Out of the box I get the exception at the bottom of this issue. Removing the offending reference resolves the issue and compiles fine. I think you have a repository defined in your settings.xml. Not a big deal and easy to fix, but I thought I'd let you know in case you want your project to be immediately compilable by anyone.
[INFO] Error stacktraces are turned on.
[INFO] Scanning for projects...
[WARNING] The POM for org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT is missing, no dependency information available
[ERROR] The build could not read 1 project -> [Help 1]
org.apache.maven.project.ProjectBuildingException: Some problems were encountered while processing the POMs:
[ERROR] Unresolveable build extension: Plugin org.kathrynhuxtable.maven.wagon:wagon-gitsite:0.4-SNAPSHOT or one of its dependencies could not be resolved: Failure to find org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT in http://nexus.scala-tools.org/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of scala-tools.org has elapsed or updates are forced @
at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:339)
at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:632)
at org.apache.maven.DefaultMaven.getProjectsForMavenReactor(DefaultMaven.java:581)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:233)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
[ERROR]
[ERROR] The project uk.co.turingatemyhamster:graphviz-s:0.1-SNAPSHOT (/home/michael/hack/github/graphviz-s/pom.xml) has 1 error
[ERROR] Unresolveable build extension: Plugin org.kathrynhuxtable.maven.wagon:wagon-gitsite:0.4-SNAPSHOT or one of its dependencies could not be resolved: Failure to find org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT in http://nexus.scala-tools.org/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of scala-tools.org has elapsed or updates are forced -> [Help 2]
org.apache.maven.plugin.PluginResolutionException: Plugin org.kathrynhuxtable.maven.wagon:wagon-gitsite:0.4-SNAPSHOT or one of its dependencies could not be resolved: Failure to find org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT in http://nexus.scala-tools.org/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of scala-tools.org has elapsed or updates are forced
at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:215)
at org.apache.maven.project.DefaultProjectBuildingHelper.resolveExtensionArtifacts(DefaultProjectBuildingHelper.java:377)
at org.apache.maven.project.DefaultProjectBuildingHelper.createProjectRealm(DefaultProjectBuildingHelper.java:237)
at org.apache.maven.project.DefaultModelBuildingListener.buildExtensionsAssembled(DefaultModelBuildingListener.java:106)
at org.apache.maven.model.building.ModelBuildingEventCatapult$1.fire(ModelBuildingEventCatapult.java:43)
at org.apache.maven.model.building.DefaultModelBuilder.fireEvent(DefaultModelBuilder.java:1041)
at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:391)
at org.apache.maven.model.building.DefaultModelBuilder.build(DefaultModelBuilder.java:374)
at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:536)
at org.apache.maven.project.DefaultProjectBuilder.build(DefaultProjectBuilder.java:328)
at org.apache.maven.DefaultMaven.collectProjects(DefaultMaven.java:632)
at org.apache.maven.DefaultMaven.getProjectsForMavenReactor(DefaultMaven.java:581)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:233)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
Caused by: org.sonatype.aether.resolution.ArtifactResolutionException: Failure to find org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT in http://nexus.scala-tools.org/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of scala-tools.org has elapsed or updates are forced
at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:541)
at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolveArtifacts(DefaultArtifactResolver.java:220)
at org.sonatype.aether.impl.internal.DefaultRepositorySystem.resolveDependencies(DefaultRepositorySystem.java:395)
at org.apache.maven.plugin.internal.DefaultPluginDependenciesResolver.resolve(DefaultPluginDependenciesResolver.java:207)
... 24 more
Caused by: org.sonatype.aether.transfer.ArtifactNotFoundException: Failure to find org.kathrynhuxtable.maven.wagon:wagon-gitsite:jar:0.4-SNAPSHOT in http://nexus.scala-tools.org/content/repositories/releases was cached in the local repository, resolution will not be reattempted until the update interval of scala-tools.org has elapsed or updates are forced
at org.sonatype.aether.impl.internal.DefaultUpdateCheckManager.checkArtifact(DefaultUpdateCheckManager.java:190)
at org.sonatype.aether.impl.internal.DefaultArtifactResolver.resolve(DefaultArtifactResolver.java:430)
... 27 more
[ERROR]
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/ProjectBuildingException
[ERROR] [Help 2] http://cwiki.apache.org/confluence/display/MAVEN/PluginResolutionException
Out of the box I get the exception at the bottom of this issue. Removing the offending reference resolves the issue and compiles fine. I think you have a repository defined in your settings.xml. Not a big deal and easy to fix, but I thought I'd let you know in case you want your project to be immediately compilable by anyone.