Lausanne Jug (08th April, 2010) - Maven

Apache Maven – JUG Lausanne – April 8th, 2010 Arnaud Héritier eXo Platform Software Factory Manager

Arnaud Héritier ●  Software Factory Manager eXo platform -  In charge of tools and methods ●  Committer since 2004 and member of the Project Management Committee ●  Coauthor of « Apache Maven » published by Pearson (in French) Licensed under a Creative Commons license ●  http://aheritier.net

Apache Maven CHOOSE YOUR MENU Licensed under a Creative Commons license

Overview ●  Definition ●  Maven or not Maven, that ●  History is the question ! -  Maven, the project choice ●  Concepts -  Maven, the corporate choice -  Conventions -  Competitors -  POM -  Reactor and Modules -  Inheritance -  Artifact Repository -  Dependency -  Version -  Profiles   Build Lifecycle And Plugins Licensed under a Creative Commons license

Ecosystem ●  Repository Managers ●  Continuous Integration ●  Quality Management ●  IDE -  Tests Automation -  Eclipse -  Quality Metrics Reports -  Idea IntelliJ -  Project Reports -  Netbeans -  Sonar Licensed under a Creative Commons license

Good & Bad Practices ●  K.I.S.S. ●  Project Organization ●  POM ●  Development Licensed under a Creative Commons license

Usecases ●  Secure your credentials ●  Build a part of your project using reactor options ●  Automate your release process -  (at least the technical part) ●  Setup a global mirror Licensed under a Creative Commons license

Back to the future ●  Maven 2.x ●  Maven 3.x ●  Community Licensed under a Creative Commons license

Apache Maven OVERVIEW Licensed under a Creative Commons license

Definition ●  Apache Maven is a software project management and comprehension tool. ●  Based on the concept of a project object model (POM) -  Maven can manage a project's build, binaries, reporting and documentation from a central piece of information. Licensed under a Creative Commons license

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. ●  Maven 2.0 released in September 2005 ●  Maven 3.0 … coming soon !!! Licensed under a Creative Commons license

Apache Maven CONCEPTS Licensed under a Creative Commons license 12

Conventions ●  1 project = 1 artifact (pom, jar, war, ear, …) ●  Standardized -  project descriptor (POM) -  build lifecycle -  directories layout ●  *.java to compile in src/[main|test]/java ●  *.xml, *.properties needed in classpath and to bundle in archive in src/[main|test]/resources ●  target directory for generated stuffs (sources, classes, …) ●  … Licensed under a Creative Commons license 13

POM ●  An XML file (pom.xml) <?xml version="1.0" encoding="UTF-8"?>! <project>! <modelVersion>4.0.0</modelVersion>! ●  Describing <groupId>net.aheritier.samples</groupId>! <artifactId>simple-webapp</artifactId>! -  Project identification <version>1.1-SNAPSHOT</version>! <packaging>war</packaging>! -  Project version <name>Simple webapp</name>! -  Project description <inceptionYear>2007</inceptionYear>! <dependencies>! -  Build settings <dependency>! <groupId>org.springframework</groupId>! -  Dependencies <artifactId>spring-struts</artifactId>! -  … <version>2.0.2</version>! </dependency>! ...! </dependencies>! </project>! Licensed under a Creative Commons license

Reactor ●  Split your project in <project>! sub-modules ...! <modules>! ●  Maven computes the <module>moduleA</module>! build order from <module>moduleB</module>! dependencies <module>moduleC</module>! between sub- <module>moduleD</module>! modules. <module>moduleE</module> ! ●  Modules have to be <module>moduleF</module>! defined in the POM </modules>! ...! -  No auto-discovery for </project>! performance reasons Licensed under a Creative Commons license

Inheritance ●  Share settings between projects/modules ●  By default the parent project is supposed to be in the parent directory (../) <parent>! <groupId>net.aheritier.sample</groupId>! <artifactId>my-parent</artifactId>! <version>1.0.0-SNAPSHOT<version>! </parent>! Licensed under a Creative Commons license

Inheritance Use a technical inheritance to organize sub-modules Use assembly to package batchs Insert README in all artifacts Use clirr to validate backward compatibility Licensed under a Creative Commons license

Artifact Repository ●  By default : -  A central repository ●  http://repo1.maven.org/ maven2 ●  Several dozen of Gb of OSS libraries -  A local repository ●  ${user.home}/.m2/repository ●  All artifacts -  Used by maven and its plugins -  Used by your projects (dependencies) -  Produced by your projects Licensed under a Creative Commons license

