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java.lang.NullPointerException
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eSettingDelegate(BasicEObjectImpl.java:1565)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1027)
	at org.neclipse.xtext.example.smalljava.smallJavaDsl.impl.ClassTypeImpl.eGet(ClassTypeImpl.java:120)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1011)
	at org.eclipse.emf.ecore.impl.BasicEObjectImpl.eGet(BasicEObjectImpl.java:1003)
	at org.eclipse.emf.compare.utils.ReferenceUtil.safeEGet(ReferenceUtil.java:94)
	at org.eclipse.emf.compare.diff.DefaultDiffEngine.computeSingleValuedAttributeDifferences(DefaultDiffEngine.java:1024)
	at org.eclipse.emf.compare.diff.DefaultDiffEngine.computeDifferences(DefaultDiffEngine.java:575)
	at org.eclipse.emf.compare.diff.DefaultDiffEngine.checkForDifferences(DefaultDiffEngine.java:151)

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val resourceServiceProvider = IResourceServiceProvider.Registry.INSTANCE.getResourceServiceProvider(URI.createURI("dummy.mydsl"))
resourceServiceProvider.get(Injector).injectMembers(this)

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val resolver = new ClassloaderClasspathUriResolver()
val classpathURI = URI.createURI('''«ClasspathUriUtil.CLASSPATH_SCHEME»:/«packagePath»/«fileName»''')
val normalizedURI = resolver.resolve(this, classpathURI) /*resolver.resolve(null, classpathURI)*/
val resource = new ResourceSetImpl().getResource(normalizedUri.trimFragment(), true)
if (resource.diagnostic != Diagnostic.OK_INSTANCE) {
    throw new IllegalStateException("Problem parsing '" + uri + "':\n" +
          Joiner.on('\n').join(resource.getErrors()));
}
resource

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val resolver = new BundleClasspathUriResolver()
val classpathUri = URI.createURI('''«ClasspathUriUtil.CLASSPATH_SCHEME»:/models/yourmodel.xcore''')
val normalizedUri = resolver.resolve(Platform.getBundle("org.ne.emf.xcore.models"), classpathUri) /*resolver.resolve(null, classpathURI)*/
val resource = new ResourceSetImpl().getResource(normalizedUri.trimFragment(), true)
if (resource.diagnostic != Diagnostic.OK_INSTANCE) {
    throw new IllegalStateException("Problem parsing '" + uri + "':\n" +
          Joiner.on('\n').join(resource.getErrors()));
}
resource

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/*TIP : Getting handle of services across DSL's using IGlobalServiceProvider*/

// DSL Project
@Inject private IGlobalServiceProvider globalServiceProvider

val myLanguageIndex = globalServiceProvider.findService(URI.createURI("dummy.mylang"), MyLanguageIndex)
val myAnotherLanguageIndex = globalServiceProvider.findService(URI.createURI("dummy.anotherlang"), MyAnotherLanguageIndex)

// Non-DSL Project
val registry = IResourceServiceProvider.Registry.INSTANCE;

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public class MyDslDocumentProvider extends XtextDocumentProvider {
	@Override
	protected void doSaveDocument(IProgressMonitor monitor, Object element, IDocument document, boolean overwrite)
			throws CoreException {
		try {
		  final IHandlerService service = (IHandlerService) PlatformUI.getWorkbench().getService(IHandlerService.class);
			service.executeCommand("org.eclipse.xtext.ui.FormatAction", null);
		} catch (Exception e) {
			e.printStackTrace();
		}

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final XtextResourceSet xtextResourceSet = ...
final ResourceDescriptionsData resourceDescriptionsData = ResourceDescriptionsData.ResourceSetAdapter.findResourceDescriptionsData(xtextResourceSet);
if (resourceDescriptionsData != null) {
  //resourceDescriptionsData.getAllResourceDescriptions()
  //resourceDescriptionsData.getResourceDescription(uri)
  //resourceDescriptionsData.getExportedObjectsByType(type)
}

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boolean deliver = resourceSet.eDeliver();
try {
  //  Disable notification delivery to the adapters
  resourceSet.eSetDeliver(false);
  // Make change to the resource set
  resourceSet.getResources().clear();
} finally {
  // Reset the deliver flag to its previous state  
  resourceSet.eSetDeliver(deliver);
}

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// Get the URI to the resource
final URI uri = resource.getURI();
// Get the resource resolved by the URI. Do not load the resource, only get one if exists
final Resource r = resourceSet.getResource(uri, false);
if (r != null) {
  // Add the resource to the resourceset
  resourceSet.getResources().add(resource);
}

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eClass.getEPackage().getEFactoryInstance().create(eClass);