=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/DefaultObjectBundleService.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/DefaultObjectBundleService.java	2016-02-04 08:01:30 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/DefaultObjectBundleService.java	2016-02-08 07:21:53 +0000
@@ -44,6 +44,12 @@
     }
 
     @Override
+    public void validate( ObjectBundle bundle )
+    {
+
+    }
+
+    @Override
     public void commit( ObjectBundle bundle )
     {
 

=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundle.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundle.java	2016-02-04 08:01:30 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundle.java	2016-02-08 07:21:53 +0000
@@ -28,9 +28,91 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+import org.hisp.dhis.common.IdentifiableObject;
+import org.hisp.dhis.preheat.Preheat;
+import org.hisp.dhis.preheat.PreheatIdentifier;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
 /**
  * @author Morten Olav Hansen <mortenoh@gmail.com>
  */
 public class ObjectBundle
 {
+    private ObjectBundleMode objectBundleMode = ObjectBundleMode.COMMIT;
+
+    private PreheatIdentifier preheatIdentifier = PreheatIdentifier.UID;
+
+    private Preheat preheat = new Preheat();
+
+    private Map<Class<? extends IdentifiableObject>, List<IdentifiableObject>> objects = new HashMap<>();
+
+    public ObjectBundle()
+    {
+    }
+
+    public ObjectBundleMode getObjectBundleMode()
+    {
+        return objectBundleMode;
+    }
+
+    public void setObjectBundleMode( ObjectBundleMode objectBundleMode )
+    {
+        this.objectBundleMode = objectBundleMode;
+    }
+
+    public PreheatIdentifier getPreheatIdentifier()
+    {
+        return preheatIdentifier;
+    }
+
+    public void setPreheatIdentifier( PreheatIdentifier preheatIdentifier )
+    {
+        this.preheatIdentifier = preheatIdentifier;
+    }
+
+    public Preheat getPreheat()
+    {
+        return preheat;
+    }
+
+    public void setPreheat( Preheat preheat )
+    {
+        this.preheat = preheat;
+    }
+
+    @SuppressWarnings( "unchecked" )
+    public <T extends IdentifiableObject> void addObject( T object )
+    {
+        if ( object == null )
+        {
+            return;
+        }
+
+        if ( !objects.containsKey( object.getClass() ) )
+        {
+            objects.put( object.getClass(), new ArrayList<>() );
+        }
+
+        objects.get( object.getClass() ).add( object );
+        preheat.put( preheatIdentifier, object );
+    }
+
+    public <T extends IdentifiableObject> void addObjects( List<T> objects )
+    {
+        objects.forEach( this::addObject );
+    }
+
+    public Map<Class<? extends IdentifiableObject>, List<IdentifiableObject>> getObjects()
+    {
+        return objects;
+    }
+
+    public void setObjects( Map<Class<? extends IdentifiableObject>, List<IdentifiableObject>> objects )
+    {
+        this.objects = objects;
+    }
 }

=== added file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleException.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleException.java	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleException.java	2016-02-08 07:21:53 +0000
@@ -0,0 +1,41 @@
+package org.hisp.dhis.dxf2.metadata2.objectbundle;
+
+/*
+ * Copyright (c) 2004-2016, University of Oslo
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * Neither the name of the HISP project nor the names of its contributors may
+ * be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * @author Morten Olav Hansen <mortenoh@gmail.com>
+ */
+public class ObjectBundleException
+    extends RuntimeException
+{
+    public ObjectBundleException( String message )
+    {
+        super( message );
+    }
+}

=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleParams.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleParams.java	2016-02-04 08:01:30 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleParams.java	2016-02-08 07:21:53 +0000
@@ -28,6 +28,8 @@
  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+import org.hisp.dhis.preheat.PreheatIdentifier;
+
 /**
  * @author Morten Olav Hansen <mortenoh@gmail.com>
  */
@@ -35,6 +37,8 @@
 {
     private ObjectBundleMode objectBundleMode;
 
