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Apache Maven - eXo TN presentation

An overview of Apache Maven for eXo Platform Tunisia Teams

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Everything about …
APACHE MAVEN
Arnaud Héritier
                  •    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



                          2
Apache Maven
OVERVIEW
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.
•    Apache Maven is standards/conventions
     driven
     » How many of you are doing JEE and related
       developments ?
                             4
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 released in October 2010
     » 3.0.4 – January 2012
                              5
Choose your way of thinking


Conventions approach       Scripting approach




                       6

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Apache Maven - eXo TN presentation

  • 2. Arnaud Héritier •  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 2
  • 4. 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. •  Apache Maven is standards/conventions driven » How many of you are doing JEE and related developments ? 4
  • 5. 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 released in October 2010 » 3.0.4 – January 2012 5
  • 6. Choose your way of thinking Conventions approach Scripting approach 6
  • 7. 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 a well tested set of public API L 7
  • 8. With scripts oriented builds You can have But often you have (if you have good skills) (moreover after years …) 8
  • 9. With Maven We dream to deliver But yesterday we too often had (Maven 3.x) (Maven 2.x) 9
  • 11. Your menu •  Concepts •  Apache Maven 3.x •  Good and bad practices •  Usecases 11
  • 13. 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, …) •  … 13
  • 14. POM •  An XML file (pom.xml) <?xml version="1.0" encoding="UTF-8"?>! <project>! <modelVersion>4.0.0</modelVersion>! <groupId>net.aheritier.samples</groupId>! •  Describing <artifactId>simple-webapp</artifactId>! <version>1.1-SNAPSHOT</version>! » Project identification <packaging>war</packaging>! <name>Simple webapp</name>! » Project version <inceptionYear>2007</inceptionYear>! <dependencies>! » Project description <dependency>! <groupId>org.springframework</groupId>! » Build settings <artifactId>spring-struts</artifactId>! <version>2.0.2</version>! </dependency>! » Dependencies ...! </dependencies>! » … </project>! 14
  • 15. Reactor •  Split your project in sub-modules <project>! •  Maven computes the ...! build order from <modules>! <module>moduleA</module> ! dependencies <module>moduleB</module> ! between sub- <module>moduleC</module> ! modules. <module>moduleD</module> ! <module>moduleE</module> ! •  Modules have to be <module>moduleF</module> ! defined in the POM </modules>! » No auto-discovery for ...! performance reasons </project>! 15
  • 16. 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>! 16
  • 17. 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 17
  • 18. 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 18
  • 19. 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 19
  • 20. Dependencies Without Maven With Maven 20
  • 21. 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 21
  • 22. 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 22
  • 23. 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! 23
  • 24. 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 24
  • 25. Versions 25
  • 26. 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 L •  The release plugin will enforce it J 26
  • 27. 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. 27
  • 28. Versions •  Use the versions plugin to update all versions of your project and its modules mvn versions:set –DnewVersion=A.B.C-SNAPSHOT! 28
  • 29. 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! 29
  • 30. Profiles ●  activeByDefault = If no other profile is activated ●  Activation through Maven settings <settings>! ...! <activeProfiles>! <activeProfile>profile-1</activeProfile>! </activeProfiles>! ...! </settings>! 30
  • 31. 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>! 31
  • 32. Profiles •  OS / Java settings <profiles>! <profile>! <activation>! <profiles>! <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>! 32
  • 33. Profiles •  Activation on present or missing files <profiles>! <profile>! <activation>! <file>! <missing>${project.build.directory}/generated-sources/ axistools/wsdl2java/</missing>! </file>! </activation>! ...! </profile>! </profiles>! 33
  • 34. Build Lifecycle And Plugins •  Plugin based architecture for a great extensibility •  Standardized lifecycle to build all types of archetypes 34
  • 35. 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 35
  • 36. Build Lifecycle And Plugins •  Many plugins » Packaging » Reporting » IDE integration » Miscellaneous tools integration •  Many locations » maven.apache.org » mojo.codehaus.org » code.google.com » … Take care while selecting them !!! 36
  • 38. Apache Maven 3.x BACKWARD COMPATIBILITY 38
  • 39. Backward compatibility - Criticisms •  Migration from Maven 1 to Maven 2 was impossible. Everything had to be re-done. •  Updates between 2.x versions and also between 2.0.x weren’t often without side effects. 39
  • 40. Backward compatibility •  Near to 700 integration tests •  Tested for several months on a large set of OSS projects •  7 alphas + 3 betas versions •  A bug fix release every 6 weeks •  It’s a revolution under the hood but an evolution for end users 40
  • 41. Maven 3.0.x ITs 674 41
  • 43. Performances - Criticisms •  Maven is slow •  It spends its time to download the world •  Whereas everybody has multicore CPUs, it doesn’t allow to process modules builds in parallel 43
