Tomo Suzuki created MNG-6732:
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Summary: DefaultArtifactDescriptorReader to check IGNORE_MISSING
policy upon ArtifactTransferException
Key: MNG-6732
URL: https://issues.apache.org/jira/browse/MNG-6732
Project: Maven
Issue Type: Improvement
Components: core
Affects Versions: 3.6.1
Reporter: Tomo Suzuki
Attachments: 62884438-89260580-bd04-11e9-8c4a-897d4b736dc7.png
h1. Problem
Sometimes my Maven enforcer rule does not receive resolved artifact list
because of missing artifact even when the missing artifact does not appear in
the final dependency graph.
h1.
h1. Background
Artifact xerces:xerces-impl:2.6.2 is not published in Maven Central.
My enforcer rule can retrieve artifact list when applied to
[https://github.com/suztomo/spring-cloud-gcp/tree/v1.1.2-linkage-checker]
project even though it outputs "[WARNING] The POM for
xerces:xerces-impl:jar:2.6.2 is missing, no dependency information available".
On the other hand, the enforcer rule fails to retrieve artifact list when
applied to
[grpc-java-by-example/chat-example/chat-vaadin-client|https://github.com/saturnism/grpc-java-by-example/tree/master/chat-example/chat-vaadin-client]
because of the missing xerces:xerces-impl:2.6.2.
[https://github.com/GoogleCloudPlatform/cloud-opensource-java/issues/834]
h1. Diagnosis
Currently DefaultArtifactDescriptorReader.loadPom method checks
"ArtifactDescriptorPolicy.IGNORE_MISSING" policy upon
ArtifactNotFoundException. This allows
DefaultProjectDependenciesResolver.resolve calls repoSystem.resolveDependencies
to obtain partially resolved artifact list even when there is a missing
artifact (such as xerces:xerces-impl:2.6.2)
However, when there is a retired Maven repository is involved (such as
[http://repository.codehaus.org/] ), DefaultArtifactDescriptorReader.loadPom
method throws ArtifactDescriptorException without checking
"ArtifactDescriptorPolicy.IGNORE_MISSING" policy, and thus
DefaultProjectDependenciesResolver.resolve does not return partially resolved
artifact list.
I will create example Maven projects to compare.
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