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https://issues.apache.org/jira/browse/MNG-5980?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16997408#comment-16997408
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Michael Osipov commented on MNG-5980:
-------------------------------------
I think there are several issues here:
* Our documentation is not good, agreed.
* At current state our dependency resolution mechanism is order-dependent
* **But** classpaths are not order-dependent, Mark Thomas would competely
disagree. Consider that {{java -cp '*.jar'}} would produce different results.
There were several tickets against Tomcat where people relied of classpath
order and Mark Thomas closed them for good reasons because the application is
broken and relies on ordering.
> DependencyGraphBuilder gives different results depending on the order of
> dependencies in the pom
> ------------------------------------------------------------------------------------------------
>
> Key: MNG-5980
> URL: https://issues.apache.org/jira/browse/MNG-5980
> Project: Maven
> Issue Type: Bug
> Components: Dependencies, Plugin API
> Environment: Kubuntu 14.10
> Java 8
> Maven 3.0.5/3.3.9
> maven-dependency-tree 2.1/3.0
> Reporter: Gerrit Daniels
> Priority: Major
> Attachments: dependency-graph-builder-bug.zip
>
>
> I'm getting different results when using DependencyGraphBuilder in a plugin
> depending on the order in which the dependencies are defined in the pom of
> the project the plugin is running on. I have created some test projects to
> reproduce the bug.
> - actual-dependency: This is the dependency that moves when changing the
> order in the pom.
> - test-dependency: Depends on the actual-dependency with compile scope.
> - compile-dependency: Also depends on the actual-dependency with compile
> scope.
> - main-project: Depends on the test-dependency with test scope and on the
> compile-dependency with compile scope. Has the plugin configured.
> - plugin: Builds the dependency graph.
> When running maven with the -X switch on the main project with the
> test-dependency declared first in the pom I get the following dependency
> graph:
> {code}
> [DEBUG] com.qmino:main-project:jar:1.0-SNAPSHOT
> [DEBUG] com.qmino:test-dependency:jar:1.0-SNAPSHOT:test
> [DEBUG] com.qmino:actual-dependency:jar:1.0-SNAPSHOT:compile
> [DEBUG] com.qmino:compile-dependency:jar:1.0-SNAPSHOT:compile
> {code}
> When I change the order of the dependencies I get:
> {code}
> [DEBUG] com.qmino:main-project:jar:1.0-SNAPSHOT
> [DEBUG] com.qmino:compile-dependency:jar:1.0-SNAPSHOT:compile
> [DEBUG] com.qmino:actual-dependency:jar:1.0-SNAPSHOT:compile
> [DEBUG] com.qmino:test-dependency:jar:1.0-SNAPSHOT:test
> {code}
> It seems to me that the order of the dependencies shouldn't change the
> results. In both cases I would expect the second output, since the compile
> scope should overrule the test scope.
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