1. MAVEN
INTELLIGENT PROJECTS
Mert ÇALI!KAN

2. About Me
• Mert ÇALIŞKAN
• Software Plumber :)
SCJP certified bla bla..
• Open Source Software advocate.
Involved in numerous OSS projects like
PrimeFaces, mesir ...
• Apache Software Foundation member
OpenLogic Expert Community member
http://www.jroller.com/mert
http://www.twitter.com/mertcaliskan
Java Developer Conference 2010

3. About You
+
Gradle
Java Developer Conference 2010

4. Agenda
• Maven is ? • IDE Support
• Core Concepts • How to increase
- The POM your MOJOtivity ?
- Build Life Cycle
- Dependency Mechanism
- Repositories
- Plugins
• Archetypes
Java Developer Conference 2010

5. MAVEN ?
Java Developer Conference 2010

6. Maven is...
• A project management framework from ASF
• Uniform build system
• Making the build as easy as possible
• Comprehensive model for software projects
• Versions:
1.x
2.x ( 2.0.x, 2.2.x(jdk1.5) )
3.x
2.x projects & plugins are still supported
completely rewritten - new artifact resolution system / dependency resolving
algorithm. Better IDE support
Java Developer Conference 2010

7. Highlights
• Convention over Configuration
• Common Interfaces
The time of build engineers is over
Stop building the build and focus on development !
• Dependency Management
Public repositories
• Plugin Architecture
• Documentation
Generate documentation, reports ...
Java Developer Conference 2010

8. THE POM
Java Developer Conference 2010

9. The POM
• It is what makes your project a maven project
• An XML file
• Not just for building the project
project’s relationship, list of team members, license, SCM and etc.
• Not only for Java projects
build FLEX code with appropriate plugins
build Microsoft binaries from C# code
Java Developer Conference 2010

10. The POM
http://tinyurl.com/maven-xsddoc
Java Developer Conference 2010

11. The POM
<project ...>
<parent />
<groupId /> <artifactId /> <version />
<packaging />
<developers /> <contributors />
<scm>... </scm>
<build>
<plugins>....</plugins>
</build>
<dependencies>....</dependencies>
<repositories>....</repositories>
<pluginRepositories>... </pluginRepositories>
<profiles>...</profiles>
<reporting>... </reporting>
</project>
Java Developer Conference 2010

12. Simplest POM
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>org.egjug.jdc2010</groupId>
<artifactId>my-app</artifactId>
<version>1.0.0</version>
</project>
}
compile code
run tests
$ mvn install package as jar
deploy to local repo
Java Developer Conference 2010

13. How is that possible with 6 lines of XML?
Where do I define the source folders, test
folders and all other stuff ?
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14. Super POM
• Same analogy with java.lang.Object
• ${M2_HOME}/lib/ maven-2.2.1-uber.jar!
/org/apache/maven/project/pom-4.0.0.xml
• Standard directory layout
• Locks versions of common plugins >= 2.0.9
• Repo def. for http://repo1.maven.org/maven2
• To see the merged POM:
$!mvn help:effective-pom
Java Developer Conference 2010

15. BUILD
LIFE CYCLE
Java Developer Conference 2010

16. Build Life Cycle
• Process for building and distributing an artifact is clearly
defined
• 3 built-in Life Cycles
default: handle project deployment
clean: clean project files generated by a build
site: generate project’s site doc.
• Life Cycle consists of phases in specific order
• Zero or more goals attached to each phase
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17. validate
default
compile
test
package
integration-test
verify
install
deploy
Java Developer Conference 2010

18. default
validate
mvn <phase>
mvn <phase:goal>
compile
mvn <phase> <phase:goal>
mvn <phase:goal> <phase:goal>
test
package
$ mvn integration-test
integration-test validate
verify compile
install test
deploy package
integration-test
Java Developer Conference 2010

19. DEPENDENCY
MECHANISM
Java Developer Conference 2010

20. Dependency Mechanism
• Gimme the Coordinates ! (GAV factor)
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.8.1</version>
<scope>compile</scope>
</dependency>
• Transitive Dependencies
You can exclude what you don’t want
or omit them all with <optional>false</optional>
Java Developer Conference 2010

