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https://jira.codehaus.org/browse/MDEP-259?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=292309#comment-292309
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Hu weisong commented on MDEP-259:
---------------------------------
I met same error on 2.1 , update to latest 2.4 , it solved .
> copy-dependencies fails with "Error copying artifact from .../target/classes
> to .../classes"
> --------------------------------------------------------------------------------------------
>
> Key: MDEP-259
> URL: https://jira.codehaus.org/browse/MDEP-259
> Project: Maven 2.x Dependency Plugin
> Issue Type: Bug
> Components: copy-dependencies
> Affects Versions: 2.0, 2.1
> Environment: Maven 2.0.9
> maven-dependency-plugin 2.0, 2.1 or 2.2-SNAPSHOT (r922616)
> Reporter: Andreas Veithen
> Assignee: Brian Fox
> Attachments: patch.txt, test-project.zip
>
>
> Scenario:
> * dependency:copy-dependencies is used to copy a dependency artifact that is
> part of the same multi-module build.
> * The compile phase is executed, but not the package phase.
> An example of this scenario is using maven-eclipse-plugin to import a Maven
> project with generated test (re)sources. In this case, one would execute "mvn
> generate-test-resources eclipse:eclipse" to make sure that the generated
> (re)sources are imported into the workspace (by default, maven-eclipse-plugin
> executes generate-sources and generate-resources, but not
> generate-test-sources and generate-test-resources).
> Result: The build fails with the following error:
> [INFO] [dependency:copy-dependencies {execution: default}]
> [INFO] Copying classes to
> /Users/veithen/dev/maven/axis/axis2/modules/fastinfoset/target/repo/modules/classes
> [INFO]
> ------------------------------------------------------------------------
> [ERROR] BUILD ERROR
> [INFO]
> ------------------------------------------------------------------------
> [INFO] Error copying artifact from
> /Users/veithen/dev/maven/axis/axis2/modules/addressing/target/classes to
> /Users/veithen/dev/maven/axis/axis2/modules/fastinfoset/target/repo/modules/classes
> Embedded error:
> /Users/veithen/dev/maven/axis/axis2/modules/addressing/target/classes (No
> such file or directory)
> Steps to reproduce:
> * Unpack the attached test project and build the entire project once with
> "mvn install".
> * Execute "mvn generate-resources" from the root project -> success (because
> the compile phase is not executed)
> * Execute "mvn package" from the root project -> success (because the package
> phase is executed)
> * Execute "mvn generate-test-resources" from the root project -> fails
> (because the compile phase is executed, but not the package phase)
> * Execute "mvn generate-test-resources" in project2 -> success (because the
> dependency is not part of the same build)
> Root cause analysis: In the scenario described above (compile phase executed,
> package phase not executed), Artifact#getFile() points to the target/classes
> directory instead of the output artifact. dependency:copy-dependencies
> doesn't detect this situation and blindly attempts to execute the copy
> operation. This fails with the error message shown above. Note that even if
> the operation didn't fail, it would produce an unexpected result.
> Proposed fix (see attached patch): Change maven-dependency-plugin to detect
> this situation and let it replace the original Artifact object by a new one
> resolved from the repository (which would then refer to the artifact
> generated by a previous build, exactly as in the mvn generate-resources case).
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