2 files changed, 17 insertions, 2 deletions
diff --git a/src/nativewindow/classes/jogamp/nativewindow/windows/GDIUtil.java b/src/nativewindow/classes/jogamp/nativewindow/windows/GDIUtil.java
index db61b1efd..38a5b5bc6 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/windows/GDIUtil.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/windows/GDIUtil.java
@@ -60,6 +60,9 @@ public class GDIUtil implements ToolkitProperties {
                         throw new NativeWindowException("GDI: Could not initialized native stub");
                     }
                     dummyWindowClassFactory = new RegisteredClassFactory(dummyWindowClassNameBase, getDummyWndProc0());
+                    if(DEBUG) {
+                        System.out.println("GDI.initSingleton() dummyWindowClassFactory "+dummyWindowClassFactory);
+                    }
                     isInit = true;
                 }
             }
@@ -91,6 +94,10 @@ public class GDIUtil implements ToolkitProperties {
     public static long CreateDummyWindow(int x, int y, int width, int height) {
         synchronized(dummyWindowSync) {
             dummyWindowClass = dummyWindowClassFactory.getSharedClass();
+            if(DEBUG) {
+                System.out.println("GDI.CreateDummyWindow() dummyWindowClassFactory "+dummyWindowClassFactory);
+                System.out.println("GDI.CreateDummyWindow() dummyWindowClass "+dummyWindowClass);
+            }
             return CreateDummyWindow0(dummyWindowClass.getHInstance(), dummyWindowClass.getName(), dummyWindowClass.getName(), x, y, width, height);
         }
     }
diff --git a/src/nativewindow/classes/jogamp/nativewindow/windows/RegisteredClassFactory.java b/src/nativewindow/classes/jogamp/nativewindow/windows/RegisteredClassFactory.java
index e033a9f66..19a48d3bf 100644
--- a/src/nativewindow/classes/jogamp/nativewindow/windows/RegisteredClassFactory.java
+++ b/src/nativewindow/classes/jogamp/nativewindow/windows/RegisteredClassFactory.java
@@ -29,7 +29,9 @@
 package jogamp.nativewindow.windows;
 
 import jogamp.nativewindow.Debug;
+
 import java.util.ArrayList;
+
 import javax.media.nativewindow.NativeWindowException;
 
 public class RegisteredClassFactory {
@@ -45,14 +47,20 @@ public class RegisteredClassFactory {
         registeredFactories = new ArrayList<RegisteredClassFactory>();
     }
 
-    private String classBaseName;
-    private long wndProc;
+    private final String classBaseName;
+    private final long wndProc;
 
     private RegisteredClass sharedClass = null;
     private int classIter = 0;
     private int sharedRefCount = 0;
     private final Object sync = new Object();
 
+    private String toHexString(long l) { return "0x"+Long.toHexString(l); }
+
+    @Override
+    public final String toString() { return "RegisteredClassFactory[moduleHandle "+toHexString(hInstance)+", "+classBaseName+
+            ", wndProc "+toHexString(wndProc)+", shared[refCount "+sharedRefCount+", class "+sharedClass+"]]"; }
+
     /**
      * Release the {@link RegisteredClass} of all {@link RegisteredClassFactory}.
      */