21. $ mvn dependency:tree
[INFO] net:eniyiyemek:war:1.0-SNAPSHOT
[INFO] +- org.jboss.seam:jboss-seam:jar:2.2.0.GA:compile
[INFO] | +- xstream:xstream:jar:1.1.3:compile
[INFO] | +- xpp3:xpp3_min:jar:1.1.3.4.O:compile
[INFO] | - org.jboss.el:jboss-el:jar:1.0_02.CR4:compile
[INFO] +- org.jboss.seam:jboss-seam-ui:jar:2.2.0.GA:compile
[INFO] | +- org.jboss.seam:jboss-seam:ejb:2.2.0.GA:compile
[INFO] | +- org.jboss.seam:jboss-seam-jul:jar:2.2.0.GA:compile
[INFO] | - commons-beanutils:commons-beanutils:jar:1.7.0:compile
[INFO] +- org.jboss.seam:jboss-seam-mail:jar:2.2.0.GA:compile
[INFO] +- javax.mail:mail:jar:1.4.1:compile
[INFO] | - javax.activation:activation:jar:1.1:compile
[INFO] +- quartz:quartz:jar:1.6.0:compile
[INFO] +- commons-logging:commons-logging:jar:1.1.1:compile
[INFO] +- javax.faces:jsf-api:jar:1.2_13:compile
[INFO] +- javax.faces:jsf-impl:jar:1.2_13:compile
[INFO] +- com.sun.facelets:jsf-facelets:jar:1.1.14:compile
[INFO] +- jstl:jstl:jar:1.2:compile
[INFO] +- org.primefaces:primefaces-stable:jar:1.0.0:compile
[INFO] +- javax.transaction:jta:jar:1.1:compile
[INFO] +- org.hibernate:hibernate-core:jar:3.5.0-Beta-2:compile
[INFO] | +- antlr:antlr:jar:2.7.6:compile
[INFO] | +- dom4j:dom4j:jar:1.6.1:compile
[INFO] | - org.slf4j:slf4j-api:jar:1.5.8:compile
[INFO] +- org.hibernate:hibernate-annotations:jar:3.5.0-Beta-2:compile
[INFO] | +- org.hibernate:hibernate-commons-annotations:jar:3.2.0.Beta1:compile
[INFO] | +- org.hibernate.java-persistence:jpa-api:jar:2.0-cr-1:compile
[INFO] | - hsqldb:hsqldb:jar:1.8.0.2:compile
[INFO] +- org.hibernate:hibernate-entitymanager:jar:3.5.0-Beta-2:compile
[INFO] | - cglib:cglib:jar:2.2:compile
[INFO] | - asm:asm:jar:3.1:compile
[INFO] +- org.hibernate:hibernate-validator-legacy:jar:4.0.2.GA:compile
Java Developer Conference 2010

22. $ mvn dependency:analyze
Unused declared deps:
[WARNING] Unused declared dependencies found:
[WARNING] org.egjug.jdc2010:projectB:jar:1.0:compile
[WARNING] org.egjug.jdc2010:projectC:jar:1.0:compile
Used undeclared deps:
[WARNING] Used undeclared dependencies found:
[WARNING] opensymphony:xwork:jar:2.0.0:compile
Java Developer Conference 2010

23. Scopes for Dependencies
compile
provided
runtime
test
system
import
CTR
Classpaths
Compile Test Runtime
Java Developer Conference 2010

24. CTR compile default scope, compile scoped dependencies will be in classpath
similar to the compile, artifact should be provided by
CT provided JDK / container @ runtime
TR runtime not needed for compilation but needed @ runtime
T test only needed for test compilation & execution
same as provided, but artifact should be provided
CT system explicitly with <systemPath />
with maven 2.0.9...dependency to be replaced with
--- import the dependencies in that POM's
<dependencyManagement> section.
Java Developer Conference 2010

25. Versioning and Ranges
<major>.<minor>.<incremental> - <qualifier>
1.2.3 / 1.2.3-alpha-01
Be careful with string comparison, ordering at the qualifiers...
1.2.3-alpha-2 > 1.2.3-alpha-10
(, ) - Exclusive
[, ] - Inclusive <version>[3.8,4.0)</version>
Java Developer Conference 2010

