maven-deploy-plugin version 3.0.0-M1 deploy fails with 401 ReasonPhrase: Unauthorized

Symptom

Maven 2 artifact deployments specifically using the 3.0.0-M1 version of the maven-deploy-plugin may fail with a message:

ArtifactDeployerException: Failed to deploy artifacts: Could not transfer artifact 

and a reason:

Return code is: 401, ReasonPhrase: Unauthorized.

Cause

A bug has been reported against the maven-deploy-plugin with this new problem:

https://issues.apache.org/jira/browse/MDEPLOY-244

The 3.0.0-M1 release was late September 2018.

The latest previous release of the maven-deploy-plugin was over 4 years prior. The latest plugin release version will automatically be used if the project POM or Maven invocation does not explicitly state a version of the plugin to use.

Workaround

Best practices to ensure repeatable Maven builds require locking down Maven plugin versions using versions defined in the pluginManagement section of project parent POM files.

https://maven.apache.org/pom.html#Plugin_Management

The last release version of the maven-deploy-plugin prior to 3.0.0-M1 without this bug was version 2.8.2.

To enforce an earlier version of the maven-deploy-plugin be used, define such a POM section such as below:

<project xmlns="http://maven.apache.org/POM/4.0.0"
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
                      https://maven.apache.org/xsd/maven-4.0.0.xsd">
  ...
  <build>
    ...
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.maven.plugins</groupId>
          <artifactId>maven-deploy-plugin</artifactId>
          <version>2.8.2</version>
        </plugin>
      </plugins>
    </pluginManagement>
    ...
  </build>
</project>

If you are invoking the deploy-file goal at invocation time, then use the full plugin coordinate to enforce the plugin version:

> mvn org.apache.maven.plugins:maven-deploy-plugin:2.8.2:deploy-file ...

 

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