diff -r 90d02f574c3c project.libraries/src/org/netbeans/modules/project/libraries/LibrariesStorage.java
--- a/project.libraries/src/org/netbeans/modules/project/libraries/LibrariesStorage.java	Mon Dec 01 15:30:17 2008 +0100
+++ b/project.libraries/src/org/netbeans/modules/project/libraries/LibrariesStorage.java	Mon Dec 01 17:40:59 2008 +0100
@@ -72,12 +72,15 @@
 import org.openide.filesystems.FileUtil;
 import org.openide.filesystems.Repository;
 import org.openide.util.NbBundle;
+import org.openide.util.Task;
+import org.openide.util.TaskListener;
 import org.openide.xml.XMLUtil;
 import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 
 @org.openide.util.lookup.ServiceProvider(service=org.netbeans.spi.project.libraries.LibraryProvider.class)
-public class LibrariesStorage extends FileChangeAdapter implements WritableLibraryProvider<LibraryImplementation> {
+public class LibrariesStorage extends FileChangeAdapter
+implements WritableLibraryProvider<LibraryImplementation>, TaskListener {
 
     private static final String NB_HOME_PROPERTY = "netbeans.home";  //NOI18N
     private static final String LIBRARIES_REPOSITORY = "org-netbeans-api-project-libraries/Libraries";  //NOI18N
@@ -206,6 +209,7 @@
             }            
             this.loadFromStorage();            
             this.storage.addFileChangeListener (this);
+            LibraryTypeRegistry.getDefault().addTaskListener(this);
             initialized = true;
         }
     }
@@ -564,4 +568,15 @@
         return sb.toString();
     }
 
+    public void taskFinished(Task task) {
+        if (initialized) {
+            HashMap<String, LibraryImplementation> clone;
+            clone = new HashMap<String,LibraryImplementation>(libraries);
+            loadFromStorage();
+            if (!clone.equals(libraries)) {
+                fireLibrariesChanged();
+            }
+        }
+    }
+
 }
diff -r 90d02f574c3c project.libraries/test/unit/src/org/netbeans/modules/project/libraries/LibrariesStorageTest.java
--- a/project.libraries/test/unit/src/org/netbeans/modules/project/libraries/LibrariesStorageTest.java	Mon Dec 01 15:30:17 2008 +0100
+++ b/project.libraries/test/unit/src/org/netbeans/modules/project/libraries/LibrariesStorageTest.java	Mon Dec 01 17:40:59 2008 +0100
@@ -174,7 +174,7 @@
         }
     }
     
-    private static void registerLibraryTypeProvider () throws Exception {
+    static void registerLibraryTypeProvider () throws Exception {
         StringTokenizer tk = new StringTokenizer("org-netbeans-api-project-libraries/LibraryTypeProviders","/");
         FileObject root = Repository.getDefault().getDefaultFileSystem().getRoot();
         while (tk.hasMoreElements()) {
@@ -192,7 +192,7 @@
         }
     }
     
-    private static void createLibraryDefinition (final FileObject storageFolder, final String libName) throws IOException {
+    static void createLibraryDefinition (final FileObject storageFolder, final String libName) throws IOException {
         storageFolder.getFileSystem().runAtomicAction(new FileSystem.AtomicAction() {
             public void run () throws IOException {
                 FileObject defFile = storageFolder.createData(libName,"xml");
@@ -222,7 +222,7 @@
         });
     }
     
-    private static class TestListener implements PropertyChangeListener {
+    static class TestListener implements PropertyChangeListener {
         
         private List<String> eventNames = new ArrayList<String>();
         
@@ -241,7 +241,7 @@
     }
     
     
-    private static class TestEntityCatalog extends EntityCatalog {        
+    static class TestEntityCatalog extends EntityCatalog {        
         
         private static final String DTD = "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
             "<!ELEMENT library (name, type, description?, localizing-bundle?, volume*) >\n" +