getReferencingResourceURIs():

 - Ignore directories when trying to find sidecar model files
 - Suppress console message in case a package in a model file could not be found

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/ResourceUtils.java

@@ -34,6 +34,7 @@ import java.util.stream.Collectors;
 
 import org.eclipse.core.resources.IContainer;
 import org.eclipse.core.resources.IFile;
+import org.eclipse.core.resources.IFolder;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.resources.IWorkspaceRoot;
 import org.eclipse.core.resources.ResourcesPlugin;
@@ -48,6 +49,7 @@ import org.eclipse.emf.ecore.resource.ResourceSet;
 import org.eclipse.emf.ecore.resource.impl.ResourceFactoryImpl;
 import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
 import org.eclipse.emf.ecore.util.EcoreUtil;
+import org.eclipse.emf.ecore.xmi.PackageNotFoundException;
 import org.eclipse.emf.ecore.xmi.impl.XMIResourceImpl;
 import org.eclipse.emf.ecore.xmi.impl.XMLResourceFactoryImpl;
 import org.eclipse.emf.ecore.xml.type.AnyType;
@@ -62,7 +64,7 @@ import org.fortiss.tooling.kernel.service.IPersistencyService;
  * @author mou
  * @author $Author$
  * @version $Rev$
- * @ConQAT.Rating YELLOW Hash: A14278605586372E3CCEE85B91CF34CD
+ * @ConQAT.Rating YELLOW Hash: E6CBD4C9FC74A32B1386D76FC50D4CD1
  */
 public final class ResourceUtils {
 
@@ -394,7 +396,7 @@ public final class ResourceUtils {
 			}
 
 			for(IResource member : members) {
-				if(member.equals(file)) {
+				if(member.equals(file) || member instanceof IFolder) {
 					continue;
 				}
 
@@ -415,8 +417,10 @@ public final class ResourceUtils {
 
 					siblingResource.unload();
 				} catch(Exception e) {
-					error(ToolingKernelActivator.getDefault(),
-							"Failed to load \"" + member.getName(), e);
+					if(!(e.getCause() instanceof PackageNotFoundException)) {
+						error(ToolingKernelActivator.getDefault(),
+								"Failed to load \"" + member.getName(), e);
+					}
 				}
 
 				if(progressMonitor != null) {