Artifact Repository ●  By default Maven downloads artifacts required by the project or itself from central ●  Downloaded artifacts are stored in the local repository ●  Used to store : -  Project’s binaries -  Project’s dependencies -  Maven and plug-ins binaries Licensed under a Creative Commons license

Dependencies Without Maven With Maven Licensed under a Creative Commons license

Dependencies ●  Declaratives -  groupId + artifactId + version (+ classifier) -  Type (packaging) : jar, war, pom, ear, … ●  Transitives -  Lib A needs Lib B -  Lib B needs Lib C -  Thus Lib A needs Lib C Licensed under a Creative Commons license

Dependencies ●  Scope -  Compile (by default) : Required to build and run the application -  Runtime : not required to build the application but needed at runtime ●  Ex : taglibs -  Provided : required to build the application but not needed at runtime (provided by the container) ●  Ex : Servlet API, Driver SGBD, … -  Test : required to build and launch tests but not needed by the application itself to build and run ●  Ex : Junit, TestNG, DbUnit, … -  System : local library with absolute path ●  Ex : software products Licensed under a Creative Commons license

Dependencies ●  Define all dependencies you are using -  and no more ! ●  If you have optional dependencies -  Perhaps you should have optional modules instead ●  Cleanup your dependencies with -  mvn dependency:analyze! ●  Study your dependencies with -  mvn dependency:tree! -  mvn dependency:list! Licensed under a Creative Commons license

Versions ●  Project and dependency versions ●  Two different version variants   SNAPSHOT version ●  The version number ends with –SNAPSHOT ●  The project is in development ●  Deliveries are changing over the time and are overridden after each build ●  Artifacts are deployed with a timestamp on remote repositories   RELEASE version ●  The version number doesn’t end with –SNAPSHOT ●  Binaries won’t change Licensed under a Creative Commons license

Versions Licensed under a Creative Commons license

Versions ●  About SNAPSHOT dependencies -  Maven allows the configuration of an update policy. The update policy defines the recurrence of checks if there is a new SNAPSHOT version available on the remote repository : ●  always ●  daily (by default) ●  interval:X (a given period in minutes) ●  never -  Must not be used in a released project ●  They can change thus the release also  ●  The release plugin will enforce it  Licensed under a Creative Commons license

Versions ●  Range -  From … to … -  Maven automatically searches for the corresponding version (using the update policy for released artifacts) -  To use with caution ●  Risk of non reproducibility of the build ●  Risk of side effects on projects depending on yours. Licensed under a Creative Commons license

Versions ●  Use the versions plugin to update all versions of your project and its modules mvn versions:set –DnewVersion=A.B.C-SNAPSHOT! Licensed under a Creative Commons license

Profiles ●  Allow to modify the default behavior of Maven by overriding/adding some settings ●  Use mvn help:active-profiles to debug ●  Explicit activation or deactivation mvn <phases or goals> ! -PprofileId1,-profileId2 ! -P!profileId3! Licensed under a Creative Commons license

Profiles ●  activeByDefault = If no other profile is activated ●  Activation through Maven settings <settings>! ...! <activeProfiles>! <activeProfile>profile-1</activeProfile>! </activeProfiles>! ...! </settings>! Licensed under a Creative Commons license

Profiles ●  Activation based on environment variables <profiles>! <profiles>! <profile>! <profile>! <activation>! <activation>! <property>! <property>! <name>run-its</name>! <name>!skip-enforce</name>! <value>true</value>! </property>! </property>! </activation>! </activation>! ...! ...! </profile>! </profile>! </profiles>! </profiles>! Licensed under a Creative Commons license

Profiles ●  OS / Java settings <profiles>! <profile>! <profiles>! <activation>! <os>! <profile>! <name>Windows XP</name>! <activation>! <family>Windows</family>! <jdk>[1.3,1.6)</jdk>! <arch>x86</arch>! </activation>! <version>5.1.2600</version>! ...! </os>! </profile>! </activation>! </profiles>! ...! </profile>! </profiles>! Licensed under a Creative Commons license

Profiles ●  Activation on present or missing files <profiles>! <profile>! <activation>! <file>! <missing>${project.build.directory}/generated-sources/ axistools/wsdl2java/</missing>! </file>! </activation>! ...! </profile>! </profiles>! Licensed under a Creative Commons license