26. SNAPSHOT qualifier
• Active development version
• Resolve from remote Repo:
myjar-1.0.0-SNAPSHOT.jar
applies pattern date . time - build#
resolves to myjar-1.0.0-20100219.141012-1.jar
Install to local Repo:
1.0.0-SNAPSHOT will be 1.0.0-SNAPSHOT
Java Developer Conference 2010

27. How Maven
Resolve
Versions?
Java Developer Conference 2010

28. Compile
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging commons-logging commons-logging
commons-logging
B : B : 2.0 commons-logging commons-logging
1.0.4 1.1.1 1.0.1
commons-logging
commons-logging
1.1.1
Java Developer Conference 2010
Dependency Graph

29. A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
Which B will Maven choose?
commons-logging commons-logging commons-logging
commons-logging
B : B : 2.0 commons-logging commons-logging
1.0.4 1.1.1 1.0.1
commons-logging
commons-logging
1.1.1
B : 2.0 ?
Highest One?
Java Developer Conference 2010

30. Closest One
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging commons-logging commons-logging
commons-logging
B : B : 2.0 commons-logging commons-logging
1.0.4 1.1.1 1.0.1
commons-logging
commons-logging
1.1.1
Java Developer Conference 2010

31. Which commons-logging?
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
?
commons-logging
commons-logging
1.0.4
B : B : 2.0 commons-logging
commons-logging
1.1.1 ?
commons-logging
commons-logging
1.0.1 ?
?
commons-logging
commons-logging
1.1.1
Java Developer Conference 2010

32. The sequential first at the same distance
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging commons-logging commons-logging
commons-logging
B : B : 2.0 commons-logging commons-logging
1.0.4 1.1.1 1.0.1
commons-logging
commons-logging
1.1.1
Java Developer Conference 2010

33. A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging
commons-logging
1.0.4
Dependency Graph
Java Developer Conference 2010

34. IS PROJECT A GONNA WORK ?
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging
commons-logging
1.0.4
Dependency Graph
Java Developer Conference 2010

35. A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging
commons-logging
1.0.4
Dependency Graph
Java Developer Conference 2010

36. USE <dependencyManagement />
A : A : 1.0
D : D : 1.0 C : C : 1.0 B : B : 1.0
commons-logging commons-logging commons-logging
commons-logging
B : B : 2.0 commons-logging commons-logging
1.0.4 1.1.1 1.0.1
commons-logging
commons-logging
1.1.1
Java Developer Conference 2010
Dependency Graph

37. Managing Dependencies
Managing Projects
Inheritance
Aggregation
POM Bundles
Java Developer Conference 2010

38. Inheritance
<project>
<modelVersion>4.0.0</modelVersion>
parentapp
<parent>
<groupId>org.egjug.jdc2010</groupId>
<artifactId>parentapp</artifactId>
<<extends>>
<version>1.0.0</version>
</parent>
sampleapp <groupId>org.egjug.jdc2010</groupId>
<artifactId>sampleapp</artifactId>
<version>1.0.0</version>
</project>
Java Developer Conference 2010

39. Inheritance <dependencyManagement />
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>org.egjug.jdc2010</groupId>
<artifactId>parentapp</artifactId>
<packaging>pom</packaging>
parentapp <version>1.0</version>
<dependencyManagement>
<<extends>> <dependencies>
" <dependency>
" <groupId>commongs-logging</groupId>
sampleapp " <artifactId>commongs-logging</artifactId>
" <version>1.1.1</version>
</dependency>
</dependencies>
</dependencyManagement>
</project>
Java Developer Conference 2010

40. Inheritance <dependencyManagement />
<project>
<modelVersion>4.0.0</modelVersion>
" <parent>
" " <groupId>org.egjug.jdc2010</groupId>
parentapp " " <artifactId>parentapp</artifactId>
" " <version>1.0</version>
" </parent>
<<extends>> <artifactId>sampleapp</artifactId>
<dependencies>
" <dependency>
sampleapp
" <groupId>commongs-logging</groupId>
! <artifactId>commongs-logging</artifactId>
</dependency>
will get version 1.1.1...
</dependencies>
</project>
Java Developer Conference 2010