  • 44. Performances •  A set of benchmark tools was developed to measure Maven 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 44
  • 45. 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 45
  • 46. Performances – mvnsh •  Performances optimizations » Intelligent cache system (artifacts resolution, project descriptors …) » No need to restart a JVM for each build •  Cross platform « unix like » shell » Alias, environment settings … » Color highlighting 46
  • 47. Performances – mvnsh •  All in one » Includes Maven 3.x » Allows to have color highlighting with “standard” Maven 3.x •  Developed and freely distributed by Sonatype 47
  • 50. Extensibility - Criticisms •  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 50
  • 51. Extensibility •  New APIs to improve abstraction of underneath implementation » Aether : to manage artifacts and repositories •  Plugin classloader partitioning •  Embeddable •  IOC replaced by Guice » For now (3.0) a wrapper is hiding the change » You don’t yet use Guice directly (from plugins for example) 51
  • 53. Robustness - Criticisms •  Builds aren’t predictable •  Errors are difficult to diagnose 53
  • 54. 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 54
  • 55. Robustness – Artifacts management •  Parent POMs prefer to resolve from repositories » Version less parent will be available in a future maven 3.x release by using the relativePath element •  Profiles usage consolidation » No more profiles.xml (incompatible with future polyglot feature) 55
  • 56. Robustness – Artifacts management •  No more support for legacy repository layout for Maven 1.0 •  SNAPSHOTs are always deployed with timestamps 56
  • 57. Robustness – Plugins management •  Plugin 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 57
  • 58. Robustness – Site plugin •  Site plugin is now completely extracted from Maven core » It has its own lifecycle » reporting section in POM becomes useless (moved in plugin configuration) 58
  • 60. Criticisms •  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 60
  • 61. POM •  No change in POM syntax for Maven 3.0 •  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 maven versions •  Mixins to allow to import POM fragments 61
  • 62. POM - Polyglot •  Developed and freely distributed by Sonatype •  Extended version of Maven 3.0 using its new embedding and extensibility capabilities •  Allow translation (read/write) from/to various syntaxes » Yaml » Scala » Groovy •  Allow macros and freeform scripting 62
  • 63. Apache Maven GOOD & BAD PRACTICES
  • 65. 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 •  … 65
  • 67. 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 ? 67
  • 68. 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 … 68
  • 69. 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 … 69
  • 70. Apache Maven POM GOOD & BAD PRACTICES 70
  • 71. 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 71
  • 72. 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. 72
  • 73. 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. 73
  • 75. 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 75
  • 76. 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) 76
  • 78. Apache Maven SECURE YOUR CREDENTIALS 78
  • 79. Secure your credentials l  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>! 79
  • 80. 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>! 80
  • 81. Apache Maven BUILD A PART OF YOUR PROJECT 81
  • 82. 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 82
  • 83. Using Reactor Options - -  arnaud@mbp-arnaud:~$ mvn install
 install [INFO] ------------------------------------------------
 ------------------------------------------------ [INFO] Reactor Summary: Summary:
 [INFO]
 [INFO] [INFO] Project ....................... SUCCESS [2.132s]
 [2.132s] [INFO] ModuleA ....................... SUCCESS [5.574s]
 [5.574s] [INFO] ModuleB ....................... SUCCESS [0.455s]
 [0.455s] [INFO] ModuleC ....................... SUCCESS [0.396s]
 [0.396s] [INFO] ModuleD ....................... SUCCESS [0.462s]
 [0.462s] [INFO] ModuleE ....................... SUCCESS [0.723s]
 [0.723s] [INFO] ModuleF ....................... SUCCESS [0.404s]! [0.404s] l l  Builds everything from A to F 83
  • 84. Using Reactor Options - -  arnaud@mbp-arnaud:~$ mvn install –pl moduleE,moduleB
 moduleE,moduleB -------------------------------------------
 [INFO] ------------------------------------------- Summary:
 [INFO] Reactor Summary: [INFO]
 [INFO] [2.774s]
 [INFO] ModuleB .................. SUCCESS [2.774s] [1.008s]
 [INFO] ModuleE .................. SUCCESS [1.008s] ! l l  Builds only modules B and E l l  Following dependencies order l l  -pl --project-list: Build the specified reactor projects instead of all projects 84
  • 85. Using Reactor Options - -  arnaud@mbp-arnaud:~$ mvn install –pl moduleD -am
 ------------------------------------------
 [INFO] ------------------------------------------ Summary:
 [INFO] Reactor Summary: [INFO]
 [INFO] [4.075s]
 [INFO] ModuleA ................. SUCCESS [4.075s] [0.468s]
 [INFO] ModuleB ................. SUCCESS [0.468s] [0.354s]
 [INFO] ModuleC ................. SUCCESS [0.354s] [0.384s]
 [INFO] ModuleD ................. SUCCESS [0.384s] ! l l  Builds module D (-pl) and all modules it uses as dependencies l l  -am --also-make: If a project list is specified, also make projects that the list depends on l l  Usecase : Build all modules required for a war, ear, … 85
  • 86. Using Reactor Options - -  arnaud@mbp-arnaud:~$ mvn install –pl moduleD -amd
 ------------------------------------------
 [INFO] ------------------------------------------ Summary:
