I'm learning about the platform's DnD interfaces and capabilities. In the Node
docs for "drag" it says
    The node can attach a transfer listener to ExTransferable and will
    be then notified about progress of the drag (accept/reject).
But that doesn't seem to work.

The following is based on the example at
    https://blogs.oracle.com/geertjan/entry/node_cut_copy_paste_delete
I add "hook" see code below, to the return from clipboardCopy,clipboardCut
and never see any log output from listener during DnD operation.


Drag a node to the other conatainer, note there is no finish method invoked

    INFO [debug]: hook-cut: ...ExTransferable@9db941e
    INFO [debug]: hook-copy: ...ExTransferable@3a31e13e

doing a popup menu "Copy" produces the following output, note that this
is only the copy menu operation (no paste or DnD or anything else)

    INFO [debug]: hook-copy: ...ExTransferable@4d71cf43
    INFO [debug]: drag-finish lost-owner-copy



The following diff leaves out the additional import statements
=== hook added to clipboardCut, clipboardCopy return ===

diff --git      a/CustomerViewer/src/org/customer/viewer/CustomerNode.java
                b/CustomerViewer/src/org/customer/viewer/CustomerNode.java

@@ -69,7 +73,7 @@
                 return getLookup().lookup(Customer.class);
             }
         });
-        return added;
+        return hook(added, "cut");
     }

     @Override
@@ -82,7 +86,20 @@
                 return getLookup().lookup(Customer.class);
             }
         });
-        return added;
+        return hook(added, "copy");
     }
-
+
+    private static final Logger LOG = Logger.getLogger("debug");
+    private ExTransferable hook(ExTransferable t, String tag) {
+        LOG.info(()->"hook-"+tag+": "+t);
+        t.addTransferListener(new TransferListener() {
+            void fin(String s) {
+                LOG.info(()->"drag-finish " + s + tag);
+            }
+            @Override public void accepted(int action) { fin("accepted-"); }
+            @Override public void rejected() { fin("rejected-"); }
+            @Override public void ownershipLost() { fin("lost-owner-"); }
+        });
+        return t;
+    }
 }


Product Version: NetBeans IDE 8.0.2 (Build 201411181905)
Java: 1.8.0_40; Java HotSpot(TM) 64-Bit Server VM 25.40-b25
Runtime: Java(TM) SE Runtime Environment 1.8.0_40-b26
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