Reguel Wermelinger created MDEP-458:
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             Summary: overwriteIfNewer forces not needed overwrite of already 
existing artifacts
                 Key: MDEP-458
                 URL: https://jira.codehaus.org/browse/MDEP-458
             Project: Maven Dependency Plugin
          Issue Type: Bug
          Components: copy-dependencies
    Affects Versions: 2.8, 2.9
         Environment: Win7 x64, MVN 3.0.5, Java 7.0.51
            Reporter: Reguel Wermelinger
            Priority: Minor
         Attachments: overwriteIfNewer-sample.zip

The _<overwriteIfNever/>_ property does not work for classifier 
_<classifier>sources</classifier>_ . As soon as the overWriteIfNever property 
is enabled, the artifacts with classifier "sources" are always overwritten. So 
not needed files are written very often to the disk. 

The flag seems to work as expected for executions where no classifier is 
specified. 

See the attached sample project where execution "thirdparty" can handle 
overwriteIfNever correctly. While the execution "thirdparty.sources" always 
copies files to the disk:

{{[INFO] --- maven-dependency-plugin:2.9-SNAPSHOT:copy-dependencies 
(thirdparty) @ ch.ivyteam.testarea.overwrite ---
[INFO] junit:junit:jar:3.8.1 already exists in destination.
[INFO] 
[INFO] --- maven-dependency-plugin:2.9-SNAPSHOT:copy-dependencies 
(thirdparty.sources) @ ch.ivyteam.testarea.overwrite ---
[INFO] Copying junit-3.8.1-sources.jar to 
D:\dev\trunk\real_workspaceKepler\ch.ivyteam.testarea.overwrite\lib\mvn-src\junit-3.8.1-sources.jar
}}

The not yet released version 2.9 in use was: 
maven-dependency-plugin-2.9-20140907.174645-631



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