The desired archetype does not exist - maven

Question

When calling Maven to generate an archetype following the instructions at https://confluence.sakaiproject.org/display/BOOT/Sakai+Spring+MVC+Maven+Archetype, Maven complains about the archetype being inexistent, even though the file is located in the given archetype respository: https://source.sakaiproject.org/maven2/org/sakaiproject/maven-archetype/sakai-spring-maven-archetype/1.2/sakai-spring-maven-archetype-1.2.pom.
Maven version is:
>mvn -version
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
This is what happens - it looks like the -DarchetypeRepository parameter is ignored:
> mvn archetype:generate -DarchetypeGroupId=org.sakaiproject.maven-archetype
-DarchetypeArtifactId=sakai-spring-maven-archetype
-DarchetypeVersion=1.2
-DarchetypeRepository=https://source.sakaiproject.org/maven2
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------< org.apache.maven:standalone-pom >-------------------
[INFO] Building Maven Stub Project (No POM) 1
[INFO] --------------------------------[ pom ]---------------------------------
[INFO]
[INFO] >>> maven-archetype-plugin:3.1.2:generate (default-cli) > generate-sources # standalone-pom >>>
[INFO]
[INFO] <<< maven-archetype-plugin:3.1.2:generate (default-cli) < generate-sources # standalone-pom <<<
[INFO]
[INFO]
[INFO] --- maven-archetype-plugin:3.1.2:generate (default-cli) # standalone-pom ---
[INFO] Generating project in Interactive mode
[WARNING] Archetype not found in any catalog. Falling back to central repository.
[WARNING] Add a repository with id 'archetype' in your settings.xml if archetype's repository is elsewhere.
[WARNING] The POM for org.sakaiproject.maven-archetype:sakai-spring-maven-archetype:jar:1.2 is missing, no dependency information available
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.395 s
[INFO] Finished at: 2020-01-11T12:24:20+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:3.1.2:generate (default-cli) on project standalone-pom: The desired archetype does not exist (org.sakaiproject.maven-archetype:sakai-spring-maven-archetype:1.2) -> [Help 1]
[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/MojoFailureException

Answer 1

Turns out that Maven 3 changed the way archetype repositories are integrated. The -DarchetypeRepository parameter is not there anymore. Instead, archteype repositories need to be added to settings.xml:
<profiles>
<profile>
<!-- the profile id is arbitrary -->
<id>sakai</id>
<repositories>
<repository>
<!-- the repository id has to be named: archetype -->
<id>archetype</id>
<name>Repository for Sakai archetypes</name>
<url>https://source.sakaiproject.org/maven2/</url>
<releases>
<enabled>true</enabled>
<checksumPolicy>fail</checksumPolicy>
</releases>
<snapshots>
<enabled>true</enabled>
<checksumPolicy>warn</checksumPolicy>
</snapshots>
</repository>
</repositories>
</profile>
</profiles>
<!-- The profile needs to be added to activeProfiles in order to be taken into account -->
<activeProfiles>
<activeProfile>sakai</activeProfile>
</activeProfiles>