maven build fails due to networking problems

[Magosányi Árpád]

My package builds with maven. It fails on launchpad buildd because name resolver problems.
repo.maven.apache.org: Name or service not known

Relevant parts of the log:
mvn -Pno-unit-tests install
[INFO] Scanning for projects...
Downloading: http://repo.maven.apache.org/maven2/org/eclipse/tycho/tycho-maven-plugin/0.19.0/tycho-maven-plugin-0.19.0.pom

[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project org.rulez.magwas.zenta:parent:2.4.0.qualifier (/build/buildd/zenta-2.4.0saucy25/pom.xml) has 1 error
[ERROR] Unresolveable build extension: Plugin org.eclipse.tycho:tycho-maven-plugin:0.19.0 or one of its dependencies could not be resolved: Failed to collect dependencies for org.eclipse.tycho:tycho-maven-plugin:jar:0.19.0 (): Failed to read artifact descriptor for org.eclipse.tycho:tycho-maven-plugin:jar:0.19.0: Could not transfer artifact org.eclipse.tycho:tycho-maven-plugin:pom:0.19.0 from/to central (http://repo.maven.apache.org/maven2): repo.maven.apache.org: Name or service not known: Unknown host repo.maven.apache.org: Name or service not known -> [Help 2]

full build log:
https://launchpadlibrarian.net/161491434/buildlog_ubuntu-saucy-amd64.zenta_2.4.0saucy25_FAILEDTOBUILD.txt.gz

[William Grant (wgrant)]

For security and reproducibility reasons, Launchpad builds have no access to the Internet. They can only depend on code in the Ubuntu primary archive and the PPA itself.

[Magosányi Árpád (mag-magwas)]

Understood. But this answer without any further info excludes a whole class of software (java built with maven) from launchpad.
Please propose a way to build with maven in launchpad.

[William Grant (wgrant)]

https://wiki.debian.org/Java/Packaging describes techniques for packaging Java applications. One would conventionally package the dependencies like any other piece of software, and then Build-Depend on them as with any non-Java software.

[Magosányi Árpád (mag-magwas)]

thanks