Maven 3.0 at Øredev
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This document provides an overview of new features and changes in Maven 3.0, including improved compatibility, speed, efficiency and extensibility compared to previous versions. It discusses updates to the POM format like additional validations and the consolidation of profiles. New capabilities in Maven 3.0 include parallel builds, artifact resolution caching, and changes to plugin behavior. The document also introduces mvnshell and polyglot Maven, which expand the Maven command-line and allow projects to use alternative DSLs.
![(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](https://image.slidesharecdn.com/maven3-0v0-2-2atoredev-101112093746-phpapp01/85/Maven-3-0-at-Oredev-97-320.jpg)
Maven 3.0 at Øredev
- 1. Maven 3.0 What’s new in by Matthew McCullough, Ambient Ideas, LLC
- 2. In the beginner’s mind there are many possibilities. In the expert’s mind there are few.
- 3. In the beginner’s mind there are many possibilities. In the expert’s mind there are few.
- 4. This Talk
- 5. 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
- 6. Maven and Me ❖ Tenure ❖ Using it for 8 years since 0.7 ❖ Contributing to the codebase via patches ❖ Authoring archetypes ❖ 30 open source how-to projects
- 7. Maven and Me ❖ Tenure ❖ Using it for 8 years since 0.7 ❖ Contributing to the codebase via patches ❖ Authoring archetypes ❖ 30 open source how-to projects ❖ Mentoring ❖ 3 virtual Sonatype classes a month ❖ Several on-site classes around the globe per year ❖ 30+ global conference and user group talks to date ❖ 50+ enterprise Maven-consulting clients
- 8. Maven and Me ❖ Tenure ❖ Using it for 8 years since 0.7 ❖ Contributing to the codebase via patches ❖ Authoring archetypes ❖ 30 open source how-to projects ❖ Mentoring ❖ 3 virtual Sonatype classes a month ❖ Several on-site classes around the globe per year ❖ 30+ global conference and user group talks to date ❖ 50+ enterprise Maven-consulting clients ❖ Writing ❖ O’Reilly: Maven The Definitive Guide by Tim O’Brien ❖ Promotional materials, testimonial on the back cover ❖ DZone Maven RefCard ❖ 8th most-downloaded card of all time
- 9. The Roadmap
- 10. 3.0
- 11. Compatibility ❖Tested against 100s of Maven 2 projects ❖Legacy simulation layers ❖Using for 6 months almost exclusively ❖450+ integration tests
- 15. 603!
- 16. Speed ❖Performance tuned ❖Benchmarks ❖ Disk I/O ❖ Network I/O ❖ CPU ❖ Memory
- 17. Maven Speed Test
- 19. Quick ❖ Faster execution ❖ 10% faster in the demo ❖ Multi-threaded downloads ❖ Parallel plugin execution ❖ Java 5 optimized builds
- 22. Efficient ❖ Memory conservative ❖ 73% less in the demo ❖ Tuned data structures
- 23. ❖Largely re-written for quality, flexibility ❖30% smaller code base ❖Continuous integration running test suite Code
- 24. Extensibility ❖Layers of abstraction ❖Plugin classloader partitioning ❖Plexus to Guice IOC rewrite ❖Fully embeddable ❖Basis for derived tools
- 25. How can you keep up with Maven 3?
