s new in maven 3 - jazoon

Maven 3.0What’s new in

by Matthew McCullough, Ambient Ideas, LLC

Wednesday, June 2, 2010

In the beginner’s mind there aremany possibilities.

In the expert’s mind there are few.

This Talk

Maven and You

!Who will enjoy this talk?!Current Maven user!Familiar with POM syntax!Interested in preparing for Maven 3.0!Comfortable with betas

TheRoadmap

Compatibility!Tested against 100s of Maven 2 projects!Legacy simulation layers!Using for 6 months almost exclusively

!450+ integration tests

Speed!Performance tuned!Benchmarks

! Disk I/O! Network I/O! CPU! Memory

Maven Speed Test

Quick! Faster execution! 10% faster in the demo

! Multi-threaded downloads! Parallel plugin execution! Java 5 optimized builds

Efficient! Memory conservative! 73% less in the demo

! Tuned data structures

!Largely re-written for quality, flexibility!30% smaller code base!Continuous integration running test suite

Extensibility!Layers of abstraction!Plugin classloader partitioning!Plexus to Guice IOC rewrite!Fully embeddable

!Basis for derived tools

How can you keep up with Maven 3?

http://maven.apache.org/release-notes-3.0.x.html

http://delicious.com/matthew.mccullough/maven

POMs & Maven 3.0

POM XML Syntax

! No POM syntax changes for Maven 3.0

<project> <modelVersion>4.0.0</modelVersion> <groupId>com.ambientideas</groupId> <artifactId>sample-barestbones</artifactId> <version>1.0-SNAPSHOT</version></project>

POM XML Validations

! Heavily validated against common mistakes

! Forward-test with Maven 3.0!Switch back to 2.x for production

! 3.0 POMs run better on 2.x

POM XML Validations

!Warns when plugin versions are not specified

POM XML Validations

! Blocks duplicate dependencies!Examined in same POM only!Conflict resolution used otherwise

<dependency> <artifactId>junit</modelVersion> <groupId>junit</groupId> <version>3.8.1</version></dependency>...<dependency> <artifactId>junit</modelVersion> <groupId>junit</groupId> <version>3.8.2</version></dependency>

“Duplicate dependency” error

Help URLs

! Wiki page URLs now shown for all error messages

Help URLs

! Wiki page URLs now shown for all error messages

Parent POM References

! Parent POMs now prefer to resolve from repositories!Better consistency on multi-module builds

! Version-less parent references will be allowed (not quite ready)

!Will require <relativePath> tag

<project> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.ambientideas</groupId> <artifactId>sample-multimodulejava-parent</artifactId> <version>1.0-SNAPSHOT</version> </parent></project>

<project> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.ambientideas</groupId> <artifactId>sample-multimodulejava-parent</artifactId> <relativePath>../</relativePath> </parent></project>

Profiles Consolidated

•Profiles.xml external file support removed

•Folded into pom.xml

•Already a best-practice

•Necessary for Polyglot Maven

Artifact Behavior Changes

Maven 1.0 Deprecated

• Maven 1.0 repository support removed<layout>legacy</layout>

SNAPSHOT Datestamps

•Deprecated <uniqueVersion> false </uniqueVersion>

•SNAPSHOTs now always deployed with date-stamps

Artifact Resolution Caching•Caches lookups whether found or missing

•Stored in:~/.m2/repo/.../<artifact>.lastUpdated

•Sample contents:#Last modified on: Thu Dec 31 10:42:13 MST 2009#Thu Dec 31 10:42:13 MST 2009http\://localhost\:8081/nexus/content/groups/public=12333938

•Overridden by:mvn <phase> -U

Plugin Behavior Changes

Core Changes: Plugins!Plugin version auto-selection favors RELEASEs over SNAPSHOTs

!Affects command-line invocation of plugins

#Maven 2.x#Will run the newest SNAPSHOT, if one is cached locallymvn archetype:generate#...actually running

mvn org.apache.maven.plugins:maven-archetype-plugin:1.0-SNAPSHOT:generate

#Maven 3.x#Will always run the newest RELEASE in Maven 3.xmvn archetype:generate#...actually running

mvn org.apache.maven.plugins:maven-archetype-plugin:2.0:generate

Command Line

Core Changes: Plugins!Plugins versions cannot be specified as RELEASE or LATEST

!Affects pom.xml configuration and command line fully-qualified invocation

...<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-toolchains-plugin</artifactId> <version>LATEST</version></plugin>...

pom.xml

...<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-toolchains-plugin</artifactId> <version>LATEST</version></plugin>...

pom.xml

Core Changes: Plugins!Plugins only resolved from <pluginRepository> locations

http://cwiki.apache.org/MAVEN/maven-3x-compatibility-notes.html

toolchainWednesday, June 2, 2010

What is toolchain?

