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diff --git a/javaunohelper/com/sun/star/lib/uno/helper/ComponentBase.java b/javaunohelper/com/sun/star/lib/uno/helper/ComponentBase.java
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+++ b/javaunohelper/com/sun/star/lib/uno/helper/ComponentBase.java
@@ -0,0 +1,165 @@
+/*************************************************************************
+ *
+ *  $RCSfile: ComponentBase.java,v $
+ *
+ *  $Revision: 1.1 $
+ *
+ *  last change: $Author: jl $ $Date: 2002-04-11 13:39:51 $
+ *
+ *  The Contents of this file are made available subject to the terms of
+ *  either of the following licenses
+ *
+ *         - GNU Lesser General Public License Version 2.1
+ *         - Sun Industry Standards Source License Version 1.1
+ *
+ *  Sun Microsystems Inc., October, 2000
+ *
+ *  GNU Lesser General Public License Version 2.1
+ *  =============================================
+ *  Copyright 2000 by Sun Microsystems, Inc.
+ *  901 San Antonio Road, Palo Alto, CA 94303, USA
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Lesser General Public
+ *  License version 2.1, as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ *  MA  02111-1307  USA
+ *
+ *
+ *  Sun Industry Standards Source License Version 1.1
+ *  =================================================
+ *  The contents of this file are subject to the Sun Industry Standards
+ *  Source License Version 1.1 (the "License"); You may not use this file
+ *  except in compliance with the License. You may obtain a copy of the
+ *  License at http://www.openoffice.org/license.html.
+ *
+ *  Software provided under this License is provided on an "AS IS" basis,
+ *  WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
+ *  WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
+ *  MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
+ *  See the License for the specific provisions governing your rights and
+ *  obligations concerning the Software.
+ *
+ *  The Initial Developer of the Original Code is: Sun Microsystems, Inc.
+ *
+ *  Copyright: 2000 by Sun Microsystems, Inc.
+ *
+ *  All Rights Reserved.
+ *
+ *  Contributor(s): _______________________________________
+ *
+ *
+ ************************************************************************/
+
+package com.sun.star.lib.uno.helper;
+import com.sun.star.lang.XComponent;
+import com.sun.star.lang.XEventListener;
+import com.sun.star.lang.EventObject;
+import java.util.List;
+import java.util.Collections;
+import java.util.LinkedList;
+import com.sun.star.uno.Type;
+
+/** This class can be used as the base class for UNO components. In addition to the functionality ,which
+ *  is inherited from WeakBase, it implements com.sun.star.lang.XComponent.
+ */
+public class ComponentBase extends WeakBase implements XComponent
+{
+    private final boolean DEBUG= false;
+    public MultiTypeInterfaceContainer listenerContainer;
+    private boolean bDisposed= false;
+    static final Type  EVT_LISTENER_TYPE= new Type(XEventListener.class);
+
+    
+    /** Creates a new instance of CompBase */
+    public ComponentBase()
+    {
+        super();
+        listenerContainer= new MultiTypeInterfaceContainer();
+    }
+    
+    /** Override to perform extra clean-up work. Provided for subclasses. It is 
+        called during dispose()
+     */
+    public void disposing()
+    {
+    }
+    
+    /** Method of XComponent. It is called by the owning client when the component is not needed 
+     *  anymore. The registered listeners are notified that this method has been called.
+     */
+    public void dispose()
+    {
+        //Assuming that listener release references to this object during the
+        // disposing call then it might happen that this object is being unreferenced
+        // which leads to be gc'ed and the notification might be interrupted.
+        ComponentBase selfRef= this;
+        // Determine in a thread-safe way if this is the first call to this method.
+        // Only then we proceed with the notification of event listeners.
+        // It is an error to call this method more then once.
+        boolean bDoDispose= false;
+        synchronized (this)
+        {
+            if ( bDisposed == false)
+            {
+                bDoDispose= true;
+                bDisposed= true;
+            }
+        }
+        // The notification occures in an unsynchronized block in order to avoid
+        // deadlocks if one of the listeners calls back in a different thread on
+        // a synchronized method which uses the same object.
+        if (bDoDispose)
+        {
+            listenerContainer.disposeAndClear(new EventObject(this));
+            //notify subclasses that disposing is in progress
+            disposing();
+        }
+        else
+        {
+            // in a multithreaded environment, it can't be avoided, that dispose is called twice.
+            // However this condition is traced, because it MAY indicate an error.
+            if (DEBUG)
+                System.out.println("OComponentHelper::dispose() - dispose called twice" );
+        }
+        selfRef= null;
+    }
+    
+    /** Method of XComponent.
+     */
+    public void removeEventListener(XEventListener xEventListener)
+    {   
+        listenerContainer.removeInterface( EVT_LISTENER_TYPE, xEventListener);
+    }
+    
+    public void addEventListener(XEventListener listener)
+    {
+        boolean bDoDispose= false;
+        synchronized (this)
+        {
+            if (bDisposed == true)
+                bDoDispose= true;
+            else
+               listenerContainer.addInterface(EVT_LISTENER_TYPE, listener);
+        }
+        if (bDoDispose )
+        {
+            listener.disposing( new EventObject(this));
+        }
+    }  
+    
+    protected void finalize() throws Throwable
+    {
+        if (bDisposed == false)
+            dispose();
+        super.finalize();
+    }
+}