diff --git a/src/main/java/com/inteligr8/wildfly/maven/IndexingDependencyGraphTransformer.java b/src/main/java/com/inteligr8/wildfly/maven/IndexingDependencyGraphTransformer.java
index c82e763..4c1d320 100644
--- a/src/main/java/com/inteligr8/wildfly/maven/IndexingDependencyGraphTransformer.java
+++ b/src/main/java/com/inteligr8/wildfly/maven/IndexingDependencyGraphTransformer.java
@@ -16,21 +16,21 @@ package com.inteligr8.wildfly.maven;
 
 import java.util.Collections;
 import java.util.List;
-import java.util.Set;
 import java.util.Stack;
 
 import org.apache.maven.artifact.Artifact;
+import org.apache.maven.artifact.DefaultArtifact;
+import org.apache.maven.artifact.handler.DefaultArtifactHandler;
+import org.apache.maven.artifact.resolver.filter.ExclusionArtifactFilter;
+import org.apache.maven.model.Exclusion;
 import org.apache.maven.model.building.ModelBuildingException;
 import org.apache.maven.model.resolution.UnresolvableModelException;
 import org.eclipse.aether.RepositoryException;
-import org.eclipse.aether.artifact.DefaultArtifact;
 import org.eclipse.aether.collection.DependencyGraphTransformationContext;
 import org.eclipse.aether.collection.DependencyGraphTransformer;
 import org.eclipse.aether.graph.DependencyFilter;
 import org.eclipse.aether.graph.DependencyNode;
-import org.eclipse.aether.resolution.ArtifactRequest;
 import org.eclipse.aether.resolution.ArtifactResolutionException;
-import org.eclipse.aether.resolution.ArtifactResult;
 import org.eclipse.aether.util.artifact.JavaScopes;
 import org.eclipse.aether.util.filter.DependencyFilterUtils;
 import org.eclipse.aether.util.filter.ScopeDependencyFilter;
@@ -67,7 +67,7 @@ public class IndexingDependencyGraphTransformer implements DependencyGraphTransf
      */
     @Override
     public DependencyNode transformGraph(DependencyNode node, DependencyGraphTransformationContext context) throws RepositoryException {
-        this.crawl(node, new Stack<DependencyNode>());
+        this.crawl(node, new Stack<DependencyNode>(), new Stack<Exclusion>());
         
         return this.transfomer.transformGraph(node, context);
     }
@@ -78,16 +78,42 @@ public class IndexingDependencyGraphTransformer implements DependencyGraphTransf
      * @param node A dependency.
      * @param ancestors A stack of ancestral artifacts; parent on top; root on bottom; empty if root.
      */
-    private void crawl(DependencyNode node, Stack<DependencyNode> ancestors) {
+    private void crawl(DependencyNode node, Stack<DependencyNode> ancestors, Stack<Exclusion> exclusions) {
+        if (this.dac.getLog().isDebugEnabled())
+            this.dac.getLog().debug("Crawling: " + ancestors + ": " + node);
+        if (!new ExclusionArtifactFilter(exclusions).include(this.toMavenArtifact(node.getArtifact()))) {
+            if (this.dac.getLog().isDebugEnabled())
+                this.dac.getLog().debug("Excluding: " + node);
+            return;
+        }
+        
         if (!this.filter.accept(node, ancestors))
             return;
         
+        boolean doExclude = node.getDependency() != null && node.getDependency().getExclusions() != null && !node.getDependency().getExclusions().isEmpty();
+        int pushedExclusions = 0;
+        if (doExclude) {
+            if (this.dac.getLog().isDebugEnabled())
+                this.dac.getLog().debug("Will start excluding: " + node.getDependency().getExclusions());
+            for (org.eclipse.aether.graph.Exclusion exclusion : node.getDependency().getExclusions()) {
+                exclusions.push(this.toMavenExclusion(exclusion));
+                pushedExclusions++;
+            }
+        }
+        
         this.index(node, Collections.unmodifiableList(ancestors));
         
         ancestors.push(node);
         for (DependencyNode child : node.getChildren())
-            this.crawl(child, ancestors);
+            this.crawl(child, ancestors, exclusions);
         ancestors.pop();
+
+        if (doExclude) {
+            if (this.dac.getLog().isDebugEnabled())
+                this.dac.getLog().debug("Will stop excluding: " + node.getDependency().getExclusions());
+            for (int e = 0; e < pushedExclusions; e++)
+                exclusions.pop();
+        }
     }
     
