http://www.jboss.org/shrinkwrap-resolver-parent/shrinkwrap-resolver-impl-maven: Implementation for Resolving Dependencies from a Maven Backend (JBoss by Red Hat) 
public class org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl extends org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemBaseImpl<org.jboss.shrinkwrap.resolver.api.maven.MavenResolverSystem, org.jboss.shrinkwrap.resolver.api.maven.ConfigurableMavenResolverSystem, org.jboss.shrinkwrap.resolver.api.maven.PomEquippedResolveStage, org.jboss.shrinkwrap.resolver.api.maven.PomlessResolveStage, org.jboss.shrinkwrap.resolver.api.maven.MavenStrategyStage, org.jboss.shrinkwrap.resolver.api.maven.MavenFormatStage> implements org.jboss.shrinkwrap.resolver.api.maven.MavenResolverSystem, org.jboss.shrinkwrap.resolver.impl.maven.MavenWorkingSessionContainer
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl
  super_class: org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemBaseImpl
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
         0: .line 43
            aload 0 /* this */
            new org.jboss.shrinkwrap.resolver.impl.maven.PomlessResolveStageImpl
            dup
            new org.jboss.shrinkwrap.resolver.impl.maven.MavenWorkingSessionImpl
            dup
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.MavenWorkingSessionImpl.<init>:()V
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.PomlessResolveStageImpl.<init>:(Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;)V
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl.<init>:(Lorg/jboss/shrinkwrap/resolver/api/maven/PomlessResolveStage;)V
         1: .line 44
            return
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/jboss/shrinkwrap/resolver/impl/maven/MavenResolverSystemImpl;
    Exceptions:
      throws java.lang.IllegalArgumentException

  public void <init>(org.jboss.shrinkwrap.resolver.api.maven.PomlessResolveStage);
    descriptor: (Lorg/jboss/shrinkwrap/resolver/api/maven/PomlessResolveStage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
        start local 1 // org.jboss.shrinkwrap.resolver.api.maven.PomlessResolveStage delegate
         0: .line 54
            aload 0 /* this */
            aload 1 /* delegate */
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemBaseImpl.<init>:(Lorg/jboss/shrinkwrap/resolver/api/maven/PomlessResolveStageBase;)V
         1: .line 55
            return
        end local 1 // org.jboss.shrinkwrap.resolver.api.maven.PomlessResolveStage delegate
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lorg/jboss/shrinkwrap/resolver/impl/maven/MavenResolverSystemImpl;
            0    2     1  delegate  Lorg/jboss/shrinkwrap/resolver/api/maven/PomlessResolveStage;
    Exceptions:
      throws java.lang.IllegalArgumentException
    MethodParameters:
          Name  Flags
      delegate  final

  public org.jboss.shrinkwrap.resolver.api.maven.MavenWorkingSession getMavenWorkingSession();
    descriptor: ()Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
         0: .line 64
            aload 0 /* this */
            invokespecial org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemBaseImpl.getSession:()Lorg/jboss/shrinkwrap/resolver/api/maven/MavenWorkingSession;
            areturn
        end local 0 // org.jboss.shrinkwrap.resolver.impl.maven.MavenResolverSystemImpl this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/jboss/shrinkwrap/resolver/impl/maven/MavenResolverSystemImpl;
}
Signature: Lorg/jboss/shrinkwrap/resolver/impl/maven/MavenResolverSystemBaseImpl<Lorg/jboss/shrinkwrap/resolver/api/maven/MavenResolverSystem;Lorg/jboss/shrinkwrap/resolver/api/maven/ConfigurableMavenResolverSystem;Lorg/jboss/shrinkwrap/resolver/api/maven/PomEquippedResolveStage;Lorg/jboss/shrinkwrap/resolver/api/maven/PomlessResolveStage;Lorg/jboss/shrinkwrap/resolver/api/maven/MavenStrategyStage;Lorg/jboss/shrinkwrap/resolver/api/maven/MavenFormatStage;>;Lorg/jboss/shrinkwrap/resolver/api/maven/MavenResolverSystem;Lorg/jboss/shrinkwrap/resolver/impl/maven/MavenWorkingSessionContainer;
SourceFile: "MavenResolverSystemImpl.java"