Build Lifecycle And Plugins ●  Plugin based architecture for a great extensibility ●  Standardized lifecycle to build all types of archetypes Licensed under a Creative Commons license

Build Lifecycle And Plugins Default Lifecycle Clean Lifecycle Site Lifecycle validate pre-clean pre-site initialize clean site generate-sources post-clean post-site process-sources site-deploy generate-resources process-resources compile process-classes generate-test-sources process-test-sources generate-test-resources process-test-resources test-compile process-test-classes test prepare-package package pre-integration-test integration-test post-integration-test verify install deploy Licensed under a Creative Commons license

Build Lifecycle And Plugins ●  Many plugins -  Packaging -  Reporting -  IDE integration -  Miscellaneous tools integration ●  Many locations -  maven.apache.org -  mojo.codehaus.org -  code.google.com -  … Licensed under a Creative Commons license

Apache Maven MAVEN OR NOT MAVEN, THAT IS THE QUESTION ! Licensed under a Creative Commons license

Maven, the project’s choice ●  Application’s architecture -  The project has the freedom to divide the application in modules -  Maven doesn’t limit the evolution of the application architecture ●  Dependencies management -  Declarative : Maven automatically downloads them and builds the classpath -  Transitive : We define only what the module needs itself Licensed under a Creative Commons license

Maven, the project’s choice ●  Centralizes and automates -  Builds all development facets -  Tests (build, tests, releases) -  Packages ●  One thing it cannot do for -  Deploys you : to develop  -  Documents -  Checks and reports about the quality of developments Licensed under a Creative Commons license

Maven, the corporate’s choice ●  Widely adopted and known -  Many developers ●  Developments are standardized ●  Decrease of costs -  Reuse of knowledge -  Reuse of configuration fragments -  Reuse of process and code fragments ●  Product quality improvement -  Reports and monitoring Licensed under a Creative Commons license

Competitors ●  Ant + Ivy, Easy Ant, Gant, Gradle, Buildr… ●  Script oriented -  You can do what you want ! ●  Reuse many of Maven 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 Maven 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 public API  Licensed under a Creative Commons license

With scripts oriented builds You can have But often you have (if you have good skills) (moreover after years …) Licensed under a Creative Commons license

With Maven We dream to deliver But today we have too often (Maven 3.x) (Maven 2.x) Licensed under a Creative Commons license

Apache Maven ECOSYSTEM Licensed under a Creative Commons license

Maven’s ecosytem ●  Maven alone is nothing ●  You can integrate it with many tools -  A large set of plug-ins is already available -  You can define your own plug-ins Licensed under a Creative Commons license

Apache Maven REPOSITORY MANAGERS Licensed under a Creative Commons license

Repository Managers ●  Several products ●  Basic services -  Sonatype Nexus (replaced -  Search artifacts Proximity) -  Browse repositories -  Jfrog Artifactory -  Proxy external repositories -  Apache Archiva -  Host internal repositories -  Security Licensed under a Creative Commons license

Secure your builds ●  Deploy a repository manager to proxy externals repositories to : -  Avoid external network outages -  Avoid external repository unavailabilities -  To reduce your company’s external network usage -  To increase the speed of artifact downloads ●  Additional services offered by such servers : -  Artifacts procurement to filter what is coming from the outside -  Staging repository to validate your release before deploying it Licensed under a Creative Commons license

Nexus at eXo for productivity Licensed under a Creative Commons license

Nexus at eXo for collaboration ●  Deploy 3rd Party Artifacts ●  Collaborate with Internal Repositories ●  Distribute to the community with Public Repositories ●  Distribute to customers with Private Repositories Licensed under a Creative Commons license

Nexus at eXo for quality ●  Ease the Burden on Central and others remote repositories ●  Gain Predictability and Scalability ●  Control and Audit Dependencies and Releases ●  Stage releases Licensed under a Creative Commons license

Apache Maven QUALITY MANAGEMENT Licensed under a Creative Commons license

Tests Automation ●  Use automated tests as often as you can ●  Many tools are available through Maven -  JUnit, TestNG – unit tests, -  Selenium, Canoo – web GUI test, -  Fitnesse, Greenpepper – functional tests, -  SoapUI – web services tests -  JMeter – performances tests -  And many more frameworks are available to reply your needs Licensed under a Creative Commons license