     /**
@@ -121,17 +147,22 @@ public class IndexingDependencyGraphTransformer implements DependencyGraphTransf
             
             switch (type) {
                 case SystemModule:
-                case InSystemModule:
                     if (this.dac.getLog().isDebugEnabled())
                         this.dac.getLog().debug(nodeId + ": is in a module");
                     this.dindex.indexType(nodeId, DependencyType.InSystemModule);
                     return;
+                case InSystemModule:
+                    this.dac.getLog().debug(nodeId + ": is a dependency of something in a module, but not yet indexed (was excluded?)");
+                    //this.dindex.indexType(nodeId, DependencyType.InSystemModule);
+                    return;
                 case Module:
-                case InModule:
                     if (this.dac.getLog().isDebugEnabled())
                         this.dac.getLog().debug(nodeId + ": is in a module");
                     this.dindex.indexType(nodeId, DependencyType.InModule);
                     return;
+                case InModule:
+                    this.dac.getLog().debug(nodeId + ": is a dependency of something in a module, but not yet indexed (was excluded?)");
+                    return;
                 default:
                     // continue
             }
@@ -165,5 +196,19 @@ public class IndexingDependencyGraphTransformer implements DependencyGraphTransf
             this.dac.getLog().warn("Filtering out dependency '" + node.getDependency() + "' due to exception", e);
         }
     }
+    
+    private Artifact toMavenArtifact(org.eclipse.aether.artifact.Artifact aetherArtifact) {
+        Artifact artifact = new DefaultArtifact(aetherArtifact.getGroupId(), aetherArtifact.getArtifactId(), aetherArtifact.getVersion(), DefaultArtifact.SCOPE_COMPILE, aetherArtifact.getExtension(), aetherArtifact.getClassifier(), new DefaultArtifactHandler());
+        artifact.setGroupId(aetherArtifact.getGroupId());
+        artifact.setArtifactId(aetherArtifact.getArtifactId());
+        return artifact;
+    }
+    
+    private Exclusion toMavenExclusion(org.eclipse.aether.graph.Exclusion aetherExclusion) {
+        Exclusion exclusion = new Exclusion();
+        exclusion.setGroupId(aetherExclusion.getGroupId());
+        exclusion.setArtifactId(aetherExclusion.getArtifactId());
+        return exclusion;
+    }
 
 }
diff --git a/src/main/java/com/inteligr8/wildfly/maven/ValidationDependencyFilter.java b/src/main/java/com/inteligr8/wildfly/maven/ValidationDependencyFilter.java
index cb196ed..f9f1eb2 100644
--- a/src/main/java/com/inteligr8/wildfly/maven/ValidationDependencyFilter.java
+++ b/src/main/java/com/inteligr8/wildfly/maven/ValidationDependencyFilter.java
@@ -43,10 +43,14 @@ public class ValidationDependencyFilter implements DependencyFilter {
         
             DependencyType type = this.dindex.getType(parentId);
             if (type == null) {
-                switch (parent.getDependency().getScope()) {
-                    case "test":
-                        this.dac.getLog().debug("The dependency parent was excluded as a test artifact: " + parent);
-                    default:
+                if (parent.getDependency() == null) {
+                    this.dac.getLog().warn("Has no dependency information: " + parent.getArtifact() + " => " + node.getArtifact());
+                } else {
+                    switch (parent.getDependency().getScope()) {
+                        case "test":
+                            this.dac.getLog().debug("The dependency parent was excluded as a test artifact: " + parent);
+                        default:
+                    }
                 }
 
                 continue;