[MNG-2227] Can't use repositories in protocols other than http

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Incomplete
• Affects Version/s: 2.0.4
• Component/s: Artifacts and Repositories
• Assignee: Unassigned
• Reporter: Carlos Sanchez Gonzalez
• Created: 13/Apr/06 20:15
• Updated: 06/Apr/15 01:53
• Resolved: 22/Jan/14 20:31

Description

When adding the wagon-scm to the build extensions to add another scm based repo (not to replace the http one) Maven fails because tries to validate the scm repo before downloading the wagon-scm jar from the http repo.

<build>
<extensions>
<extension>
<groupId>org.apache.maven.wagon</groupId>
<artifactId>wagon-scm</artifactId>
<version>1.0-alpha-7-SNAPSHOT</version>
</extension>
</extensions>
</build>

[WARNING] repository metadata for: 'snapshot org.apache.maven.wagon:wagon-scm:1.0-alpha-7-SNAPSHOT' could not be retrieved from repository: acme due to an error: Unsupported Protocol: 'scm': Cannot find wagon which supports the requested protocol: scm
[INFO] Repository 'acme' will be blacklisted
[DEBUG] Exception
org.apache.maven.wagon.TransferFailedException: Unsupported Protocol: 'scm': Cannot find wagon which supports the requested protocol: scm
at org.apache.maven.artifact.manager.DefaultWagonManager.getRemoteFile(DefaultWagonManager.java:325)
at org.apache.maven.artifact.manager.DefaultWagonManager.getArtifactMetadata(DefaultWagonManager.java:295)
at org.apache.maven.artifact.repository.metadata.DefaultRepositoryMetadataManager.resolveAlways(DefaultRepositoryMetadataManager.java:356)
at org.apache.maven.artifact.repository.metadata.DefaultRepositoryMetadataManager.resolve(DefaultRepositoryMetadataManager.java:91)
at org.apache.maven.artifact.transform.AbstractVersionTransformation.resolveVersion(AbstractVersionTransformation.java:62)
at org.apache.maven.artifact.transform.SnapshotTransformation.transformForResolve(SnapshotTransformation.java:60)
at org.apache.maven.artifact.transform.DefaultArtifactTransformationManager.transformForResolve(DefaultArtifactTransformationManager.java:40)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:104)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:63)
at org.apache.maven.project.DefaultMavenProjectBuilder.findModelFromRepository(DefaultMavenProjectBuilder.java:467)
at org.apache.maven.project.DefaultMavenProjectBuilder.buildFromRepository(DefaultMavenProjectBuilder.java:225)
at org.apache.maven.project.artifact.MavenMetadataSource.retrieve(MavenMetadataSource.java:102)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.recurse(DefaultArtifactCollector.java:275)
at org.apache.maven.artifact.resolver.DefaultArtifactCollector.collect(DefaultArtifactCollector.java:67)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:223)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:211)
at org.apache.maven.artifact.resolver.DefaultArtifactResolver.resolveTransitively(DefaultArtifactResolver.java:182)
at org.apache.maven.extension.DefaultExtensionManager.addExtension(DefaultExtensionManager.java:68)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.findExtensions(DefaultLifecycleExecutor.java:155)
at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:138)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:322)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:115)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:256)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.codehaus.classworlds.Launcher.launchEnhanced(Launcher.java:315)
at org.codehaus.classworlds.Launcher.launch(Launcher.java:255)
at org.codehaus.classworlds.Launcher.mainWithExitCode(Launcher.java:430)
at org.codehaus.classworlds.Launcher.main(Launcher.java:375)
Caused by: org.apache.maven.wagon.UnsupportedProtocolException: Cannot find wagon which supports the requested protocol: scm
at org.apache.maven.artifact.manager.DefaultWagonManager.getWagon(DefaultWagonManager.java:99)
at org.apache.maven.artifact.manager.DefaultWagonManager.getRemoteFile(DefaultWagonManager.java:319)
... 30 more
Caused by: org.codehaus.plexus.component.repository.exception.ComponentLookupException: Component descriptor cannot be found in the component repository: org.apache.maven.wagon.Wagonscm.
at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:323)
at org.codehaus.plexus.DefaultPlexusContainer.lookup(DefaultPlexusContainer.java:440)
at org.apache.maven.artifact.manager.DefaultWagonManager.getWagon(DefaultWagonManager.java:94)
... 31 more

Issue Links

• is duplicated by: WAGON-137 Unsupported Protocol: 'ftp': Cannot find wagon which supports the requested protocol: ftp
• is duplicated by: MNG-2195 FTP download is not supported directly by Maven
• relates to: MNG-2225 Classloader problem when adding jars to M2_HOME
• relates to: MNG-657 possible chicken and egg problem with extensions