Github user jdillon commented on the issue:
https://github.com/apache/maven/pull/116
the plexus @Requirement injection is probably why this works at all in
Maven, though w/o using maven-resolver-provider in a pure guice/sisu
environment, this fails and causes NPE:
```
java.lang.NullPointerException
at
org.apache.maven.repository.internal.DefaultModelResolver.resolveModel
(DefaultModelResolver.java:198)
at
org.apache.maven.model.building.DefaultModelBuilder.readParentExternally
(DefaultModelBuilder.java:1051)
at org.apache.maven.model.building.DefaultModelBuilder.readParent
(DefaultModelBuilder.java:829)
at org.apache.maven.model.building.DefaultModelBuilder.build
(DefaultModelBuilder.java:331)
at
org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.loadPom
(DefaultArtifactDescriptorReader.java:321)
at
org.apache.maven.repository.internal.DefaultArtifactDescriptorReader.readArtifactDescriptor
(DefaultArtifactDescriptorReader.java:199)
at
org.eclipse.aether.internal.impl.DefaultDependencyCollector.resolveCachedArtifactDescriptor
(DefaultDependencyCollector.java:544)
at
org.eclipse.aether.internal.impl.DefaultDependencyCollector.getArtifactDescriptorResult
(DefaultDependencyCollector.java:528)
at
org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency
(DefaultDependencyCollector.java:418)
at
org.eclipse.aether.internal.impl.DefaultDependencyCollector.processDependency
(DefaultDependencyCollector.java:372)
at org.eclipse.aether.internal.impl.DefaultDependencyCollector.process
(DefaultDependencyCollector.java:360)
at
org.eclipse.aether.internal.impl.DefaultDependencyCollector.collectDependencies
(DefaultDependencyCollector.java:263)
at
org.eclipse.aether.internal.impl.DefaultRepositorySystem.collectDependencies
(DefaultRepositorySystem.java:325)
...
```
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