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

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)