41. Aggregation
<<depends>> <<depends>>
ProjectA ProjectB ProjectC
root $!cd ProjectC
}
projectC $ mvn compile
projectC $ cd ..
root $!cd ProjectB
projectB $ mvn compile 8 lines !!!
projectB $ cd ..
root $!cd ProjectA
projectA $ mvn compile
Java Developer Conference 2010

42. Aggregation
modulesapp modulesapp:
<<module>>
<project>
<<module>>
<modelVersion>4.0.0</modelVersion>
<<module>> <groupId>org.egjug.jdc2010</groupId>
<artifactId>modulesapp</artifactId>
ProjectA ProjectB <packaging>pom</packaging>
<version>1.0</version>
<name>modulesapp</name>
ProjectC <modules>
<module>projectA</module>
<module>projectB</module>
<module>projectC</module>
root $!cd modulesapp </modules>
modulesapp $ mvn compile </project>
Java Developer Conference 2010

43. POM Bundles
<project>
<modelVersion>4.0.0</modelVersion>
<groupId>org.egjug.jdc2010</groupId>
<artifactId>commonspom</artifactId>
<packaging>pom</packaging>
<version>1.0</version>
<dependencies>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
<version>3.2.1</version>
</dependency>
<dependency>
<groupId>commons-digester</groupId>
<artifactId>commons-digester</artifactId>
<version>2.0</version>
</dependency>
.....
</dependencies>
</project>
Java Developer Conference 2010

44. POM Bundles
<dependency>
<groupId>org.egjug.jdc2010</groupId>
<artifactId>commonspom</artifactId>
<version>1.0</version>
<type>pom</type>
</dependency>
Java Developer Conference 2010

45. REPOSITORIES
Java Developer Conference 2010

46. M2_REPO/javax/activation/activation/1.1/activation-1.1.jar
M2_REPO/antlr/antlr/2.7.6/antlr-2.7.6.jar
M2_REPO/asm/asm/3.1/asm-3.1.jar
M2_REPO/cglib/cglib/2.2/cglib-2.2.jar
M2_REPO/commons-beanutils/commons-beanutils/1.7.0/commons-beanutils-1.7.0.jar
M2_REPO/commons-codec/commons-codec/1.3/commons-codec-1.3.jar
M2_REPO/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar
M2_REPO/commons-lang/commons-lang/2.4/commons-lang-2.4.jar
M2_REPO/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.jar
M2_REPO/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar
M2_REPO/javax/el/el-api/1.0/el-api-1.0.jar
M2_REPO/org/hibernate/hibernate-annotations/3.5.0-Beta-2/hibernate-annotations-3.5.0-Beta-2.jar
M2_REPO/org/hibernate/hibernate-commons-annotations/3.2.0.Beta1/hibernate-commons-annotations-3.2.0.Beta1.jar
M2_REPO/org/hibernate/hibernate-core/3.5.0-Beta-2/hibernate-core-3.5.0-Beta-2.jar
M2_REPO/org/hibernate/hibernate-entitymanager/3.5.0-Beta-2/hibernate-entitymanager-3.5.0-Beta-2.jar
M2_REPO/org/hibernate/hibernate-validator-legacy/4.0.2.GA/hibernate-validator-legacy-4.0.2.GA.jar
M2_REPO/hsqldb/hsqldb/1.8.0.2/hsqldb-1.8.0.2.jar
M2_REPO/javassist/javassist/3.10.0.GA/javassist-3.10.0.GA.jar
M2_REPO/org/jboss/el/jboss-el/1.0_02.CR4/jboss-el-1.0_02.CR4.jar
M2_REPO/org/jboss/seam/jboss-seam/2.2.0.GA/jboss-seam-2.2.0.GA.jar
M2_REPO/org/jboss/seam/jboss-seam-jul/2.2.0.GA/jboss-seam-jul-2.2.0.GA.jar
M2_REPO/org/jboss/seam/jboss-seam-mail/2.2.0.GA/jboss-seam-mail-2.2.0.GA.jar
Stack
M2_REPO/org/jboss/seam/jboss-seam-ui/2.2.0.GA/jboss-seam-ui-2.2.0.GA.jar
M2_REPO/org/hibernate/java-persistence/jpa-api/2.0-cr-1/jpa-api-2.0-cr-1.jar
M2_REPO/javax/faces/jsf-api/1.2_13/jsf-api-1.2_13.jar
M2_REPO/com/sun/facelets/jsf-facelets/1.1.14/jsf-facelets-1.1.14.jar
M2_REPO/javax/faces/jsf-impl/1.2_13/jsf-impl-1.2_13.jar
M2_REPO/jstl/jstl/1.2/jstl-1.2.jar
JSF
M2_REPO/javax/transaction/jta/1.1/jta-1.1.jar
M2_REPO/junit/junit/3.8.1/junit-3.8.1.jar
M2_REPO/javax/mail/mail/1.4.1/mail-1.4.1.jar
PrimeFaces
M2_REPO/postgresql/postgresql/8.4-701.jdbc3/postgresql-8.4-701.jdbc3.jar
M2_REPO/org/primefaces/primefaces-stable/1.0.0/primefaces-stable-1.0.0.jar
M2_REPO/quartz/quartz/1.6.0/quartz-1.6.0.jar
Seam
M2_REPO/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar
M2_REPO/org/slf4j/slf4j-api/1.5.8/slf4j-api-1.5.8.jar
M2_REPO/org/slf4j/slf4j-nop/1.5.6/slf4j-nop-1.5.6.jar
JPA
M2_REPO/org/testng/testng/5.9/testng-5.9.jar
M2_REPO/xpp3/xpp3_min/1.1.3.4.O/xpp3_min-1.1.3.4.O.jar
Java Developer Conference 2010
M2_REPO/xstream/xstream/1.1.3/xstream-1.1.3.jar
Hibernate

