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diff --git a/lib/servlet-api/javax/servlet/ServletRequestAttributeListener.java b/lib/servlet-api/javax/servlet/ServletRequestAttributeListener.java
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+++ b/lib/servlet-api/javax/servlet/ServletRequestAttributeListener.java
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+/*
+* Licensed to the Apache Software Foundation (ASF) under one or more
+* contributor license agreements.  See the NOTICE file distributed with
+* this work for additional information regarding copyright ownership.
+* The ASF licenses this file to You under the Apache License, Version 2.0
+* (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.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+package javax.servlet;
+
+import java.util.EventListener;
+
+    /**
+     * A ServletRequestAttributeListener can be implemented by the
+     * developer interested in being notified of request attribute
+     * changes. Notifications will be generated while the request
+     * is within the scope of the web application in which the listener
+     * is registered. A request is defined as coming into scope when
+     * it is about to enter the first servlet or filter in each web
+     * application, as going out of scope when it exits the last servlet
+     * or the first filter in the chain.
+     *
+     * @since Servlet 2.4
+     */
+
+public interface ServletRequestAttributeListener extends EventListener {
+    /** Notification that a new attribute was added to the
+     ** servlet request. Called after the attribute is added.
+     */
+    public void attributeAdded(ServletRequestAttributeEvent srae);
+
+    /** Notification that an existing attribute has been removed from the
+     ** servlet request. Called after the attribute is removed.
+     */
+    public void attributeRemoved(ServletRequestAttributeEvent srae);
+
+    /** Notification that an attribute was replaced on the
+     ** servlet request. Called after the attribute is replaced.
+     */
+    public void attributeReplaced(ServletRequestAttributeEvent srae);
+}
+