Quality Metrics ●  Extract quality metrics from your project and monitor them : -  Code style (CheckStyle) -  Bad practices or potential bugs (PMD, FindBugs, Clirr) -  Tests coverage (Cobertura, Emma, Clover) -  … ●  You can use blocking rules -  For example, I break the build if the upward compatibility of public APIs is broken ●  You can use reports -  Reports are available in a web site generated by Maven -  Or in a quality dashboard like Sonar Licensed under a Creative Commons license

Dependency Report Licensed under a Creative Commons license

Sonar, a quality dashboard Licensed under a Creative Commons license

Sonar, analyze your project Licensed under a Creative Commons license

Sonar, Continuous Improvement ? Licensed under a Creative Commons license

Apache Maven CONTINUOUS INTEGRATION Licensed under a Creative Commons license

Continuous Integration ●  Setup a continuous integration server to : -  Have a neutral and unmodified environment to run your tests -  Quickly react when ●  The build fails (compilation failure for example) ●  A test fails ●  A quality metric is bad -  Continuously improve the quality of your project and your productivity ●  Many products -  Hudson, Bamboo, TeamCity, Continuum, Cruisecontrol, … Licensed under a Creative Commons license

Hudson, how the weather is ? Licensed under a Creative Commons license

Hudson : build, test, check Licensed under a Creative Commons license

Apache Maven IDE Licensed under a Creative Commons license

Eclipse ●  Integration from maven (eclipse:eclipse) -  Allow many customizations -  Support many versions/variants of eclipse -  Support many usages (ear …) -  Doesn’t support projects with “pom” packaging -  Few support from dev team -  Many bugs in classpath management -  Asynchronous ●  You have to regenerate and reload project each time you change a POM) Licensed under a Creative Commons license

Eclipse ●  Integration from eclipse (m2eclipse) -  Synchronous -  Nice UI and services to edit POMs -  Support projects with “pom” packaging -  Doesn’t support all usages like EAR with WTP -  Doesn’t support very well a large number of modules -  Slow down eclipse on large projects because of a lack of support of incremental build in Maven 2.x and its plugins Licensed under a Creative Commons license

Eclipse (m2eclipse) Licensed under a Creative Commons license

Idea IntelliJ Licensed under a Creative Commons license

Netbeans Licensed under a Creative Commons license

Apache Maven GOOD & BAD PRACTICES Licensed under a Creative Commons license

Apache Maven KISS Licensed under a Creative Commons license

K.I.S.S. ●  Keep It Simple, Stupid ●  Start from scratch -  Do not copy/paste what you find without understanding ●  Use only what you need -  It’s not because maven offers many features that you need to use them ●  Filtering ●  Modules ●  Profiles ●  … Licensed under a Creative Commons license

Apache Maven PROJECT ORGANIZATION GOOD & BAD PRACTICES Licensed under a Creative Commons license

Project bad practices ●  Ignore Maven conventions -  Except if your are migrating from something else and the target has to be to follow them. -  Except if they are not compatible with your IDE ●  Different versions in sub-modules -  In that case they are standalone projects. ●  Too many inheritance levels -  It makes the POMs maintenance more complex -  Where should I set this plugin parameter ? In which parent ? Licensed under a Creative Commons license

Project bad practices ●  Have too many modules -  Is there a good reason ? ●  Technical constraint ? ●  Team organization ? -  It increases the build time ●  Many more artifacts to generate ●  Dependencies resolution more complex -  It involves more complex developments ●  More modules to import in your IDE ●  More modules to update … Licensed under a Creative Commons license

Project good practices ●  Use the default inheritance : -  The reactor project is also the parent of its modules. -  Configuration is easier : ●  No need to redefine SCM settings, site distribution settings … Licensed under a Creative Commons license

Apache Maven POM GOOD & BAD PRACTICES Licensed under a Creative Commons license

POM bad practices ●  Dependencies : -  DON’T confuse dependencies and dependencyManagement ●  Plugins : -  DON’T confuse plugins and pluginManagement -  DON’T use AntRun plugin everywhere -  DON’T let Maven choose plugins versions for you Licensed under a Creative Commons license

POM bad practices ●  Profiles : -  DON’T create environment dependant builds -  DON’T rely on dependencies coming from profiles (there is no transitive activation of profiles) ●  Reporting and quality -  DON’T activate on an existing project all reports with default configuration -  DON’T control formatting rules without giving settings for IDEs. ●  DON’T put everything you find in your POM. Licensed under a Creative Commons license

POM good practices ●  Set versions of dependencies in project parent’s dependencyManagement ●  Set dependencies (groupId, artifactId, scope) in each module they are used ●  Use the dependency plugin (from apache) and versions plugin (from mojo) to analyze, cleanup and update your dependencies. Licensed under a Creative Commons license