47. M2_REPO/javax/activation/activation/1.1/activation-1.1.jar
M2_REPO/antlr/antlr/2.7.6/antlr-2.7.6.jar
M2_REPO/asm/asm/3.1/asm-3.1.jar
M2_REPO/cglib/cglib/2.2/cglib-2.2.jar
M2_REPO/commons-beanutils/commons-beanutils/1.7.0/commons-beanutils-1.7.0.jar
M2_REPO/commons-codec/commons-codec/1.3/commons-codec-1.3.jar
M2_REPO/commons-collections/commons-collections/3.2.1/commons-collections-3.2.1.jar
M2_REPO/commons-lang/commons-lang/2.4/commons-lang-2.4.jar
M2_REPO/commons-logging/commons-logging/1.1.1/commons-logging-1.1.1.jar
M2_REPO/dom4j/dom4j/1.6.1/dom4j-1.6.1.jar
M2_REPO/javax/el/el-api/1.0/el-api-1.0.jar
M2_REPO/org/hibernate/hibernate-annotations/3.5.0-Beta-2/hibernate-annotations-3.5.0-Beta-2.jar
40
M2_REPO/org/hibernate/hibernate-commons-annotations/3.2.0.Beta1/hibernate-commons-annotations-3.2.0.Beta1.jar
M2_REPO/org/hibernate/hibernate-core/3.5.0-Beta-2/hibernate-core-3.5.0-Beta-2.jar
M2_REPO/org/hibernate/hibernate-entitymanager/3.5.0-Beta-2/hibernate-entitymanager-3.5.0-Beta-2.jar
M2_REPO/org/hibernate/hibernate-validator-legacy/4.0.2.GA/hibernate-validator-legacy-4.0.2.GA.jar
M2_REPO/hsqldb/hsqldb/1.8.0.2/hsqldb-1.8.0.2.jar
M2_REPO/javassist/javassist/3.10.0.GA/javassist-3.10.0.GA.jar
M2_REPO/org/jboss/el/jboss-el/1.0_02.CR4/jboss-el-1.0_02.CR4.jar
M2_REPO/org/jboss/seam/jboss-seam/2.2.0.GA/jboss-seam-2.2.0.GA.jar
M2_REPO/org/jboss/seam/jboss-seam-jul/2.2.0.GA/jboss-seam-jul-2.2.0.GA.jar
M2_REPO/org/jboss/seam/jboss-seam-mail/2.2.0.GA/jboss-seam-mail-2.2.0.GA.jar
M2_REPO/org/jboss/seam/jboss-seam-ui/2.2.0.GA/jboss-seam-ui-2.2.0.GA.jar
M2_REPO/org/hibernate/java-persistence/jpa-api/2.0-cr-1/jpa-api-2.0-cr-1.jar
M2_REPO/javax/faces/jsf-api/1.2_13/jsf-api-1.2_13.jar
M2_REPO/com/sun/facelets/jsf-facelets/1.1.14/jsf-facelets-1.1.14.jar
M2_REPO/javax/faces/jsf-impl/1.2_13/jsf-impl-1.2_13.jar
M2_REPO/jstl/jstl/1.2/jstl-1.2.jar
M2_REPO/javax/transaction/jta/1.1/jta-1.1.jar
M2_REPO/junit/junit/3.8.1/junit-3.8.1.jar
M2_REPO/javax/mail/mail/1.4.1/mail-1.4.1.jar
M2_REPO/postgresql/postgresql/8.4-701.jdbc3/postgresql-8.4-701.jdbc3.jar
M2_REPO/org/primefaces/primefaces-stable/1.0.0/primefaces-stable-1.0.0.jar
M2_REPO/quartz/quartz/1.6.0/quartz-1.6.0.jar
M2_REPO/javax/servlet/servlet-api/2.5/servlet-api-2.5.jar
M2_REPO/org/slf4j/slf4j-api/1.5.8/slf4j-api-1.5.8.jar
M2_REPO/org/slf4j/slf4j-nop/1.5.6/slf4j-nop-1.5.6.jar
M2_REPO/org/testng/testng/5.9/testng-5.9.jar
M2_REPO/xpp3/xpp3_min/1.1.3.4.O/xpp3_min-1.1.3.4.O.jar
Java Developer Conference 2010
M2_REPO/xstream/xstream/1.1.3/xstream-1.1.3.jar

