Index: openide/loaders/src/org/openide/loaders/FolderInstance.java
===================================================================
RCS file: /cvs/openide/loaders/src/org/openide/loaders/FolderInstance.java,v
retrieving revision 1.7
diff -u -r1.7 FolderInstance.java
--- openide/loaders/src/org/openide/loaders/FolderInstance.java	20 Aug 2004 14:29:33 -0000	1.7
+++ openide/loaders/src/org/openide/loaders/FolderInstance.java	17 Sep 2004 15:59:51 -0000
@@ -128,6 +128,9 @@
      */
     private Task creationTask;
     
+    /** Set of folders to which this object listens to */
+    private Map folders = new HashMap ();
+    
     /* -------------------------------------------------------------------- */
     /* -- Constructor(s) -------------------------------------------------- */
     /* -------------------------------------------------------------------- */
@@ -174,6 +177,15 @@
         container.addPropertyChangeListener (
             org.openide.util.WeakListeners.propertyChange (listener, container)
         );
+        if (folders.containsKey (container)) {
+            System.out.println("Adding "+this+" to "+container+" again");
+            Thread.dumpStack();
+            System.out.println("first add was from ");
+            ((Exception)folders.get(container)).printStackTrace ();
+        }
+        else {
+            folders.put(container, new Exception());
+        }
         
         if (err.isLoggable (err.INFORMATIONAL)) {
             err.log ("new " + this); // NOI18N
@@ -659,6 +671,15 @@
                     obj.addPropertyChangeListener (
                         org.openide.util.WeakListeners.propertyChange (listener, obj)
                     );
+        if (folders.containsKey (obj)) {
+            System.out.println("Adding "+this+" to "+obj+" again");
+            Thread.dumpStack();
+            System.out.println("first add was from ");
+            ((Exception)folders.get(obj)).printStackTrace ();
+        }
+        else {
+            folders.put(obj, new Exception());
+        }
                     
                     cookies.add (hold);
                 } else {
@@ -688,6 +709,15 @@
                 obj.addPropertyChangeListener (
                     org.openide.util.WeakListeners.propertyChange (listener, obj)
                 );
+        if (folders.containsKey (obj)) {
+            System.out.println("Adding "+this+" to "+obj+" again");
+            Thread.dumpStack();
+            System.out.println("first add was from ");
+            ((Exception)folders.get(obj)).printStackTrace ();
+        }
+        else {
+            folders.put(obj, new Exception());
+        }
                 
             }