When you try to execute the mvn deploy command, you may encounter the error:
Failed to deploy artifacts: Could not find artifact com.example:artifact:jar:0.0.1 in internal.repo (http://example.com) -> [Help 1]
The error could actually means (thanks to randomsimon):
Failed to deploy artifacts: Could not find internal.repo (http://example.com) -> [Help 1]
That is, maven cannot find the repository at the specified url. Check, that the url of the repository is correct, and in general it exists and specified.
A repository url can be specified via -DaltDeploymentRepository flag:
mvn deploy -DaltDeploymentRepository=<repo_id>::default::<repo_url> ...
If you still have any questions, feel free to ask me in the comments under this article, or write me on firstname.lastname@example.org.