Apache Maven DEVELOPMENT GOOD & BAD PRACTICES Licensed under a Creative Commons license

Development bad practices ●  DON’T spend your time in the terminal, ●  DON’T exchange libraries through emails, ●  DON’T always use "-Dmaven.test.skip=true” ●  DON’T manually do releases Licensed under a Creative Commons license

Development good practices ●  Keep up-to-date your version of Maven -  For example in 2.1 the time of dependencies/modules resolution decreased a lot (Initialization of a project of 150 modules passed from 8 minutes to less than 1) ●  Use the reactor plugin (Maven < 2.1) or native reactor command line options (Maven >= 2.1) to rebuild only a subpart of your project : -  All modules depending on module XXX -  All modules used to build XXX ●  Try to not use Maven features not supported by your IDE (resources filtering with the plugin eclipse:eclipse) Licensed under a Creative Commons license

Apache Maven USECASES Licensed under a Creative Commons license

Apache Maven SECURE YOUR CREDENTIALS Licensed under a Creative Commons license

Secure your credentials ●  Generate a private key -    arnaud@leopard:~$ mvn --encrypt-master-password toto  {dZPuZ74YTJ0HnWHGm4zgfDlruYQNda1xib9vAVf2vvY=}  ●  We save the private key in ~/.m2/settings-security.xml <settingssecurity>! <master>{dZPuZ74YTJ0HnWHGm4zgfDlruYQNda1xib9vAVf2vvY=}</master>! </settingssecurity>! Licensed under a Creative Commons license

Secure your credentials ●  You can move this key to another drive ~/.m2/settings.xml -  <settingsSecurity>  <relocation>/Volumes/ArnaudUsbKey/secure/settings-security.xml</relocation>  </settingsSecurity>! ●  You create an encrypted version of your server password -  arnaud@mbp-arnaud:~$ mvn --encrypt-password titi {SbC9Fl2jA4oHZtz5Fcefp2q1tMXEtBkz9QiKljPiHss=}! ●  You register it in your settings -  <settings>  ...  <servers>  ...  <server>  <id>mon.server</id>  <username>arnaud</username>  <password>{SbC9Fl2jA4oHZtz5Fcefp2q1tMXEtBkz9QiKljPiHss=}</password>  </server>  ...  </servers>  ...  </settings>! Licensed under a Creative Commons license

Apache Maven BUILD A PART OF YOUR PROJECT Licensed under a Creative Commons license

Using Reactor Options ●  Options added in maven 2.1 ●  Available in 2.0.x with the maven-reactor-plugin -  But syntax is longer ●  Allow to control what you want to build in your project Licensed under a Creative Commons license

Using Reactor Options -  arnaud@mbp-arnaud:~$ mvn install  [INFO] ------------------------------------------------  [INFO] Reactor Summary:  [INFO]  [INFO] Project ....................... SUCCESS [2.132s]  [INFO] ModuleA ....................... SUCCESS [5.574s]  [INFO] ModuleB ....................... SUCCESS [0.455s]  [INFO] ModuleC ....................... SUCCESS [0.396s]  [INFO] ModuleD ....................... SUCCESS [0.462s]  [INFO] ModuleE ....................... SUCCESS [0.723s]  [INFO] ModuleF ....................... SUCCESS [0.404s] ! ●  Builds everything from A to F Licensed under a Creative Commons license

Using Reactor Options -  arnaud@mbp-arnaud:~$ mvn install –pl moduleE,moduleB  [INFO] -------------------------------------------  [INFO] Reactor Summary:  [INFO]  [INFO] ModuleB .................. SUCCESS [2.774s]  [INFO] ModuleE .................. SUCCESS [1.008s]  ●  Builds only modules B and E ●  Following dependencies order ●  -pl --project-list: Build the specified reactor projects instead of all projects Licensed under a Creative Commons license

Using Reactor Options -  arnaud@mbp-arnaud:~$ mvn install –pl moduleD -am  [INFO] ------------------------------------------  [INFO] Reactor Summary:  [INFO]  [INFO] ModuleA ................. SUCCESS [4.075s]  [INFO] ModuleB ................. SUCCESS [0.468s]  [INFO] ModuleC ................. SUCCESS [0.354s]  [INFO] ModuleD ................. SUCCESS [0.384s]  ●  Builds module D (-pl) and all modules it uses as dependencies ●  -am --also-make: If a project list is specified, also make projects that the list depends on ●  Usecase : Build all modules required for a war, ear, … Licensed under a Creative Commons license

