diff --git a/maven-core/src/main/java/org/apache/maven/project/ReactorModelCache.java b/maven-core/src/main/java/org/apache/maven/project/ReactorModelCache.java
index e958980c1d7..67695d9273a 100644
--- a/maven-core/src/main/java/org/apache/maven/project/ReactorModelCache.java
+++ b/maven-core/src/main/java/org/apache/maven/project/ReactorModelCache.java
@@ -22,10 +22,8 @@
 import org.apache.maven.building.Source;
 import org.apache.maven.model.building.ModelCache;
 
-import java.util.HashSet;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Set;
 import java.util.concurrent.ConcurrentHashMap;
 
 /**
@@ -39,8 +37,6 @@ class ReactorModelCache
 
     private final Map<Object, Object> models = new ConcurrentHashMap<>( 256 );
     
-    private final Map<GACacheKey, Set<Source>> mappedSources = new ConcurrentHashMap<>( 64 );
-
     @Override
     public Object get( String groupId, String artifactId, String version, String tag )
     {
@@ -52,30 +48,6 @@ public void put( String groupId, String artifactId, String version, String tag,
     {
         models.put( new GavCacheKey( groupId, artifactId, version, tag ), data );
     }
-    
-    @Override
-    public Source get( String groupId, String artifactId )
-    {
-        Set<Source> sources = mappedSources.get( new GACacheKey( groupId, artifactId ) );
-        if ( sources == null )
-        {
-            return null;
-        }
-        else 
-        {
-            return sources.stream().reduce( ( a, b ) -> 
-            {
-                throw new IllegalStateException( "No unique Source for " + groupId + ':' + artifactId 
-                      + ": " + a.getLocation() + " and " + b.getLocation() );
-            } ).orElse( null );
-        }
-    }
-    
-    @Override
-    public void put( String groupId, String artifactId, Source source )
-    {
-        mappedSources.computeIfAbsent( new GACacheKey( groupId, artifactId ), k -> new HashSet<>() ).add( source );
-    }
 
     @Override
     public Object get( Source source, String tag )
diff --git a/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java b/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
index b8960e59120..f9ca3a40ad0 100644
--- a/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
+++ b/maven-model-builder/src/main/java/org/apache/maven/model/building/DefaultModelBuilder.java
@@ -31,12 +31,15 @@
 import java.util.Collection;
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Iterator;
 import java.util.LinkedHashSet;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Properties;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
 
 import javax.inject.Inject;
 import javax.inject.Named;
@@ -696,7 +699,12 @@ private Model readFileModel( ModelBuildingRequest request,
         intoCache( request.getModelCache(), modelSource, ModelCacheTag.FILE, model );
         if ( modelSource instanceof FileModelSource )
         {
-            intoCache( request.getModelCache(), getGroupId( model ), model.getArtifactId(), modelSource );
+            if ( request.getTransformerContextBuilder() instanceof DefaultTransformerContextBuilder )
+            {
+                DefaultTransformerContextBuilder contextBuilder =
+                        (DefaultTransformerContextBuilder) request.getTransformerContextBuilder();
+                contextBuilder.putSource( getGroupId( model ), model.getArtifactId(), modelSource );
+            }
         }
 
         return model;
@@ -1543,14 +1551,6 @@ private <T> void intoCache( ModelCache modelCache, String groupId, String artifa
         }
     }
 
-    private <T> void intoCache( ModelCache modelCache, String groupId, String artifactId, Source source )
-     {
-         if ( modelCache != null )
-         {
-             modelCache.put( groupId, artifactId, source );
-         }
-     }
-
     private <T> void intoCache( ModelCache modelCache, Source source, ModelCacheTag<T> tag, T data )
     {
         if ( modelCache != null )
@@ -1572,16 +1572,6 @@ private static <T> T fromCache( ModelCache modelCache, String groupId, String ar
         }
         return null;
     }
-    
-    private static Source fromCache( ModelCache modelCache, String groupId, String artifactId )
-    {
-        if ( modelCache != null )
-        {
-            return modelCache.get( groupId, artifactId );
-        }
-        return null;
-    }
-
 
     private static <T> T fromCache( ModelCache modelCache, Source source, ModelCacheTag<T> tag )
     {
@@ -1808,12 +1798,15 @@ protected void mergePluginContainer_Plugins( PluginContainer target, PluginConta
     private class DefaultTransformerContextBuilder implements TransformerContextBuilder
     {
         private final DefaultTransformerContext context = new DefaultTransformerContext();
-        
+
+        private final Map<DefaultTransformerContext.GAKey, Set<Source>> mappedSources
+                = new ConcurrentHashMap<>( 64 );
+
         /**
          * If an interface could be extracted, DefaultModelProblemCollector should be ModelProblemCollectorExt
          * 
          * @param request
-         * @param problems
+         * @param collector
          * @return
          */
         @Override
@@ -1845,7 +1838,7 @@ public Model getRawModel( Path path )
 
                 private Model findRawModel( String groupId, String artifactId )
                 {
-                    Source source = fromCache( request.getModelCache(), groupId, artifactId );
+                    Source source = getSource( groupId, artifactId );
                     if ( source != null )
                     {
                         try
@@ -1897,6 +1890,27 @@ private Model findRawModel( Path p )
         public TransformerContext build()
         {
             return context;
-        }        
+        }
+
+        public Source getSource( String groupId, String artifactId )
+        {
+            Set<Source> sources = mappedSources.get( new DefaultTransformerContext.GAKey( groupId, artifactId ) );
+            if ( sources == null )
+            {
+                return null;
+            }
+            return sources.stream().reduce( ( a, b ) ->
+            {
+                throw new IllegalStateException( "No unique Source for " + groupId + ':' + artifactId
+                        + ": " + a.getLocation() + " and " + b.getLocation() );
+            } ).orElse( null );
+        }
+
+        public void putSource( String groupId, String artifactId, Source source )
+        {
+            mappedSources.computeIfAbsent( new DefaultTransformerContext.GAKey( groupId, artifactId ),
+                    k -> new HashSet<>() ).add( source );
+        }
+
     }
 }
diff --git a/maven-model-builder/src/main/java/org/apache/maven/model/building/ModelCache.java b/maven-model-builder/src/main/java/org/apache/maven/model/building/ModelCache.java
index 963b0ea6cb0..952ef46806d 100644
--- a/maven-model-builder/src/main/java/org/apache/maven/model/building/ModelCache.java
+++ b/maven-model-builder/src/main/java/org/apache/maven/model/building/ModelCache.java
@@ -59,30 +59,6 @@ default Object get( Source path, String tag )
         // only useful for ReactorModelCache
         return null;
     }
-    
-    /**
-     * 
-     * @param groupId The groupId, must not be {@code null}.
-     * @param artifactId The artifactId, must not be {@code null}.
-     * @param source the source matching
-     * @throws IllegalArgumentException if the groupId + artifactId was already added before
-     */
-    default void put( String groupId, String artifactId, Source source )
-    {
-     // only useful for ReactorModelCache
-    }
-
-    /**
-     * 
-     * @param groupId The groupId, must not be {@code null}.
-     * @param artifactId The artifactId, must not be {@code null}.
-     * @return The requested source or {@code null} if none was present in the cache.
-     */
-    default Source get( String groupId, String artifactId )
-    {
-        // only useful for ReactorModelCache
-        return null;
-    }
 
     /**
      * Puts the specified data into the cache.