48. Repositories
• Repositories are for managing build artifacts and
dependencies
• local or remote repositories
• Can store jar, war, ear, ejb, rar ....
• Maven looks to at least 2 repository if none
specified
- local one
- http://repo1.maven.org/maven2 /uber-pom/
• Release & Snapshot repositories
Java Developer Conference 2010

49. Repositories
<repository>
<id>jboss-repo</id>
<name>The Release JBoss maven repo</name>
<url>http://repository.jboss.org/maven2</url>
<releases>
<enabled>true</enabled>
</releases>
</repository>
<repository>
<id>jboss-snapshot-repo</id>
<name>The Snapshot JBoss maven repo</name>
<url>http://snapshots.jboss.org/maven2</url>
<snapshots>
<enabled>true</enabled>
</snapshots>
</repository>
Java Developer Conference 2010

50. Create Your own Repo
• Go Corporate !
• Deploy and share your projects artifacts
across your team
• Cache dependencies
Decrease the internet dependency
• Proxy Repo configurations
• OSS Alternatives:
Nexus
Archiva
Artifactory
Java Developer Conference 2010

51. Sonatype Nexus
Nexus Repository Manager
• Just a Web App, nice UI
• Upload artifacts via HTTP, RESTful
style
• Indexing and searching for repository
artifacts
• LDAP Integration with v1.5
Nexus Professional ($$$)
- Staging repository
- Eclipse plugin repository and more...
Java Developer Conference 2010

52. Searching for Artifacts
• http://repository.apache.org
• http://www.jarvana.com
• http://www.artifact-repository.org
• http://mvnrepository.com
• http://www.mvnbrowser.com
• http://mavensearch.net
Java Developer Conference 2010

53. PLUGINS
Java Developer Conference 2010

54. Plugins
• Plugin-oriented Architecture
plugin for even compiling the code..
• A maven artifact w/ descriptor (plugin.xml) and one
or more MOJOs
• Plexus as its IoC
Why not Spring?
• Where to look for plugins:
org.apache.maven.plugins
org.codehaus.mojo
Java Developer Conference 2010

55. Plugins available @ maven
Packaging Integration
jar war ear ejb
Core rar pom shade Eclipse
clean IDEA
compiler
deploy
failsafe
install Maven Tools Ant
resources Reporting
Repo Antlr
site Antrun
Changelog
surefire Archetype
Changes
verifier Assembly
Checkstyle
Clover Others Cargo Help
Javadocs jaxme Release
PMD jetty
Surefire-reports tomcat
Java Developer Conference 2010