Using Reactor Options -  arnaud@mbp-arnaud:~$ mvn install –pl moduleD -amd  [INFO] ------------------------------------------  [INFO] Reactor Summary:  [INFO]  [INFO] ModuleD ................. SUCCESS [4.881s]  [INFO] ModuleE ................. SUCCESS [0.478s]  [INFO] ModuleF ................. SUCCESS [0.427s]  ●  Builds module D (-pl) and all modules which depend on it ●  -amd --also-make-dependents: If a project list is specified, also make projects that depend on projects on the list ●  Usecase : Check that a change in a module didn’t break others which are using it Licensed under a Creative Commons license

Using Reactor Options -  arnaud@mbp-arnaud:~$ mvn install –rf moduleD  [INFO] ------------------------------------------  [INFO] Reactor Summary:  [INFO]  [INFO] ModuleD ................. SUCCESS [9.707s]  [INFO] ModuleE ................. SUCCESS [0.625s]  [INFO] ModuleF ................. SUCCESS [0.679s] [INFO] Project ................. SUCCESS [2.467s]  ●  Restarts all the build from module D (-rf) ●  -rf,--resume-from <arg> : Resume reactor from specified project ●  Usecase : The build failed a 1st time in module D, you fixed it, and restart the build were it was to end it. Licensed under a Creative Commons license

Apache Maven RELEASE YOUR PROJECT Licensed under a Creative Commons license

Release of a webapp in 2002 ●  Limited usage of eclipse -  No WTP (Only some features in WSAD), -  No ability to produce WARs Licensed under a Creative Commons license

Release of a webapp in 2002 ●  Many manual tasks -  Modify settings files -  Package JARs -  Copy libraries (external and internal) in a « lib » directory -  Package WAR (often with a zip command) -  Tag the code (CVS) -  Send the package on the integration server using FTP -  Deploy the package with AS console Licensed under a Creative Commons license

Release of a webapp in 2002 ●  One problem : The are ●  How long did it take ? always problems -  When everything is ok : 15 -  Error in config files minutes -  Missing dependencies -  When there’s a problem : ½ -  Missing file day or more -  Last minute fix which created a bug -  And many other possibilies .. Licensed under a Creative Commons license

Maven Release Plugin ●  Automates the release process from tagging sources to binaries delivery ●  Release plugin main goals: -  Prepare : To update maven versions and information in POMs and tag the code -  Perform : To deploy binaries in a maven repository ●  After that you can just automate the deployment on the AS using cargo for example. Licensed under a Creative Commons license

Maven Release Plugin Licensed under a Creative Commons license

Configuration and Prerequisites ●  Project version (must be a SNAPSHOT version) ●  Dependencies and plugins versions mustn’t be SNAPSHOTs Licensed under a Creative Commons license

Troubleshooting Releases ●  Common errors during release: -  Build with release profile was tested before and fails -  Local modifications -  Current version is not a SNAPSHOT -  SNAPSHOTs in dependencies and/or plugins -  Missing some configuration (scm, distribMgt, …) -  Tag already exists -  Unable to deploy project to the Repository -  Connection problems Licensed under a Creative Commons license

SCM configuration ●  SCM binaries have to be in the PATH ●  SCM credentials have to already be stored or you have to pass them in command line with : –Dusername=XXX –Dpassword=XXX <scm>! <connection>scm:svn:http://svn.acme.com/myproject/trunk</connection>! <developerConnection>scm:svn:https://svn.acme.com/myproject/trunk</developerConnection>! <url>http://fisheye.acme.com/browse/myproject/trunk</url>! </scm>! Licensed under a Creative Commons license

Distribution Management ●  Where you want to upload released binaries ●  The url of a repository dedicated for your project/ corporate maven deliveries in your repository manager <project>! <distributionManagement>! <repository>! <id>repository.acme.com</id>! <url>${acme.releases.repo.url}</url>! This id will be used in user’s </repository>! maven settings . . .! (~/.m2/settings.xml) </distributionManagement>! . . . ! <properties>! <acme.releases.repo.url>http://repo.acme.com/acme-releases</acme.releases.repo.url>! . . .! </properties>! Often useful to have a property </project>! to test the release process on a fake repository, to validate a repo manager ... Licensed under a Creative Commons license

