Non-resolvable parent POM: When building Maven 3 Project Site - maven-3

Question

I am currently facing the following problem with Maven 3 when I am trying to build the site. I will appreciate you help on this.
mvn clean site
..........
[INFO] Reactor Summary:
[INFO]
[INFO] Project A ......................................... SUCCESS [15.383s]
[INFO] Project B ......................................... SUCCESS [2.232s]
[INFO] My Site ........................................... FAILURE [0.105s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 24.769s
[INFO] Finished at: Fri Jun 29 14:26:04 AMT 2012
[INFO] Final Memory: 18M/150M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-site-plugin:3.1:site (default-site) on project site: SiteToolException: Unable to read local module-POM: 1 problem was encountered while building the effective model for my.com:projA:0.1-SNAPSHOT
[ERROR] [FATAL] Non-resolvable parent POM: Could not find artifact my.com:parent-pom:pom:0.1-SNAPSHOT and 'parent.relativePath' points at no local POM # line 12, column 13
[ERROR] for project my.com:projA:0.1-SNAPSHOT
.............
First here is the configuration:
Apache Maven 3.0.4 (r1232337; 2012-01-17 12:44:56+0400)
Java version: 1.7.0_04, vendor: Oracle Corporation
Default locale: en_US, platform encoding: UTF-8
OS name: "mac os x", version: "10.7.4", arch: "x86_64", family: "mac"
Nexus repository: 2.0.6
The parent POM:
<modelVersion>4.0.0</modelVersion>
<name>Parent POM</name>
<groupId>my.com</groupId>
<artifactId>parent-pom</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-site-plugin</artifactId>
<version>3.1</version>
<configuration>
<reportPlugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>2.4</version>
</plugin>
</reportPlugins>
</configuration>
</plugin>
</plugins>
</pluginManagement>
</build>
The aggregation project pom:
<modelVersion>4.0.0</modelVersion>
<name>My Site</name>
<groupId>my.com</groupId>
<artifactId>site</artifactId>
<version>0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<parent>
<groupId>my.com</groupId>
<artifactId>parent-pom</artifactId>
<version>0.1-SNAPSHOT</version>
<relativePath/>
</parent>
<modules>
<module>projA</module>
<module>projB</module>
</modules>
The pom of Project A:
<modelVersion>4.0.0</modelVersion>
<name>Project A</name>
<groupId>my.com</groupId>
<artifactId>projA</artifactId>
<version>0.1-SNAPSHOT</version>
<parent>
<groupId>my.com</groupId>
<artifactId>parent-pom</artifactId>
<version>0.1-SNAPSHOT</version>
<relativePath/>
</parent>
The pom of Project B:
4.0.0
<name>Project B</name>
<groupId>my.com</groupId>
<artifactId>projB</artifactId>
<version>0.1-SNAPSHOT</version>
<parent>
<groupId>my.com</groupId>
<artifactId>parent-pom</artifactId>
<version>0.1-SNAPSHOT</version>
<relativePath/>
</parent>
Here is the structure of the folder where I run "mvn clean site":
./pom.xml (aggregation project)
./projA/pom.xml (Project A)
./projB/pom.xml (Project B)
parent-pom is successfully deployed to NEXUS repository before the execution of mvn clean site with following command mvn deploy -DaltDeploymentRepository=snapshots::default::http://MyServer:8081/nexus/content/repositories/snapshots
And finally the problem itself:
When I run mvn clean site right after the deployment of parent-pom site is built successfully. If I delete the folder (with its content) "my" (it contains the parent-pom) from the local repository (~/.m2/repository) and then try to build the site with mvn clean site I am getting the error described at the beginning. Actually Maven downloads the parent-pom from the NEXUS. I have compared the downloaded files and files which have been generated after the deployment and have realized that few are missing, for instance maven-metadata-local.xml near to "0.1-SNAPSHOT" folder.
So when I am trying to run the site building job from Jenkins I am getting the error described above, because the parent-pom is not deployed from the machine where Jenkins run.
How can I come up with this problem or what I did wrong?
Thank you.

Answer 1

As pointed out by this answer, there is a bug in the site plugin, which only looks for dependencies in what it thinks is Maven central.
I am having the same problem in Maven 3.0.4 and site-plugin 3.3 . I also have the issue that it works in my development machine which is running Windows 7, but not in the CI-Server which is running Jenkins on Debian.

Answer 2

The problem is not in your pom files. When I built your aggregation-pom, Maven downloaded normally the parent-pom from the remote repo (after I deleted from my local repo).
Try this:
mvn -U clean install site dependency:purge-local-repository
Additionally, you could do some clean up:
remove <relativePath/> from all of them
remove <version>0.1-SNAPSHOT</version> and <groupId>my.com</groupId> from projA and ProjB (they are inherited from the parent)

Answer 3

I got the same problem... works on my developer MacBook, but fails on my Jenkins running on RHEL7 when running mvn site using maven-site-plugin:3.7. I did not test to downgrade the site plugin.
I found another solution. The problem in my case was the maven-project-info-reports-plugin especially the goal dependencies. If I skip the goal with -Dmpir.skip=true my site get's generated (without the dependencies :( report).