[FIXED] Building two git repositories with Jenkins

Issue

I need to build two Maven projects which are available on Github. The first project produces a library which is needed by the second. What is the recommended option to do it in Jenkins ?
Create a shell script which checkout and build both projects (in the correct order).
Use a pipeline ? If you could provide any example/ relevant link that would be great. Thanks

Solution

You can achieve using 2 (upto my knowledge) options. Lets consider project A which builds libraries and project B is the dependent. I described below two options by considering two constraints.

1. Project B should be built whenever Project A is built
2. Project B can also be built alone if there is only changes with Project B but not with A

Option 1: You have to create two "Maven Build jobs" for Project A & B. In Project B, you have to specify "Build whenever a SNAPSHOT dependency is built" under "Build Triggers".

This only applies when project B pom.xml has dependency of Project A built artifacts and the artifacts are SNAPSHOT. Below is the image of the same.

Options 2: You can create two Freestyle job for both Project A & B. Define Project B is downstream for Project A ( It can also be done vice versa ) using "Build Other Projects" under "Post-Build Options" of Project A.

And you can copy artifacts from Project A to Project B using Copy Artifact Plugin

Exception: Ideally the above step is not necessary, if your Project A artifacts are installed on $HOME/.m2/repository and Project B dependency defined in pom.xml (or) both project A & B are using Private Maven Repository option.

Assumption: I hope using single pipeline, it will be hard to manage this scenario. Though I expect somebody else will write with pipeline example to enlighten me as well :)

Answered By - Fidel
Answer Checked By - Timothy Miller (JavaFixing Admin)