Repository credentials ●  One server entry is required per different repository id in distribution management of projects ●  In a corporate environment, use a unique id for all repositories hosted on repository managers using same credentials (corporate LDAP …) <settings>! ...! <servers>! <server>! <id>repository.acme.com</id>! <username>aheritier</username>! This id is the one defined in <password>{ABCDEFGHIJKLMNOPQRSTUVWYZ}</password>! distributionManagement entry of </server>! the project to release ...! </servers>! ...! </settings>! Licensed under a Creative Commons license

Default Release Profile in Super POM ●  This profile is used when you generate binaries of the release with “mvn release:perform” ●  By default, generates sources and javadocs jars for each module. <profile>! <id>release-profile</id>! <activation>! <property>! <name>performRelease</name>! <value>true</value>! This activation could be used in </property>! profiles you want to activate in </activation>! the release process <build>! <plugins>! ...! </plugins>! Configuration to generate </build>! sources and javadoc jars with </profile>! basic setting Licensed under a Creative Commons license

Custom release profile <project>! ...! <build>! <pluginManagement>! <plugins>! <plugin>! <groupId>org.apache.maven.plugins</groupId>! <artifactId>maven-release-plugin</artifactId>! <version>2.0</version>! <configuration>! <useReleaseProfile>false</useReleaseProfile>! <releaseProfiles>myreleaseprofile</releaseProfiles>! Don’t use the default profile </configuration>! </plugin>! </plugins>! Use our customized profile </pluginManagement>! </build>! ...! <profiles>! <profile>! <id>myreleaseprofile</id>! <build>! ...! Our customized profile </build>! </profile>! Customize the behavior of </profiles>! the build for a release ...! Take care to test is before </project>! the release !! Licensed under a Creative Commons license

Apache Maven SETUP A GLOBAL MIRROR Licensed under a Creative Commons license

Why should we setup a global mirror ? ●  To simplify users and projects settings ●  To control where binaries are coming from -  To not rely on project’s repositories -  To use only the corporate repository manager ●  To improve build performances -  By reducing the number of requests to find a missing artefact Licensed under a Creative Commons license

How should we setup a global mirror ? <setting>  <mirrors>  <mirror>  <id>global-mirror</id>  <mirrorOf>external:*</mirrorOf>  <url>http://repo.acme.com/public</url>  </mirror>  Send all requests to this url </mirrors>  <profiles>  <profile>  <id>mirror</id>  <repositories>  <repository>  <id>central</id>  <url>http://central</url>  <releases><enabled>true</enabled></releases>  Use « central » id to override <snapshots><enabled>true</enabled></snapshots>  default maven configuration </repository>  </repositories>  Enable snapshots <pluginRepositories>  <pluginRepository>  <id>central</id>  <url>http://central</url>  <releases><enabled>true</enabled></releases>  <snapshots><enabled>true</enabled></snapshots>  </pluginRepository>  </pluginRepositories>  </profile>  </profiles>  <activeProfiles>  <activeProfile>mirror</activeProfile>  </activeProfiles>  </settings> ! make the profile active all the time Licensed under a Creative Commons license

Apache Maven BACK TO THE FUTURE Licensed under a Creative Commons license

Apache Maven PRODUCT Licensed under a Creative Commons license

Apache Maven 2.0.x ●  bugs fix ●  Last release : 2.0.11 ●  No other release of 2.0.x in the future Licensed under a Creative Commons license

Apache Maven 2.x ●  Evolutions, new features ●  Several important new features in 2.1 like -  Parallel downloads -  Encrypted passwords -  Reactor command line options ●  Last release : 2.2.1 Licensed under a Creative Commons license

Apache Maven 3.x ●  Do not be afraid !!!!! ●  Full compatibility with maven 2.x projects -  Or at least at 99,99999% ●  Availability in 2010 (2nd half) ●  Why Maven 3.X ? -  To build new foundations for the future -  The major part of the code was reviewed / rewritten ●  How POMs are constructed ●  How the lifecycle is executed ●  How the plugin manager executes ●  How artifacts are resolved ●  How it can be embedded ●  How dependency injection is done ●  … Licensed under a Creative Commons license

Apache Maven 3.x - robustness ●  Error & integrity reporting -  Much improved error reporting where we will provide links to each identifiable problem we know of. There are currently 42 common things that can go wrong. -  Don't allow builds where versions come from non- project sources like local settings and CLI parameters -  Don't allow builds where versions come from profiles that have to be activated manually ●  Backward compatibility -  Several thousands of integration tests Licensed under a Creative Commons license

