[MNG-3265] - maven-model Extension.equals causes NPE when any field is uninitialized
[MNG-3506] - Custom ArtifactHandler not resolved for project when an additional plugin with extensions is defined in parent pom
[MNG-3753] - ArtifactResolverDiagnoser.diagnose() fails with NPE if nested IOException has no detail message
[MNG-4189] - Maven not picking up specific timestamped version dependency when a later timestamped version was downloaded and already present in the local repository
[MNG-4218] - NPE in AbstractArtifactResolutionException if DefaultArtifactResolver.resolveTransitively is interrupted
[MNG-4228] - [regression] Authorization failed: Not authorized by proxy.
[MNG-4235] - [regression] Maven 2.2.0 produces invalid checksums during deployment to secured HTTP repo
[MNG-4236] - [regression] http wagon uploads files twice with Maven 2.2.0 when preemptive auth is disabled (default setting)
[MNG-4238] - Custom ArtifactHandler provided by build extension isn't used for project artifact
[MNG-4240] - Direct dependencies with scope == provided will not have their transitive dependencies resolved for compiling and testing
[MNG-4270] - ArtifactHandler, LifecycleMapping from plugin dependency is not used when plugin extensions are enabled
[MNG-4275] - [regression] Direct relocations no longer log at WARNING level : MNG-3380 conflicts with MNG-1689
Improvement
[MNG-4254] - Support selection of wagon implementation for a particular protocol
[MNG-4279] - wagon provider selection should fail gracefully and use protocol for roleHint if protocol-provider roleHint isn't available.
Task
[MNG-4290] - Update guide-http-settings to reflect the fact that sun-based http has been restored as the default for the http/s wagons.