Maven Tips & Tricks

Presentation done during lunch break at SRMvision. A quick summary of Maven best practices and useful commands to know when dealing with Maven.

Transcript

1. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Maven Tips & Tricks Brown Bag Lunch - January 2013 1
2. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Lifecycle 1. process-resources 2. compile 3. process-test-resources 4. test-compile 5. test 6. package 7. install 8. deploy 2
3. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Search engines • http://search.maven.org/ • search through Maven Central • http://mvnrepository.com/ • http://nexus.srm • in house repository 3
4. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version 4
5. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version • follows package naming convention • reverse FQDN 5
6. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version • short explicit names are the best 6
7. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version • optional • allows to specify special versions 7
8. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version • one of jar,pom,war,ear... • determines the nature of the dependency 8
9. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Artifacts naming • groupId:artifactId:[classifier:]type:version • version number (dot formatted) • -SNAPSHOT are in development dep. 9
10. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Project inheritance • Allows to group common configuration • repositories • codestyle... • Ease project understanding 10
11. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • Scopes • compile (default) : required for the app • runtime : only necessary at runtime • provided : available by the container • test : required for testing phase • system : absolute path (avoid this) 11
12. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • Don’t Repeat Yourself • Make your dependencies consistent 12
13. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • Super POM does the dependenciesManagement • <groupId>, <artifactId>, <version>, <scope>, <exclusions> 13
14. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com 14
15. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • POMs inherit the Super POM • only use <dependencies> • <groupId>, <artifactId> • specific <scope> 15
16. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com 16
17. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • Plugins follow the same rule • <pluginManagement> in Super POM • common <configuration> 17 Always fix plugins’ versions
18. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Dependencies • Plugins follow the same rule • <plugin> in children • specific <configuration> 18
19. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Properties • Ease dependency upgrade • only one value to update • See all dependencies versions at once 19
20. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Troubleshoot • Debug • mvn -X • Work offline • mvn -o | --offline 20
21. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Troubleshoot • Get the computed POM • mvn help:effective-pom • Get the dependency tree • mvn dependency:tree 21
22. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Clean local repository • wget https://raw.github.com/CedricGatay/small- scripts/master/groovy/CleanDir.groovy • groovy CleanDir.groovy • groovy -DdryRun=false CleanDir.groovy 22
23. Pulling ITSM together Cedric Gatay - c.gatay@srmvision.com Resources • Apache Maven http://maven.apache.org/ • Maven dependency plugin http://maven.apache.org/plugins/maven-dependency-plugin/ • CleanDir groovy script https://raw.github.com/jettro/small-scripts/master/groovy/CleanDir.groovy 23