I would like someone to help us understand a behavior that we recently
observed in our build system. In our project POM, we don't explicitly
mention the versions for these plugins, as we expect the versions to be
inherited from SuperPOM. When I look at the effective POM for the
project, it shows the following configuration for javadoc plugin:
<plugin>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.5</version>
</plugin>
yet, when I try to build (I am using maven 2.2.1), I get this error:
[INFO] [ERROR] BUILD FAILURE
[INFO] [INFO]
------------------------------------------------------------------------
[INFO] [INFO] A required plugin was not found: Plugin could not be found
- check that the goal name is correct: Unable to download the artifact
from any repository
[INFO]
[INFO] Try downloading the file manually from the project website.
[INFO]
[INFO] Then, install it using the command:
[INFO] mvn install:install-file -DgroupId=org.apache.maven.plugins
-DartifactId=maven-javadoc-plugin -Dversion=2.8-SNAPSHOT
-Dpackaging=maven-plugin -Dfile=/path/to/file
[INFO]
[INFO] Alternatively, if you host your own repository you can deploy the
file there:
[INFO] mvn deploy:deploy-file -DgroupId=org.apache.maven.plugins
-DartifactId=maven-javadoc-plugin -Dversion=2.8-SNAPSHOT
-Dpackaging=maven-plugin -Dfile=/path/to/file -Durl=[url]
-DrepositoryId=[id]
[INFO]
[INFO]
[INFO]
org.apache.maven.plugins:maven-javadoc-plugin:maven-plugin:2.8-SNAPSHOT
[INFO]
[INFO] from the specified remote repositories:
[INFO] central (http://repo1.maven.org/maven2),
[INFO] glassfish-maven-repository
(http://maven.glassfish.org/content/groups/glassfish-group/)
We started seeing this after the maven-metadata in our nexus repo, which
is configured to proxy only released artifacts, got updated with
SNAPSHOT artifact details. The nexus repo issue has been fixed after
upgrading to 1.8.0, but what is not understood is why maven even
attempted to use 2.8-SNAPSHOT when effective pom shows the plugin
version as 2.5.
Thanks,
Sahoo
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