Apache Maven 3.x - performances ●  Many optimizations ●  New support of parallel builds of modules ●  New incremental (partial) build -  To improve IDE integration Licensed under a Creative Commons license

Apache Maven 3.x – new features ●  Any-source POM -  If you don’t like XML, choose another DSL ●  Versionless parent elements -  If you don’t use versions or release plugins to automatically update them ●  Mixins -  a compositional form of Maven POM configuration ●  Global excludes Licensed under a Creative Commons license

Apache Maven 3.x ●  What it will change for maven developers ? -  Lifecycle extension points -  Plugin extension points -  Incremental build support -  Queryable lifecycle -  Extensible reporting -  Bye bye Plexus, welcome JSR 330 & Google Guice -  Well defined and documented APIs Licensed under a Creative Commons license

Apache Maven 3.x – New tools ●  mvnsh -  A cross-platform shell dedicated to maven ●  Tycho -  Maven ready for OSGI and Eclipse developments Licensed under a Creative Commons license

In Apache Maven 3.0 ? ●  A backward compatibility near to 100% for projects and plugins ●  A totally new implementation -  A greater robustness with a better reporting and more readable logs -  Performances improvements and new parallel builds -  A better integration for others tools like IDE or continuous integration servers ●  No change in current POM format Licensed under a Creative Commons license

Apache Maven COMMUNITY Licensed under a Creative Commons license

Users Mailing List ●  users@maven.apache.org -  Traffic statistics cover a total of 1697 days. -  Current subscribers: 1861 -  Current digest subscribers: 47 -  Total posts (1697 days): 80633 ●  Blue : -  Mean posts per day: 47.52 -  Number of subscribers ●  http://pulse.apache.org/ ●  Red : -  Number of messages per day Licensed under a Creative Commons license

Apache Maven Web Site Licensed under a Creative Commons license

Dowloads ●  Per month downloads ●  http://people.apache.org/~vgritsenko/stats/projects/ maven.html Licensed under a Creative Commons license

The team ●  60 committers, ●  More than 30 active in 2009, ●  Several organizations like Sonatype, deliver resources and professional support, ●  A community less isolated : more interactions with Eclipse, Jetty, Licensed under a Creative Commons license

Commit Statistics Licensed under a Creative Commons license

Apache Maven CONCLUSION Licensed under a Creative Commons license

Conclusion ●  Today, Maven is widely adopted in corporate environments, ●  It provides many services, ●  It has an important and really active community of users and developers ●  Many resources to learn to use it and a professional support are available ●  A product probably far from being perfect but on rails for the future. Maven 3.0 is a new start. ●  Many things to do -  We need you ! Licensed under a Creative Commons license

Apache Maven QUESTIONS ? Licensed under a Creative Commons license

Licence et copyrights ●  Photos and logos belong to their respective authors/owners ●  Content under Creative Commons 3.0 -  Attribution — You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). -  Noncommercial — You may not use this work for commercial purposes. -  Share Alike — If you alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license to this one. ●  http://creativecommons.org/licenses/by-nc-sa/3.0/us/ Licensed under a Creative Commons license

Apache Maven TO GO FURTHER … Licensed under a Creative Commons license

Apache Maven DOCUMENTATIONS Licensed under a Creative Commons license

Some links ●  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 Licensed under a Creative Commons license

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 Licensed under a Creative Commons license

Books ●  Sonatype / O’Reilly : -  The Definitive Guide -  http://www.sonatype.com/ books -  Free download -  Available in several languages Licensed under a Creative Commons license

Books ●  Exist Global -  Better builds with Maven -  http://www.maestrodev.com/ better-build-maven -  Free download Licensed under a Creative Commons license

Apache Maven SUPPORT Licensed under a Creative Commons license

Support ●  Mailing lists -  http://maven.apache.org/mail-lists.html ●  IRC -  irc.codehaus.org - #maven ●  Forums -  http://www.developpez.net/ forum maven -  In French ●  Dedicated support -  Sonatype and many others companies Licensed under a Creative Commons license

http://www.techgig.com	30
http://blog.aheritier.net	24
http://www.slideshare.net	5
http://aheritier.net	1

Lausanne Jug (08th April, 2010) - Maven

by Arnaud Héritier on Apr 12, 2010

Accessibility

Categories

Upload Details

Usage Rights

4 Embeds 60

Statistics

Lausanne Jug (08th April, 2010) - Maven Presentation Transcript