+    private PreheatIdentifier preheatIdentifier;
+
     public ObjectBundleParams()
     {
     }
@@ -49,4 +53,15 @@
         this.objectBundleMode = objectBundleMode;
         return this;
     }
+
+    public PreheatIdentifier getPreheatIdentifier()
+    {
+        return preheatIdentifier;
+    }
+
+    public ObjectBundleParams setPreheatIdentifier( PreheatIdentifier preheatIdentifier )
+    {
+        this.preheatIdentifier = preheatIdentifier;
+        return this;
+    }
 }

=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleService.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleService.java	2016-02-04 08:01:30 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/main/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleService.java	2016-02-08 07:21:53 +0000
@@ -42,6 +42,13 @@
     ObjectBundle create( ObjectBundleParams params );
 
     /**
+     * Validate object bundle
+     *
+     * @param bundle Bundle to validate
+     */
+    void validate( ObjectBundle bundle );
+
+    /**
      * Commits objects from bundle into persistence store if bundle mode COMMIT is enabled.
      *
      * @param bundle ObjectBundle to commit.

=== modified file 'dhis-2/dhis-services/dhis-service-dxf2/src/test/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleServiceTest.java'
--- dhis-2/dhis-services/dhis-service-dxf2/src/test/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleServiceTest.java	2016-02-04 08:01:30 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/test/java/org/hisp/dhis/dxf2/metadata2/objectbundle/ObjectBundleServiceTest.java	2016-02-08 07:21:53 +0000
@@ -29,10 +29,14 @@
  */
 
 import org.hisp.dhis.DhisSpringTest;
+import org.hisp.dhis.dataelement.DataElementGroup;
+import org.hisp.dhis.preheat.PreheatIdentifier;
+import org.hisp.dhis.render.RenderService;
 import org.junit.Test;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
 
 /**
  * @author Morten Olav Hansen <mortenoh@gmail.com>
@@ -43,6 +47,15 @@
     @Autowired
     private ObjectBundleService objectBundleService;
 
+    @Autowired
+    private RenderService _renderService;
+
+    @Override
+    protected void setUpTest() throws Exception
+    {
+        renderService = _renderService;
+    }
+
     @Test
     public void testCreateObjectBundle()
     {
@@ -51,4 +64,17 @@
 
         assertNotNull( bundle );
     }
+
+    @Test
+    public void testObjectBundleShouldAddToObjectAndPreheat()
+    {
+        ObjectBundleParams params = new ObjectBundleParams();
+        ObjectBundle bundle = objectBundleService.create( params );
+
+        DataElementGroup dataElementGroup = fromJson( "dxf2/degAUidRef.json", DataElementGroup.class );
+        bundle.addObject( dataElementGroup );
+
+        assertTrue( bundle.getObjects().get( DataElementGroup.class ).contains( dataElementGroup ) );
+        assertTrue( bundle.getPreheat().containsKey( PreheatIdentifier.UID, DataElementGroup.class, dataElementGroup.getUid() ) );
+    }
 }
\ No newline at end of file

=== added file 'dhis-2/dhis-services/dhis-service-dxf2/src/test/resources/dxf2/degAUidRef.json'
--- dhis-2/dhis-services/dhis-service-dxf2/src/test/resources/dxf2/degAUidRef.json	1970-01-01 00:00:00 +0000
+++ dhis-2/dhis-services/dhis-service-dxf2/src/test/resources/dxf2/degAUidRef.json	2016-02-08 07:21:53 +0000
@@ -0,0 +1,17 @@
+{
+  "name": "DataElementGroupA",
+  "user": {
+    "id": "userabcdefA"
+  },
+  "dataElements": [
+    {
+      "id": "deabcdefghA"
+    },
+    {
+      "id": "deabcdefghB"
+    },
+    {
+      "id": "deabcdefghC"
+    }
+  ]
+}
\ No newline at end of file