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POM
− No change in POM syntax for 3.0.x
− Changes will occur in 3.x versions − New model with a new version − Only new things − Generation / deployment of 4.0.0 current POM to keep backward
compatibility with old versions
− Mixins to allow to import POM fragments
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Tesla W H AT I S I T ?
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WHAT! YOU FORKED APACHE MAVEN?
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A FORK OF APACHE MAVEN ?
− “The build portion of Tesla are extensions to Maven. The small differences in the core I currently have will be contributed back.” - Jason van Zyl
− “It’s fork as long as Apache Maven core differences aren’t proposed to be contributed back AND validated by the Apache Maven team” – Arnaud and others Apache Maven members
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WHAT IS TESLA ?
− A new project leaded by Jason Van Zyl
− Sources are on Github : https://github.com/etesla
− License : Eclipse Public License v1.0
− “It is not just about builds. Build, IDE, CI, repository management and provisioning.” - Jason Van Zyl
− It is a set of extensions on top of existing tools : Apache Maven, M2E, Nexus, Hudson, …
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FEATURES
− Local repository: − Concurrent Local Repository − Automatic Local Snapshot Purging − Split Local Repository
− Polyglot Support
− development: − Java 5 Annotation-based API − JSR-330 (DI) Components in Plugins
− Build Avoidance API
− Several New Extension Points
− TeslaShell
− More to come!
In Apache since few weeks too
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AUTOMATIC LOCAL SNAPSHOT PURGING
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POLYGLOT SUPPORT
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TESLA SHELL
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TESLA SHELL
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Thank You Q U E S T I O N S ?
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LICENCE ET COPYRIGHTS
− Photos and logos belong to their respective authors/owners
− Various ideas are coming from the excellent presentation done by Matthew McCullough : − http://www.slideshare.net/matthewmccullough/maven-30-at-oredev
− Tesla details are coming from Anders Hammar’s presentation for Jfocus 2012 − http://goo.gl/XNPpQ
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LICENCE ET COPYRIGHTS
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