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o adding m1->m2 guide submitted by jay hartley git-svn-id: https://svn.apache.org/repos/asf/maven/components/trunk@328226 13f79535-47bb-0310-9956-ffa450edef68
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Jason van Zyl
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@ -85,7 +85,9 @@ foo-1.0.jar (or whatever artifact is referred to in the pom.xml)
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* a url where the project can be found.</li>
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* if you are one of its developers, a url where your name or email can be found inside the project site.</li>
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* if you are one of its developers, a url where your name or email can be found inside the project site.
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[]
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This will speed up the uploading process.
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@ -1,25 +1,175 @@
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------
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-----
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Guide to Moving From Maven 1.x to Maven 2.x
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------
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Jason van Zyl
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------
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---
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Jay H. Hartley
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-----
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12 October 2005
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------
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-----
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~~ merge in the m1 FAQ
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~~ repoclean
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Guide to Moving from Maven 1.x to Maven 2.x
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** Projects using multiproject or project properties
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This document is intended to be continously updated from the mail list archives.
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For an only slightly out-of-date reference with concrete examples,
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check out Vincent Massol's
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{{{http://blogs.codehaus.org/people/vmassol/archives/001170_javazone_2005.html}JavaZone2005 presentation}}.
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Maven 1.x POMs that use multiproject and/or project.properties must be deployed by version 1.5 or later of the
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Artifact plugin for repoclean to successfully convert them. This ensures that any parent POMs and/or POM
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properties are fully resolved by Maven before deploying the POM.
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* Parallel Builds
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* planned tools
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It is possible to establish parallel Maven builds, one using the old M1 settings,
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and a second using M2. The Maven 2 configuration file names and uses have been modified,
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so the two builds should not conflict.
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A Maven 1.x build is configured with the following files:
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* [project.xml] Project Object Model (POM) definition
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* [maven.xml] Custom build scripts
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* [project.properties] general build settings
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* [build.properties] local build settings
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No there isn't something yet but it's planned. I have presented some slides at javaZone 2005 about "From m1 to m2".
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Maybe that could help you in the meantime:
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A Maven 2 build is configured with a different file set:
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* [pom.xml] POM definition
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* [settings.xml] local configuration
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* Migrating the POM
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http://blogs.codehaus.org/people/vmassol/archives/001170_javazone_2005.html
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The Project Object Model (POM) has moved from the project.xml file to pom.xml.
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The XML schema has also changed, from {{{http://maven.apache.org/maven-v3_0_0.xsd}Version 3}} to
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{{{http://maven.apache.org/maven-v4_0_0.xsd}Version 4}}.
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~~ doco coming from jay hartley
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The new POM is nominally a superset of the old, so the first step in creating a
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pom.xml is to copy over project.xml. Then start tweaking.
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There are several new elements that can be added to a POM, but all are optional so
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should not cause a problem with an initial build.
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project.xml:
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+----+
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<project>
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<pomVersion>3</pomVersion>
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<id>util</id>
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<name>Generic utility code</name>
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<groupId>project</groupId>
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<currentVersion>1.1</currentVersion>
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<package>org.apache.project.util</package>
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<dependencies>
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...
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</dependencies>
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<build>
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...
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</build>
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...
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</project>
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+----+
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pom.xml:
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+----+
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<project>
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<modelVersion>4.0.0</modelVersion>
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<artifactId>util</artifactId>
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<name>Generic Utility Code</name>
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<groupId>org.apache.project.util</groupId>
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<version>1.1</version>
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<packaging>jar</packaging>
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<dependencies>
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...
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</dependencies>
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<build>
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...
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</build>
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...
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</project>
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+----+
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For more details, check out the
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{{{http://maven.apache.org/maven2/guides/introduction/introduction-to-the-pom.html}POM Guide}}.
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* build.properties and project.properties
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These files have been replaced with
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{{{http://maven.apache.org/maven2/maven-settings/settings.html}settings.xml}}.
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Like with the POM, you can establish a parallel build environment, so the m1 build
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never breaks while the m2 build is being debugged.
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Additional local build customization options can also be created using
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{{{http://maven.apache.org/maven2/guides/introduction/introduction-to-profiles.html}profiles}}.
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* What to do with maven.xml?
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See {{http://maven.apache.org/maven2/maven1.html#m1-maven-xml}} for an explanation of
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why maven.xml was discarded, and
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{{http://maven.apache.org/maven2/guides/introduction/introduction-to-plugins.html}} for
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a guide to writing your own plug-ins.
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* Directory Structure
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The POM allows customization of the directory structure in both Maven 1 and Maven 2
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using the <<<\<build\>>>> tag. For simplicity, it would be ideal to move source to the
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{{{http://maven.apache.org/maven2/guides/introduction/introduction-to-the-standard-directory-layout.html}Maven 2 default structure}},
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but it is not required. You can begin by customizing the
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directories in Maven 2, then when satisfied that both build paths are working, move
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to the Maven 2 structure and customize the settings in Maven 1.
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* Migrating Plug-ins
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The main conceptual change in plugins and their use has to do with the concept of
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a build cycle in Maven 2. Instead of using <<<preGoal>>> and <<<postGoal>>> tags
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in <<<maven.xml>>> to tie plugin goals into the build process, the goals of a
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plugin are associated with the pre-defined stages of the build cycle. See the
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{{{http://maven.apache.org/maven2/guides/introduction/introduction-to-the-lifecycle.html}Introduction to the Build Lifecycle}}
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for more on how plugins relate.
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** Re-use Ant Tasks
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See the {{{http://maven.apache.org/maven2/general.html#using-ant-tasks}Ant Script FAQ}}.
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** Replace scripts with Mojos
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The new plugin architecture does not specify a specific language implementation, so
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Jelly scripts and other such artifacts should be re-usable with wrappers. It is recommended
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that you look into moving to
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{{{http://maven.apache.org/maven2/guides/plugin/guide-java-plugin-development.html}Mojos}}.
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** Utilize built-in Maven 2 capabilities
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*** Resource filtering to inject POM variables into application
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You can turn on {{{http://maven.apache.org/maven2/guides/getting-started/index.html#How do I filter resource files?}resource filtering}}
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in your POM. Tokens of the form <<<$\{pom.variable\}>>> in resource files will be replaced with the corresponding POM property.
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+----+
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<project>
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...
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<build>
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<resources>
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<resource>
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<directory>src/main/resources</directory>
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<filtering>true</filtering>
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</resource>
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</resources>
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</build>
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</project>
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+----+
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*** Multiproject Builds
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The old reactor+multiproject plugin combination was established more as an afterthought
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of the core development. In Maven 2, multiproject support is included in the core, so
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any scripts required in the past to work around problems with the multiproject plugin
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should be unnecessary.
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* Migrating repositories
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Every four hours the Maven 1.x repository is converted over to a Maven 2.x repository and we plan to release
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a plug-in based on our conversion tool but currently
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