!Single configuration for multiple plugins!Primarily supports JDK selection today!Extensible for other tools in the future

Toolchain Config

!User tool definitions in file~/.m2/toolchains.xml

!Maven 3.0 command-line path specification!-t <toolchainspath>!--toolchains <toolchainspath>

<?xml version="1.0" encoding="UTF8"?><toolchains> <toolchain> <type>jdk</type> <provides> <version>1.5</version> <vendor>apple</vendor> <id>default</id> </provides> <configuration> <jdkHome>/System/Library/Frameworks/JavaVM.framework/Versions/1.5</jdkHome> </configuration> </toolchain> <toolchain> <type>jdk</type> <provides> <version>1.6</version> <vendor>apple</vendor> <id>onesixjdk</id> </provides> <configuration> <jdkHome>/System/Library/Frameworks/JavaVM.framework/Versions/1.6</jdkHome> </configuration> </toolchain></toolchains>

toolchains.xml

Using Toolchain

!Implemented as a Maven plugin!Add to <plugins> in pom.xml

!Plugin <configuration> specifies a toolchain to use!Toolchain specified by vendor and version

...<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-toolchains-plugin</artifactId> <version>1.0</version> <executions> <execution> <phase>validate</phase> <goals> <goal>toolchain</goal> </goals> </execution> </executions> <configuration> <toolchains> <jdk> <version>1.5</version> <vendor>apple</vendor> </jdk> </toolchains> </configuration></plugin>...

pom.xml

How does it work?

!Toolchain-enabled plugins read toolchain config first

!Plugins fall back to traditional per-plugin config if toolchain config not found

Benefits

!Minimizes plugin configuration!Separates JDK selection from Maven core

mvnshellWednesday, June 2, 2010

http://shell.sonatype.org/

What is mvnshell?

!High performance console!Maven 3.x add-on

Speed of Builds

Performance of Shell

!220% faster in the demo!No JVM warm-up time!Strategies for caching

polyglotWednesday, June 2, 2010

http://polyglot.sonatype.org/

What is polyglot Maven?

!Maven 3 superset!A full distribution of Maven!Enabled by Maven 3 embedding!Multi-language mvn command

What is polyglot Maven?

!POM file converter!translate tool

!Any-to-Any language translation

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.ambientideas</groupId> <artifactId>sample-dependency</artifactId> <packaging>jar</packaging> <version>1.0-SNAPSHOT</version> <name>Sample Project - One Dependency</name> <url>http://github.com/matthewmccullough/maven-training/</url> <dependencies> <dependency> <groupId>junit</groupId> <artifactId>junit</artifactId> <version>3.8.1</version> <scope>test</scope> </dependency> </dependencies></project>

pom.xml

modelVersion: 4.0.0 artifactId: sample-dependencygroupId: com.ambientideasname: Sample Project - One Dependencypackaging: jarurl: http://github.com/matthewmccullough/maven-training/version: 1.0-SNAPSHOT

dependencies:- {artifactId: junit, groupId: junit, optional: false, scope: test, type: jar, version: 3.8.1}

pom.yaml

(defproject main "com.ambientideas:sample-dependency:1.0-SNAPSHOT"

:model-version "4.0.0" :add-default-plugins false :name "Sample Project - One Dependency" :packaging "jar" :url "http://github.com/matthewmccullough/maven-training/" :test-dependencies [["junit:junit:3.8.1"]])

pom.clj

project { m => m.artifactId = "sample-dependency" m.dependency { d => d.artifactId = "junit" d.groupId = "junit" d.optional = false d.scope = "test" d._type = "jar" d.version = "3.8.1" } m.groupId = "com.ambientideas" m.modelVersion = "4.0.0" m.name = "Sample Project - One Dependency" m.packaging = "jar" m.url = "http://github.com/matthewmccullough/maven-training/" m.version = "1.0-SNAPSHOT" }

pom.scala

project { modelVersion '4.0.0' groupId 'com.ambientideas' artifactId 'sample-dependency' version '1.0-SNAPSHOT' name 'Sample Project - One Dependency' url 'http://github.com/matthewmccullough/maven-training/' dependencies { dependency { groupId 'junit' artifactId 'junit' version '3.8.1' scope 'test' } }}

pom.groovy

Polyglot DSLs

!A true DSL framework!Maven lifecycle hooks

!Can modify execution plan!Supplement the lifecycle

Polyglot Macros

!Maven-specific macros!Allows for more concise POMs!Groovy polyglot showcasing this

