Major I follow the instruction in Building Jenkins
I configure maven according to Plugin tutorial:SettingUpEnvironment
I install the latest version of nexus and add all repos as described in
Jenkins Development Environment with Nexus
I add repo.jenkins-ci.org as Nexus/maven doesn't find anything jenkins related otherwise.
when I run:
mvn -Plight-test install
I get:
mvn -Plight-test install [INFO] Scanning for projects... Downloading: http://localhost:8081/nexus/content/groups/public/org/jenkins-ci/tools/maven-hpi-plugin/1.78/maven-hpi-plugin-1.78.pom [WARNING] The POM for org.jenkins-ci.tools:maven-hpi-plugin:jar:1.78 is missing, no dependency information available Downloading: http://localhost:8081/nexus/content/groups/public/org/jenkins-ci/tools/maven-hpi-plugin/1.78/maven-hpi-plugin-1.78.jar [ERROR] The build could not read 2 projects -> [Help 1] [ERROR] [ERROR] The project org.jenkins-ci.main:maven-plugin:1.479-SNAPSHOT (/Users/admin/Documents/workspace/jenkins/maven-plugin/pom.xml) has 2 errors [ERROR] Unresolveable build extension: Plugin org.jenkins-ci.tools:maven-hpi-plugin:1.78 or one of its dependencies could not be resolved: Could not find artifact org.jenkins-ci.tools:maven-hpi-plugin:jar:1.78 in nexus (http://localhost:8081/nexus/content/groups/public) -> [Help 2] [ERROR] Unknown packaging: hpi @ line 36, column 14 [ERROR] [ERROR] The project org.jenkins-ci.main:ui-samples-plugin:1.479-SNAPSHOT (/Users/admin/Documents/workspace/jenkins/ui-samples-plugin/pom.xml) has 2 errors [ERROR] Unresolveable build extension: Plugin org.jenkins-ci.tools:maven-hpi-plugin:1.78 or one of its dependencies could not be resolved: Could not find artifact org.jenkins-ci.tools:maven-hpi-plugin:jar:1.78 in nexus (http://localhost:8081/nexus/content/groups/public) -> [Help 2] [ERROR] Unknown packaging: hpi @ line 36, column 14 [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException [ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException
If I search nexus I find the jar for maven-hpi-plugin-1.78. I download it and place it into my local repositor (on may workstation). The error persists stating that it's looking for the pom file? I look through all versions and none have a pom file.
[JENKINS-14831] Environment setup fails & unable to build Jenkins
Daniel Petisme
added a comment - Go to : [ http://localhost:8081/nexus/content/groups/public/] and try to browse to org, then jenkins-ci, tools, meven-hpi-plugin.
If you can't see these folders is cause the Jenkins Release repository is not public and so Maven can't acess to the jars.
The Jenkins Release repository should be in added in your Public Repositories
http://www.sonatype.com/books/nexus-book/reference/config-sect-repo-group.html
Daniel Petisme
added a comment - Go to : [ http://localhost:8081/nexus/content/groups/public/ ] and try to browse to org , then jenkins-ci , tools , meven-hpi-plugin .
If you can't see these folders is cause the Jenkins Release repository is not public and so Maven can't acess to the jars.
The Jenkins Release repository should be in added in your Public Repositories
http://www.sonatype.com/books/nexus-book/reference/config-sect-repo-group.html Resolving as incomplete, as there is no response from the reporter to the comments.
Please reopen if there is still an issue.
Dave Kelsey
added a comment - I've reported this issue before. I follow the instruction to build Jenkins explicitly and it does not work.
Thanks for responding. I'll have a looks at what you wrote and see if it makes a difference.
Dave Kelsey
added a comment - I've reported this issue before. I follow the instruction to build Jenkins explicitly and it does not work.
Thanks for responding. I'll have a looks at what you wrote and see if it makes a difference. 
removed github from component.