--- old/src/java.desktop/windows/native/libawt/windows/awt_Toolkit.cpp	2015-08-03 17:08:40.045744100 +0300
+++ new/src/java.desktop/windows/native/libawt/windows/awt_Toolkit.cpp	2015-08-03 17:08:39.465686100 +0300
@@ -321,6 +321,7 @@
     ::GetKeyboardState(m_lastKeyboardState);
 
     m_waitEvent = ::CreateEvent(NULL, FALSE, FALSE, NULL);
+    isInDoDragDropLoop = FALSE;
     eventNumber = 0;
 }
 
@@ -2663,8 +2664,14 @@
 {
     AwtToolkit & tk = AwtToolkit::GetInstance();
     DWORD eventNumber = tk.eventNumber;
-    tk.PostMessage(WM_SYNC_WAIT, 0, 0);
-    ::WaitForSingleObject(tk.m_waitEvent, INFINITE);
+    if (!tk.isInDoDragDropLoop) {
+        tk.PostMessage(WM_SYNC_WAIT, 0, 0);
+        while (WAIT_TIMEOUT == ::WaitForSingleObject(tk.m_waitEvent, 2)) {
+            if (tk.isInDoDragDropLoop) {
+                break;
+            }
+        }
+    }
     DWORD newEventNumber = tk.eventNumber;
     return (newEventNumber - eventNumber) > 2;
 }
--- old/src/java.desktop/windows/native/libawt/windows/awt_Toolkit.h	2015-08-03 17:08:43.549094400 +0300
+++ new/src/java.desktop/windows/native/libawt/windows/awt_Toolkit.h	2015-08-03 17:08:42.958035300 +0300
@@ -385,7 +385,8 @@
     static BOOL activateKeyboardLayout(HKL hkl);
 
     HANDLE m_waitEvent;
-    DWORD eventNumber;
+    volatile DWORD eventNumber;
+    volatile BOOL isInDoDragDropLoop;
 private:
     HWND CreateToolkitWnd(LPCTSTR name);
 
--- old/src/java.desktop/windows/native/libawt/windows/awt_DnDDS.cpp	2015-08-03 17:08:46.814420900 +0300
+++ new/src/java.desktop/windows/native/libawt/windows/awt_DnDDS.cpp	2015-08-03 17:08:46.211360600 +0300
@@ -266,11 +266,14 @@
 
     dragSource->Signal();
 
+    AwtToolkit &toolkit = AwtToolkit::GetInstance();
+    toolkit.isInDoDragDropLoop = TRUE;
     res = ::DoDragDrop(dragSource,
                        dragSource,
                        convertActionsToDROPEFFECT(dragSource->m_actions),
                        &effects
           );
+    toolkit.isInDoDragDropLoop = FALSE;
 
     if (effects == DROPEFFECT_NONE && dragSource->m_dwPerformedDropEffect != DROPEFFECT_NONE) {
         effects = dragSource->m_dwPerformedDropEffect;