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diff --git a/lib/servlet-api/javax/servlet/http/HttpSessionAttributeListener.java b/lib/servlet-api/javax/servlet/http/HttpSessionAttributeListener.java
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+++ b/lib/servlet-api/javax/servlet/http/HttpSessionAttributeListener.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.http;
+
+import java.util.EventListener;
+
+/**
+ * This listener interface can be implemented in order to get notifications of
+ * changes to the attribute lists of sessions within this web application.
+ *
+ * @since v 2.3
+ */
+public interface HttpSessionAttributeListener extends EventListener {
+
+    /**
+     * Notification that an attribute has been added to a session. Called after
+     * the attribute is added.
+     */
+    public void attributeAdded(HttpSessionBindingEvent se);
+
+    /**
+     * Notification that an attribute has been removed from a session. Called
+     * after the attribute is removed.
+     */
+    public void attributeRemoved(HttpSessionBindingEvent se);
+
+    /**
+     * Notification that an attribute has been replaced in a session. Called
+     * after the attribute is replaced.
+     */
+    public void attributeReplaced(HttpSessionBindingEvent se);
+}