I'm trying to execute mvn release:perform on three projects that I have released to our Nexus server many times in the past. Suddenly today, for no apparent reason, all releases are failing to execute goal org.apache.maven.plugins:maven-javadoc-plugin:2.10:jar (attach-javadocs).
With full stack tracing and debug logging turned on (-e and -X), I see several hundred lines of errors about missing packages:
...
package org.apache.http does not exist
package org.slf4j does not exist
package org.joda.time does not exist
...
However, all of these packages are in both my local repository and Nexus server. Moreover, I don't get any of these errors from mvn clean install. All the projects (Java web apps) actually launch from IntelliJ without issues. So clearly, I'm not actually missing hundreds of packages.
What could be preventing mvn release:perform from finding these packages when mvn clean install and mvn release:prepare don't have any problems?
There seems to be a cascade of issues regarding update to maven-javadoc-plugin. See https://issues.apache.org/jira/browse/MJAVADOC-408.
I can see some benefit in having mvn use the latest versions of "built-in" plugins if not otherwise specified (vs. a "pinned version" for a given Maven version), but it means plug-in maintainers are obliged to do regression testing against every version of Maven upon a plugin release. Maybe something was missed.
One workaround would be to explicitly specify the previous version of maven-javadoc-plugin in your organization's super POM, or alternatively, the project POM if it's not possible to change the super POM in a hurry:
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.9.1</version>
</plugin>
</plugins>
</pluginManagement>
Our CI rig (Jenkins) hit the same problem today. Hopefully a new maven-javadoc-plugin will get pushed with it's dependency tree updated (if that is indeed the issue). FWIW, we were on 3.0.5 (ya, sad for a variety of reasons).
This whole hubub seems to have originated in the response of maven-javadoc-plugin maintainers to an yet-to-be-closed issue in java-1.8.0-openjdk in MJAVADOC-398. I have no idea why anyone would release a breaking work-around for a unresolved downstream project defect.
MJAVADOC-406 has been resolved and there is a 2.10.1 version of maven-javadoc-plugin available in Maven Central and likely many repositories near you.
Builds with un-pinned javadoc plugin version should be returning to normal now.
Maven-folk, you have been warned. Lock down your plug-in dependencies because they could go rogue.
P.S., MJAVADOC-408 has been closed as a duplicate of MJAVADOC-407.