In a nice tradition of answering one's own questions... ;)
Jason't other thread about site goal and similar symptoms gave me another
idea, which finally shaped into a solution. This could be included in the
Groovy m2 plugins development guide, smth under 'Building Groovy m2 plugins
in a reactor/multi-module project'.
Full poms are available at the above mentioned SVN locations, I'll post
snippets here only.
Parent:
=======
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-plugin-plugin</artifactId>
<configuration>
<!--
*MUST* override the extractors to disable everything
except java, as groovy can handle both java and
groovy files.
Duplicate processing chokes maven.
Java is the default for plugin implementation
language,
overridable in individual projects.
-->
<extractors>
<extractor>java</extractor>
<!-- add custom default extractors here if needed
-->
<!-- extractor>bsh</extractor -->
</extractors>
</configuration>
<dependencies>
<dependency>
<groupId>org.codehaus.mojo</groupId>
<artifactId>groovy-mojo-tools</artifactId>
<version>1.0-alpha-3-SNAPSHOT</version>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
The key here is the dependency of the plugin AND extractor configuration.
It's critical to not disable groovy extractor for plugins implemented in
Java, as maven will try to process them with both java and groovy and fail.
Child m2 plugin project implemented in groovy (the same build/plugins
section):
===============================
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-plugin-plugin</artifactId>
<configuration>
<extractors>
<!--
*MUST* override the extractors to disable
everything
except groovy, as groovy can handle both java
and groovy files.
Duplicate processing chokes maven.
The rest of the config is inherited.
-->
<extractor>groovy</extractor>
</extractors>
</configuration>
</plugin>
Hope it saves much pain to others. And the best part is those settings are
available in released m2 plugins, which lessens the snapshot pain.
Cheers!
Andrew
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