 [INFO] Reactor Summary: [INFO]
 [INFO] [4.881s]
 [INFO] ModuleD ................. SUCCESS [4.881s] [0.478s]
 [INFO] ModuleE ................. SUCCESS [0.478s] [0.427s]
 [INFO] ModuleF ................. SUCCESS [0.427s] ! l l  Builds module D (-pl) and all modules which depend on it l l  -amd --also-make-dependents: If a project list is specified, also make projects that depend on projects on the list l l  Usecase : Check that a change in a module didn’t break others which are using it 86
  • 87. Using Reactor Options - -  arnaud@mbp-arnaud:~$ mvn install –rf moduleD
 ------------------------------------------
 [INFO] ------------------------------------------ Summary:
 [INFO] Reactor Summary: [INFO]
 [INFO] [9.707s]
 [INFO] ModuleD ................. SUCCESS [9.707s] [0.625s]
 [INFO] ModuleE ................. SUCCESS [0.625s] [INFO] ModuleF ................. SUCCESS [0.679s] [2.467s]
 [INFO] Project ................. SUCCESS [2.467s] ! l l  Restarts all the build from module D (-rf) l l  -rf,--resume-from <arg> : Resume reactor from specified project l l  Usecase : The build failed a 1st time in module D, you fixed it, and restart the build were it was to end it. 87
  • 89. Release of a webapp in 2002 •  Limited usage of eclipse » No WTP (Only some features in WSAD), » No ability to produce WARs 89
  • 90. 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 90
  • 91. Release of a webapp in 2002 •  One problem : The are •  How long did it take ? always problems » When everything is » Error in config files ok : 15 minutes »  Missing dependencies » When there’s a »  Missing file problem : ½ day or »  Last minute fix which created a more bug »  And many other possibilies .. 91
  • 92. 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. 92
  • 94. Configuration and Prerequisites •  Project version (must be a SNAPSHOT version) •  Dependencies and plugins versions mustn’t be SNAPSHOTs 94
  • 95. 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 95
  • 96. 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>! 96
  • 97. 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 </repository>! user’s maven settings . . .! (~/.m2/settings.xml) </distributionManagement>! . . . ! <properties>! <acme.releases.repo.url>http://repo.acme.com/acme-releases</acme.releases.repo.url>! . . .! </properties>! </project>! Often useful to have a property to test the release process on a fake repository, to validate a repo manager ... 97
  • 98. 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> <password>{ABCDEFGHIJKLMNOPQRSTUVWYZ}</password>! distributionManagement </server>! ...! entry of the project to </servers>! release ...! </settings>! 98
  • 99. 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 </property>! </activation>! used in profiles you want to <build>! activate in the release <plugins>! process ...! </plugins>! </build>! Configuration to generate </profile>! sources and javadoc jars with basic setting 99
  • 100. 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 </configuration>! profile </plugin>! Use our customized </plugins>! </pluginManagement>! profile </build>! ...! <profiles>! <profile>! <id>myreleaseprofile</id>! <build>! ...! Our customized profile </build>! </profile>! Customize the behavior </profiles>! ...! of the build for a release </project>! Take care to test is before the release !! 100
  • 101. Apache Maven SETUP A GLOBAL MIRROR 101
  • 102. 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 102
  • 103. How should we setup a global mirror ? <setting>
 <mirrors>
 <mirror>
 <id>global-mirror</id>
 <mirrorOf>external:*</mirrorOf>
 <url>http://repo.acme.com/public</url>
 <url>http://repo.acme.com/public</url> Send all requests to this url </mirror>
 </mirrors>
 <profiles>
 <profile>
 <id>mirror</id>
 <repositories>
 <repository>
 <id>central</id>
 <url>http://central</url>
 <releases><enabled>true</enabled></releases>
 <releases><enabled>true</enabled></releases> Use « central » id to <snapshots><enabled>true</enabled></snapshots>
 <snapshots><enabled>true</enabled></snapshots> override default maven </repository>
 configuration </repositories>
 <pluginRepositories>
 Enable snapshots <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 103
  • 104. Apache Maven TO GO FURTHER …
  • 106. 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) 106
  • 107. 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 107
  • 112. Netbeans 112
  • 114. Users Mailing List •  users@maven.apache.or •  Blue : g » Number of subscribers » Traffic statistics cover a total of 2025 days. •  Red : » Current subscribers: 1936 » Number of messages » Current digest per day subscribers: 48 » Total posts (2025 days): 89687 » Mean posts per day: 44.29 •  http://pulse.apache.org/ 114
  • 115. Apache Maven Web Site 115
  • 117. 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, 117
  • 118. Commit Statistics •  In light blue the number of active commiters 118
  • 120. 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 120
  • 121. 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 121
  • 122. Books •  Sonatype / O’Reilly : » The Definitive Guide » http:// www.sonatype.com/ books » Free download » Available in several languages 122
  • 123. Books •  Apache Maven 2 Effective Implementation » Brett Porter, Maria Odea Ching » https:// www.packtpub.com/ apache-maven-2- effective- implementation/book 123
  • 124. Books •  Exist Global » Better builds with Maven » http:// www.maestrodev.com /better-build-maven » Free download 124
  • 126. 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 126
  • 128. 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 128
  • 129. Licence et copyrights •  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/ 129