How to best define .m2 local maven repo path in multi-branch projects/Jenkinsfile?

[ST]

Hi!

I am migrating our build pipeline from a set of maven-type jobs to a multi-branch project defined in a Jenkinsfile, and I am wondering how people solve the .m2 problem ? I cannot see any way to configure every job/branch to have its own private .m2 repo through a comfortable boolean config option, did I miss something?

Otherwise I guess the solution is to set the .m2 path via -Dmaven.repo.local. But how to best define this path so it is different for every job/branch? Put it under /tmp/<GIT_BRANCH_NAME>? Any other more elegant options?

Best regards,

 stefan.

[Álvaro Lobato]

Hello Stefan,

An easy way to do it is to use the new Pipeline Maven plugin. It allows you to define a local maven repository, relative to to the workspace of the job or with an absolute path, you can also use shell variables expansion. In your case would be as easy as using a job similar to this one:

withMaven(mavenLocalRepo: '.repository') {
        // Run the maven build
        sh "mvn clean package" 

} 

This will execute the specified mvn command with a local repo on the folder .repository inside the workspace.

You can also use other parameters to customise you maven behaviour or even auto-install it.  If you want more information check the plugin wiki page or this thread from the forum.

It is still in beta phase, but working well so far.

Cheers

Alvaro

[ST]

Hi Alvaro,

Thanks for your reply. So in a multi-branch project, do you have any better proposal than to use the following?

withMaven(mavenLocalRepo: "/tmp/${env.BRANCH_NAME}/.repository") {
        

// Run the maven build
        sh "mvn clean package" 

} 

Since we're "mvn install"-ing snapshots, we cannot reuse the same .m2 repo for different branches...

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[Álvaro Lobato]

I think that multibranch have a workspace for each branch (I'm away from my computer and can't check it) if that is the case it is safe to just use .repository, if not you can use what you propose or .reposotory_${env.BRANCH_NAME} which will make it relative and it should be persistent between executions.

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[Nazarii Bardiuk]

We also have similar situation with multiple branches and the same maven snapshot version.

Stefan, did you manage to run builds for separate branches without version clashes?

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[David Karlsen]

I keep it in the workspace so it disappears with it 

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