Improve duplicated modules error
--------------------------------

                 Key: MNG-4402
                 URL: http://jira.codehaus.org/browse/MNG-4402
             Project: Maven 2
          Issue Type: Bug
          Components: Errors
    Affects Versions: 3.0
            Reporter: Marvin Froeder


Maven should better scream at the duplicate module in the originating POM to 
catch the issue at its source.

Right now it does print
{code}
[INFO] Scanning for projects...
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:4
.0-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-sandbox\flexmojos-generator-compiler-iface\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:4.0-S
NAPSHOT, 
F:\flexmojos-aggregator\flexmojos-sandbox\flexmojos-generator-compiler-iface\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-sandbox\flexmojos-generator-compiler-iface\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:4.0-SNAPSHO
T, 
F:\flexmojos-aggregator\flexmojos-sandbox\flexmojos-generator-compiler-iface\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-compiler-iface:4.0-SNAPS
HOT, 
F:\flexmojos-aggregator\flexmojos-sandbox\flexmojos-generator-compiler-iface\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-api:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT
, F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:
\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F
:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:\flexm
ojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:\fle
xmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:
4.0-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0
-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-SNAPSH
OT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:
4.0-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0
-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-SNAPSH
OT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-constraints:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNA
PSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAPSHOT,
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAPSHOT
, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-api:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT
, F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:
\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F
:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:\flexm
ojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-api:4.0-SNAPSHOT, F:\fle
xmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:
4.0-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0
-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-SNAPSH
OT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:
4.0-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0
-SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-SNAPSH
OT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-generator-constraints:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-
SNAPSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAP
SHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNA
PSHOT, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAPSHOT,
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAPSHOT
, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
[WARNING]
[WARNING] Some problems were encountered while building the effective model for 
org.sonatype.flexmojos:flexmojos-tester:jar:4.0-SNAPSHOT
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-checkstyle-plugin @ 
org.sonatype.flexmojos:flexmojos-tester:4.0-SNAPSHOT, F:\fl
exmojos-aggregator\flexmojos-testing\flexmojos-tester\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-plugin-plugin @ 
org.sonatype.flexmojos:flexmojos-tester:4.0-SNAPSHOT, F:\flexmo
jos-aggregator\flexmojos-testing\flexmojos-tester\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.apache.maven.plugins:maven-javadoc-plugin @ 
org.sonatype.flexmojos:flexmojos-tester:4.0-SNAPSHOT, F:\flexm
ojos-aggregator\flexmojos-testing\flexmojos-tester\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:taglist-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-tester:4.0-SNAPSHOT, F:\flexmojos-ag
gregator\flexmojos-testing\flexmojos-tester\pom.xml
[WARNING] 'reporting.plugins.plugin.version' is missing for 
org.codehaus.mojo:changelog-maven-plugin @ 
org.sonatype.flexmojos:flexmojos-tester:4.0-SNAPSHOT, F:\flexmojos-
aggregator\flexmojos-testing\flexmojos-tester\pom.xml
[WARNING]
[WARNING] It is highly recommended to fix these problems because they threaten 
the stability of your build.
[WARNING]
[WARNING] For this reason, future Maven versions might no longer support 
building such malformed projects.
[WARNING]
[ERROR] Two or more projects in the reactor have the same identifier, please 
make sure that <groupId>:<artifactId>:<version> is unique for each project: 
{org.sonatype.fle
xmojos:flexmojos-generator:4.0-SNAPSHOT=[F:\flexmojos-aggregator\flexmojos-generator\pom.xml,
 F:\flexmojos-aggregator\flexmojos-generator\pom.xml], org.sonatype.flexmojos
:flexmojos-generator-api:4.0-SNAPSHOT=[F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-api\pom.xml,
 F:\flexmojos-aggregator\flexmojos-generator\flexmojos-
generator-api\pom.xml], 
org.sonatype.flexmojos:flexmojos-generator-graniteds-1.1.0:4.0-SNAPSHOT=[F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds
-1.1.0\pom.xml, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-1.1.0\pom.xml],
 org.sonatype.flexmojos:flexmojos-generator-graniteds-2.0.0:4.0-S
NAPSHOT=[F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-graniteds-2.0.0\pom.xml,
 F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-granited
s-2.0.0\pom.xml], 
org.sonatype.flexmojos:flexmojos-generator-constraints:4.0-SNAPSHOT=[F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml
, 
F:\flexmojos-aggregator\flexmojos-generator\flexmojos-generator-constraints\pom.xml]}
 [0]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e 
switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please 
read the following articles:
[ERROR] [0] 
http://cwiki.apache.org/confluence/display/MAVEN/DuplicateProjectException
{code}

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