!No freeform scripting (yet)

project { modelVersion '4.0.0' $artifact('com.ambientideas', 'sample-dependency’, '1.0-SNAPSHOT') name 'Sample Project - One Dependency' url 'http://github.com/matthewmccullough/maven-training/'

dependencies { dependency('junit', 'junit’, '3.8.1', ‘test') }}

pom.groovy with macros

Where did we start from again?

pom.xml

M2EclipseWednesday, June 2, 2010

Upgrading M2Eclipse

!Latest version, 0.10!Code quality improvements!Performance increases!Packaging changes!Two distinct update sites!Core:! ! ! http://m2eclipse.sonatype.org/sites/m2e

!Extensions:! http://m2eclipse.sonatype.org/sites/m2e-extras

Eclipse Versions Supported

!3.4!3.5!3.5.1 !(Recommended)

!3.6!! ! (Beta)

Dependencies

! Visualizes conflicts! Graph and text form

! Dependency resolution tree! Answers “where is X being brought in from?”

Dependencies

! Easy exclusions! Uses Eclipse refactoring engine

Class Search

! Search the entire central repository for! Artifact

! Package

! Classname

! Lucene database! Incremental updates

Class Search

Maven 3.1Wednesday, June 2, 2010

Maven 3.1 POM Changes

! Backwards compatibility by modelVersion! Final identifier TBD for 3.1 POM syntax! Allows 3.1 to read 3.0, 2.0 POMs

<project> <modelVersion>4.0.0</modelVersion> <groupId>com.ambientideas</groupId> <artifactId>sample-barestbones</artifactId> <version>1.0-SNAPSHOT</version></project>

Maven 3.1 POM Changes

!pom.xml syntax changes!Site plugin takes over <reporting>

!“Mixins” for direct dependencies!Sometimes desired over POM inheritance

!Plugin security manager!settings.xml as default implementation

SummaryWednesday, June 2, 2010

Summary•Validations

•Performance

•Compatibility

•Toolchain

•Shell

•Polyglot

•M2Eclipse

Maven 3.0What’s new in

EmailTwitterBlog

Matthew McCulloughmatthewm@ambientideas.com@matthewmccullhttp://ambientideas.com/blog

ReferencesWednesday, June 2, 2010

!Maven 3 Core! Homepage

! http://maven.apache.org/

! Source Code! http://svn.apache.org/viewvc/maven/maven-3/trunk

! Wiki! http://cwiki.apache.org/MAVEN/maven-3x.html

! Bug Tracking! http://jira.codehaus.org/browse/MNG

! Compatibility! http://cwiki.apache.org/MAVEN/maven-3x-compatibility-notes.html

! Blog Posts! http://www.sonatype.com/people/2009/11/maven-3x-paving-the-desire-lines-

part-two/

! Bookmarks! http://delicious.com/matthewmccullough/maven

!Maven 3 Site Plugin!Source Code! https://svn.apache.org/repos/asf/maven/plugins/branches/

maven-site-plugin-3.x/

!Wiki! http://cwiki.apache.org/MAVEN/maven-3x-and-site-plugin.html

!Maven Shell!Source Code! http://github.com/sonatype/mvnsh/

!Wiki! https://docs.sonatype.org/display/MVNSH

!Homepage! http://shell.sonatype.org/

!Polyglot Maven!Homepage! http://polyglot.sonatype.org/

!Source Code! http://github.com/sonatype/polyglot-maven

!Wiki! https://docs.sonatype.org/display/PMAVEN/

!Groovy Macros! https://docs.sonatype.org/display/PMAVEN/Groovy

!M2Eclipse!Homepage! http://m2eclipse.sonatype.org/

!Update Sites! http://m2eclipse.sonatype.org/sites/m2e! http://m2eclipse.sonatype.org/sites/m2e-extras

s new in maven 3 - jazoon

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