Duplicate plugin entries in effective POM

[Raffa News <ra...@googlemail.com>]

Hi,

we are currently upgrading our projects from Maven 2.2.1 to Maven 3.0.3.
At the moment we are running in some problems which involve duplicate 
entries for the Maven Dependency Plugin(Version 2.2) in the effective POM.

Inside a profile 'xyz' we definded the Maven-Dependency-Plugin. The 
configuration with the artifactItems will be generate during the build 
process by a self-developed plugin. Our POM looks like this:

[...]
<profile>
   <id>xyz</id>
   [...]
   <build>
     <plugins>
       [...]
       <plugin>
         <artifactId>maven-dependency-plugin</artifactId>
         <executions>
           <execution>
             <id>copy-stuff</id>
             <phase>validate</phase>
             <goals>
               <goal>copy</goal>
             </goals>
             <configuration>
               <silent>true</silent>
             </configuration>
           </execution>
           <execution>
             <id>copy-common-stuff</id>
             <phase>validate</phase>
             <goals>
               <goal>copy</goal>
             </goals>
             <configuration>
               <silent>true</silent>
             </configuration>
           </execution>
         </executions>
       </plugin>
       [...]
     </plugins>
   </build>
</profile>
[...]

The effective POM for this project has two entries for the Maven 
Dependency Plugin. The first entry (directly locate under <build>) will 
work properly because the right configuration and artifactItems were 
generated. The second entry remains under <profile> without any 
configuration.
And that seems to be the problem because the Maven build failed with a 
PluginParameterException ('The parameters 'artifactItems' ... are 
missing or invalid.').

Surprisingly the Maven 2 build generates the same effective POM and 
finishes without any problems.

Any hints are appreciated.

Thanks,
Raffa

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