- 28. POMs & Maven 3.0
- 29. 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>
- 30. 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
- 31. POM XML Validations ❖Warns when plugin versions are not specified
- 32. “Plugin version omitted” warning
- 34. 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>
- 37. Help URLs ❖ Wiki page URLs now shown for all error messages
- 38. Help URLs ❖ Wiki page URLs now shown for all error messages
- 40. Parent POM References ❖ Parent POMs now prefer to resolve from repositories ❖Better consistency on multi-module builds ❖ Version-less parent references may be allowed (not ready yet) ❖Will require <relativePath> tag ❖MNG-624
- 45. Profiles Consolidated •Profiles.xml external file support removed •Folded into pom.xml •Already a best-practice •Necessary for Polyglot Maven
- 46. Parallel Builds
- 47. Parallel Build Approach •Examines reactor build plan •Threads up to what’s possible •Governed by your provided limits
- 49. Parallel Build Syntax •Four threads mvn -T 4 install
- 50. Parallel Build Syntax •Two threads per core mvn -T 2C install
- 51. Serial Building
- 56. Maven 1.0 Deprecated • Maven 1.0 repository support removed <layout>legacy</layout>
- 57. SNAPSHOT Datestamps •Deprecated <uniqueVersion> false </uniqueVersion> •SNAPSHOTs now always deployed with date-stamps
- 58. 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 2009 http://localhost:8081/nexus/content/groups/public=12333938 •Overridden by: mvn <phase> -U
- 60. Core Changes: Plugins ❖Plugin version auto-selection favors RELEASEs over SNAPSHOTs ❖Affects command-line invocation of plugins
- 61. #Maven 2.x #Will run the newest SNAPSHOT, if one is cached locally mvn 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.x mvn archetype:generate #...actually running mvn org.apache.maven.plugins:maven-archetype-plugin:2.0:generate Command Line
- 62. Core Changes: Plugins ❖Plugins versions cannot be specified as RELEASE or LATEST ❖Affects pom.xml configuration and command line fully-qualified invocation
- 65. Core Changes: Plugins ❖Plugins only resolved from <pluginRepository> locations
- 67. Site Plugin ❖Near-complete rewrite ❖Separation of <reporting> from core Maven codebase ❖Preparation for Maven 3.1 pom.xml syntax changes
- 70. Not a technical rant on Maven vs. Ant
- 71. mvnshell
- 76. What is mvnshell? ❖High performance console ❖Maven 3.x add-on
- 77. The shell and its commands
- 81. Speed of Builds
- 83. Performance of Shell ❖220% faster in the demo ❖No JVM warm-up time ❖Strategies for caching
- 86. polyglot
- 90. What is polyglot Maven? ❖Maven 3 superset ❖A full distribution of Maven ❖Enabled by Maven 3 embedding ❖Multi-language mvn command
- 91. What is polyglot Maven? ❖POM file converter ❖translate tool ❖Any-to-Any language translation
- 92. <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
- 93. Translating a POM from XML toYAML
- 95. <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
- 96. modelVersion: 4.0.0 artifactId: sample-dependency groupId: com.ambientideas name: Sample Project - One Dependency packaging: jar url: 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
- 97. (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
- 98. 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
- 99. 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
- 100. Translating a POM and building from it
- 102. Polyglot DSLs ❖A true DSL framework ❖Maven lifecycle hooks ❖Can modify execution plan ❖Supplement the lifecycle
- 103. Polyglot Macros ❖Maven-specific macros ❖Allows for more concise POMs ❖Groovy polyglot showcasing this ❖Freeform scripting in Groovy
- 104. 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
- 105. Where did we start from again?
- 106. <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
- 107. M2Eclipse
- 109. 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
- 111. Dependencies ❖ Visualizes conflicts ❖ Graph and text form ❖ Dependency resolution tree ❖ Answers “where is X being brought in from?”
- 112. Dependency conflicts
- 114. Dependencies ❖ Easy exclusions ❖ Uses Eclipse refactoring engine
- 115. Exclusions
- 117. Class Search ❖ Search the entire central repository for ❖ Artifact ❖ Package ❖ Classname ❖ Lucene database ❖ Incremental updates
- 118. Class Search
- 120. Resources
- 122. Examples ❖Ambient sample projects ❖http://github.com/matthewmccullough/maven-training ❖Sonatype sample projects ❖http://www.sonatype.com/products/maven/ documentation/book-defguide
- 123. Maven 3.1
- 124. Maven 3.1
- 125. 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>
- 126. Maven 3.1 POM Changes ❖pom.xml syntax changes ❖Site plugin takes over <reporting>
- 127. Maven 3.1 POM Changes ❖“Mixins” for direct dependencies ❖Sometimes desired over POM inheritance
- 128. Maven 3.1 POM Changes ❖Plugin security manager ❖settings.xml as default implementation
- 129. Summary
- 131. Maven 3.0 What’s new in Email Twitter Blog Matthew McCullough [email protected] @matthewmccull http://ambientideas.com/blog
- 132. Maven 3.0 What’s new in Email Twitter Blog Matthew McCullough [email protected] @matthewmccull http://ambientideas.com/blog
- 133. References
- 134. ❖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
- 135. ❖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
- 136. ❖Maven Shell ❖ Source Code ❖ http://github.com/sonatype/mvnsh/ ❖ Wiki ❖ https://docs.sonatype.org/display/MVNSH ❖ Homepage ❖ http://shell.sonatype.org/
- 137. ❖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
- 138. ❖M2Eclipse ❖ Homepage ❖ http://m2eclipse.sonatype.org/ ❖ Update Sites ❖ http://m2eclipse.sonatype.org/sites/m2e ❖ http://m2eclipse.sonatype.org/sites/m2e-extras