How to see what Maven is sending to a server during deploy? - maven

Question

I'm trying to use Github's new Actions CI server to deploy packages to Github's new packages feature. It's not going well.
I think it's all set up correctly, but I get this error:
Failed to execute goal org.apache.maven.plugins:maven-deploy-plugin:2.7:deploy
(default-deploy) on project myproject: Failed to deploy artifacts: Could not
find artifact com.mycompany:myproject:pom:1.5 in github
(https://maven.pkg.github.com/mycompany/mycompany_repository) -> [Help 1]
This happens after it appears to upload that same pom successfully:
Uploading to github: https://maven.pkg.github.com/mycompany/mycompany_repository
/com/mycompany/myproject/1.5/myproject-1.5.pom
Progress (1): myproject-1.5.pom (4.1/6.1 kB)
Progress (1): myproject-1.5.pom (6.1 kB)
So, it looks to me like it is successfully uploading the pom, but then it fails to download the same pom a few seconds later.
I'm running the deploy with debug switches on: mvn -X -e deploy, but I can't see the exact http commands that Maven is sending to the server.
How do I debug this? Is there some Maven/Aether transport or something that will log what is going on under the covers?

Answer 1

In case anyone else lands here looking for a solution to OPs issue publishing to github, I had a similar issue and found that the URLs needed in settings.xml and pom.xml are inconsistent. In your settings.xml, the repo URL needs to be of the form https://maven.pkg.github.com/myuser/com/mycompany/mypackage, whereas in your project's pom file, it needs to be of the form https://maven.pkg.github.com/myuser/mypackage. So, for example, your settings.xml file in ~/.m2 would look something like this:
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
http://maven.apache.org/xsd/settings-1.0.0.xsd">
<activeProfiles>
<activeProfile>github</activeProfile>
</activeProfiles>
<profiles>
<profile>
<id>github</id>
<repositories>
<repository>
<id>central</id>
<url>https://repo1.maven.org/maven2</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>false</enabled></snapshots>
</repository>
<repository>
<id>github</id>
<name>GitHub Apache Maven Packages</name>
<url>https://maven.pkg.github.com/myuser/com/mycompany/mypackage</url>
<releases><enabled>true</enabled></releases>
<snapshots><enabled>false</enabled></snapshots>
</repository>
</repositories>
</profile>
</profiles>
<servers>
<server>
<id>github</id>
<username>myuser</username>
<password>mypersonalaccesstoken</password>
</server>
</servers>
</settings>
Whereas the pom.xml file in the root of your project would need to look like this:
<project>
...
<groupId>org.mycompany</groupId>
<artifactId>mypackage</artifactId>
<version>1.0.0</version>
...
<distributionManagement>
<repository>
<id>github</id>
<name>GitHub Apache Maven Packages</name>
<url>https://maven.pkg.github.com/myuser/mypackage</url>
</repository>
</distributionManagement>
...
</project>
Other than this minor (but crucial) detail, my steps were the same as those outlined here. This allowed me to publish my Maven package to github package registry.

Answer 2

You can enable debug logging in the workflows.
Just add the secret:
ACTIONS_RUNNER_DEBUG
And set to true
See a similar answer here

Answer 3

I just spend 3 hours debugging why the guide on the page did not work for me. If you are following the guide posted here 1.
OWNER is your github username, and REPOSITORY is - you guessed it, the repo name.
Just remember to use lowercase in both OWNER and REPOSITORY.

Answer 4

When generating the personal access token, make sure the scopes for the token are the repo:* scopes as well as the more obvious write:packages and read:packages scopes (do not disable the repo scopes)
Otherwise it does just that

Answer 5

The following solution works for me:
Create a repository for packages e.g. maven-packages
Add <server></server> settings under <servers> in settings.xml: (do this per id used below)
<server>
<id>github</id>
<username>YOUR GITHUB USERNAME</username>
<password>A GITHUB TOKEN YOU CREATE FOR PUBLISHING PACKAGES</password>
</server>
Do NOT add <activeProfiles>, <profile> or <repositories> to settings.xml (only add <server> elements) as this is redundant for publishing and I am adding them to consuming projects' maven.xml so no need for duplication.
Add repository/ies to distributionManagement in pom.xml as follows:
<distributionManagement>
<snapshotRepository>
<id>github-snapshot</id>
<name>GitHub snapshot</name>
<url>https://maven.pkg.github.com/OWNER/maven-packages/</url>
<uniqueVersion>true</uniqueVersion>
</snapshotRepository>
<repository>
<id>github-release</id>
<name>GitHub release</name>
<url>https://maven.pkg.github.com/OWNER/maven-packages/</url>
<uniqueVersion>false</uniqueVersion>
</repository>
</distributionManagement>
Where OWNER is the GitHub account your project is / projects are under and maven-packages is the repositories you want to publish you project(s) to.
This enables using a dedicated repository for listing packages instead of publishing each project's package to a different (its own) repository, making consumption of multiple packages from your GitHub account easier, as you only need to configure a single repository for these packages:
<repositories>
<repository>
<id>github</id>
<name>GitHub</name>
<url>https://maven.pkg.github.com/OWNER/maven-packages/</url>
</repository>
</repositories>
Note: in the <servers> section of your settings.xml define a <server> per id used in repositories and distributionManagement e.g. github-snapshot, github-release, github in the above examples.