Maven

Resources

Maven is a very wide spread Java build system. It is presently not supported in the eclasses but in many cases it is possible to translate a package's pom.xml file into an ebuild using the java-pkg-simple.eclass.

As of 2019-06-23, Gentoo only has a binary ebuild for Maven (dev-java/maven-bin) in the Gentoo ebuild repository. However dev-java/maven is still not available bug #63285

Usage

mvn dependency:tree

Maven can be used to get the dependency tree of a new package version in order to know what dependencies need to get updated or packaged.

To do so, the package should first be downloaded and unpacked.

user $

wget https://github.com/FasterXML/jackson-databind/archive/refs/tags/jackson-databind-2.13.0.tar.gz

user $tar xzf jackson-databind-2.13.0.tar.gz

Then step into the new directory and ask for the dependency tree

user $cd jackson-databind-jackson-databind-2.13.0

user $mvn dependency:tree

[INFO] Scanning for projects...
[INFO] Inspecting build with total of 1 modules...
[INFO] Installing Nexus Staging features:
[INFO]   ... total of 1 executions of maven-deploy-plugin replaced with nexus-staging-maven-plugin
[INFO] 
[INFO] ------------< com.fasterxml.jackson.core:jackson-databind >-------------
[INFO] Building jackson-databind 2.13.0
[INFO] -------------------------------[ bundle ]-------------------------------
[INFO] 
[INFO] --- maven-dependency-plugin:3.1.2:tree (default-cli) @ jackson-databind ---
[INFO] com.fasterxml.jackson.core:jackson-databind:bundle:2.13.0
[INFO] +- com.fasterxml.jackson.core:jackson-annotations:jar:2.13.0:compile
[INFO] +- com.fasterxml.jackson.core:jackson-core:jar:2.13.0:compile
[INFO] +- org.powermock:powermock-core:jar:2.0.0:test
[INFO] |  +- org.powermock:powermock-reflect:jar:2.0.0:test
[INFO] |  |  \- org.objenesis:objenesis:jar:3.0.1:test
[INFO] |  +- org.javassist:javassist:jar:3.24.0-GA:test
[INFO] |  +- net.bytebuddy:byte-buddy:jar:1.9.3:test
[INFO] |  \- net.bytebuddy:byte-buddy-agent:jar:1.9.3:test
[INFO] +- org.powermock:powermock-module-junit4:jar:2.0.0:test
[INFO] |  +- org.powermock:powermock-module-junit4-common:jar:2.0.0:test
[INFO] |  \- org.hamcrest:hamcrest-core:jar:1.3:test
[INFO] +- org.powermock:powermock-api-mockito2:jar:2.0.0:test
[INFO] |  +- org.powermock:powermock-api-support:jar:2.0.0:test
[INFO] |  \- org.mockito:mockito-core:jar:2.23.0:test
[INFO] +- javax.measure:jsr-275:jar:0.9.1:test
[INFO] \- junit:junit:jar:4.13.1:test
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  1.805 s
[INFO] Finished at: 2021-12-15T17:17:37+01:00
[INFO] ------------------------------------------------------------------------

Options

To skip tests and/or shading use the -D... syntax:

user $mvn -DskipTests -DskipShade clean package

java-ebuilder

Maven is used internally by app-portage/java-ebuilder for creation of java package ebuilds.

Google Summer of Code

Improving the support of Maven was goal of several Google Summer of Code projects:

Packages waiting for Maven support

New packages for the tree which depend on Maven are organized by the tracker ticket bug #688542.

External resources

https://www.digitalocean.com/community/tutorials/maven-commands-options-cheat-sheet