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diff --git a/org.argeo.slc.repo/src/org/eclipse/aether/collection/UnsolvableVersionConflictException.java b/org.argeo.slc.repo/src/org/eclipse/aether/collection/UnsolvableVersionConflictException.java
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+++ b/org.argeo.slc.repo/src/org/eclipse/aether/collection/UnsolvableVersionConflictException.java
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+/*******************************************************************************
+ * Copyright (c) 2010, 2014 Sonatype, Inc.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *    Sonatype, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.aether.collection;
+
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.LinkedHashSet;
+import java.util.List;
+
+import org.eclipse.aether.RepositoryException;
+import org.eclipse.aether.artifact.Artifact;
+import org.eclipse.aether.graph.DependencyNode;
+import org.eclipse.aether.version.VersionConstraint;
+
+/**
+ * Thrown in case of an unsolvable conflict between different version constraints for a dependency.
+ */
+public class UnsolvableVersionConflictException
+    extends RepositoryException
+{
+
+    private final transient Collection<String> versions;
+
+    private final transient Collection<? extends List<? extends DependencyNode>> paths;
+
+    /**
+     * Creates a new exception with the specified paths to conflicting nodes in the dependency graph.
+     * 
+     * @param paths The paths to the dependency nodes that participate in the version conflict, may be {@code null}.
+     */
+    public UnsolvableVersionConflictException( Collection<? extends List<? extends DependencyNode>> paths )
+    {
+        super( "Could not resolve version conflict among " + toPaths( paths ) );
+        if ( paths == null )
+        {
+            this.paths = Collections.emptyList();
+            this.versions = Collections.emptyList();
+        }
+        else
+        {
+            this.paths = paths;
+            this.versions = new LinkedHashSet<String>();
+            for ( List<? extends DependencyNode> path : paths )
+            {
+                VersionConstraint constraint = path.get( path.size() - 1 ).getVersionConstraint();
+                if ( constraint != null && constraint.getRange() != null )
+                {
+                    versions.add( constraint.toString() );
+                }
+            }
+        }
+    }
+
+    private static String toPaths( Collection<? extends List<? extends DependencyNode>> paths )
+    {
+        String result = "";
+
+        if ( paths != null )
+        {
+            Collection<String> strings = new LinkedHashSet<String>();
+
+            for ( List<? extends DependencyNode> path : paths )
+            {
+                strings.add( toPath( path ) );
+            }
+
+            result = strings.toString();
+        }
+
+        return result;
+    }
+
+    private static String toPath( List<? extends DependencyNode> path )
+    {
+        StringBuilder buffer = new StringBuilder( 256 );
+
+        for ( Iterator<? extends DependencyNode> it = path.iterator(); it.hasNext(); )
+        {
+            DependencyNode node = it.next();
+            if ( node.getDependency() == null )
+            {
+                continue;
+            }
+
+            Artifact artifact = node.getDependency().getArtifact();
+            buffer.append( artifact.getGroupId() );
+            buffer.append( ':' ).append( artifact.getArtifactId() );
+            buffer.append( ':' ).append( artifact.getExtension() );
+            if ( artifact.getClassifier().length() > 0 )
+            {
+                buffer.append( ':' ).append( artifact.getClassifier() );
+            }
+            buffer.append( ':' ).append( node.getVersionConstraint() );
+
+            if ( it.hasNext() )
+            {
+                buffer.append( " -> " );
+            }
+        }
+
+        return buffer.toString();
+    }
+
+    /**
+     * Gets the paths leading to the conflicting dependencies.
+     * 
+     * @return The (read-only) paths leading to the conflicting dependencies, never {@code null}.
+     */
+    public Collection<? extends List<? extends DependencyNode>> getPaths()
+    {
+        return paths;
+    }
+
+    /**
+     * Gets the conflicting version constraints of the dependency.
+     * 
+     * @return The (read-only) conflicting version constraints, never {@code null}.
+     */
+    public Collection<String> getVersions()
+    {
+        return versions;
+    }
+
+}