diff -r be143f7fe40a -r 03c1b9f44ba2 jdk/src/java.desktop/share/classes/java/awt/EventQueue.java
--- a/jdk/src/java.desktop/share/classes/java/awt/EventQueue.java	Fri Aug 18 11:25:20 2017 -0700
+++ b/jdk/src/java.desktop/share/classes/java/awt/EventQueue.java	Fri Aug 18 14:03:06 2017 -0700
@@ -1183,6 +1183,9 @@
                             AWTAccessor.getInvocationEventAccessor()
                                     .dispose((InvocationEvent)entry.event);
                         }
+                        if (entry.event instanceof SunDropTargetEvent) {
+                            ((SunDropTargetEvent)entry.event).dispose();
+                        }
                         if (prev == null) {
                             queues[i].head = entry.next;
                         } else {