56. ARCHETYPES
Java Developer Conference 2010

57. Archetypes
• Templates for maven projects
• Descriptor XML files + velocity templates
• To create a maven project:
mvn archetype:generate
-DgroupId=org.egjug.jdc2010
-DartifactId=archetype-quickstart
-Dversion=1.0-SNAPSHOT
-DarchetypeGroupId=org.apache.maven.archetypes
-DarchetypeArtifactId=maven-archetype-quickstart
-DarchetypeVersion=1.0
Java Developer Conference 2010

58. Archetype Catalogs
• Descriptor file to share Archetypes globally.
<?xml version="1.0" encoding="UTF-8"?>
<archetype-catalog>
<archetypes>
....
<archetype>
<groupId>org.jboss.weld.archetypes</groupId>
<artifactId>weld-jsf-servlet-minimal</artifactId>
<version>1.0.0-BETA1</version>
<description>....</description>
</archetype>"
.....
</archetypes>
</archetype-catalog>
• $!mvn archetype:generate -DarchetypeCatalog=http://
anonsvn.jboss.org/repos/weld/archetypes/tags/1.0.0-
BETA1
Java Developer Conference 2010

59. Archetypes from Existing Project
• Use an existing project as a seed for archetype
$ mvn archetype:create-from-project
• generated archetype under :
target / generated-sources / archetype
Java Developer Conference 2010

60. IDE Support
Java Developer Conference 2010

61. Maven with IDEs
• Eclipse 3.5 Galileo
Eclipse IAM (formerly Q4E)
m2eclipse
maven-eclipse-plugin @ central-repo
• NetBeans 6.8
out of the box - embedded maven
• Intellij IDEA 9
out of the box - embedded maven
maven-idea-plugin @ central-repo
Java Developer Conference 2010

62. m2eclipse
• Eclipse plug-in from Sonatype
• Checkout maven project from Source Control
• Create new Project from Archetype
• Nice POM Editor
• Embedded Maven Console
• You might need subclipse & AJDT plugins.
• A quick Demo...
Java Developer Conference 2010

63. INCREASE
YOUR
MOJOTIVITY
Java Developer Conference 2010

64. Maven Help Plugin
mvn help:describe -Dplugin=<anygoal>
• Lists & describes the goals of the plugin
mvn help:system
• Lists system properties and env. variables
Java Developer Conference 2010

65. Use Profiles
• Create profiles for : development, staging and production
<profile>
<id>production</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<debug>false</debug>
<optimize>true</optimize>
</configuration> <profiles>
</plugin> <profile>
</plugins>
<activation>
</build>
</profile> <jdk>[1.3,1.6)</jdk>
</activation>
...
• invoke like </profile>
$ mvn <phase> -Pproduction
Java Developer Conference 2010

66. Property References
env.*
environment variables exposed by OS or Shell
${env.JAVA_HOME}
project.*
POM elements
${project.groupId} ${project.parent.groupId}
settings.*
Maven settings.xml properties
${settings.localRepository}
${foo} <properties>
<foo>bar</foo>
</properties>
Java Developer Conference 2010

67. Debugging Maven
• Output full error stacktrace
mvn <anygoal> -e
• Output for debugging
mvn <anygoal> -X
Always use when submitting questions or bug reports.
Java Developer Conference 2010

68. GOOD PRACTICES
• If you are starting from scratch, start with MAVEN..!
• A Repository Manager is a MUST
Have a Corporate Repo
• Have a company specific POM, try to keep your POM
simple
portable avoid any hardcoding..
• Use profiles...
• Use <dependencyManagement />
coerce Maven to use a particular version
enforce consistency within projects
Java Developer Conference 2010

69. GOOD PRACTICES
• Make it so that you can,
Release early, Release Often
- Quick, easy and reproducible releases
- CI tool integration
• Each project should output its own artifact (SoC)
• Use IDE integrations
from stone age to iron age...
•Do not ignore or skip your tests!
-Dmaven.test.skip=true
-Dmaven.test.failure.ignore=true
Java Developer Conference 2010

70. Online Resources
http://www.sonatype.com/book
Maven: The Complete Reference
Maven By Example
m2eclipse Book
Nexus Book
http://www.maestrodev.com/better-build-maven
Better Builds with Maven
Java Developer Conference 2010

71. Questions
Java Developer Conference 2010

72. Thank you
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