You can bind the maven-resources-plugin
to the prepare-package
phase to achieve copying annotation sources before packaging proper:
<build>
<plugins>
<plugin>
<artifactId>maven-resources-plugin</artifactId>
<executions>
<execution>
<id>copy-annotations</id>
<phase>prepare-package</phase>
<goals>
<goal>copy-resources</goal>
</goals>
<configuration>
<resources>
<resource>
<directory>target/generated-sources/annotations</directory>
</resource>
</resources>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
...
I hope that helps.
Cheers,