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diff --git a/lib/servlet-api/javax/servlet/http/HttpSessionBindingListener.java b/lib/servlet-api/javax/servlet/http/HttpSessionBindingListener.java
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+++ b/lib/servlet-api/javax/servlet/http/HttpSessionBindingListener.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;
+
+/**
+ * Causes an object to be notified when it is bound to or unbound from a
+ * session. The object is notified by an {@link HttpSessionBindingEvent} object.
+ * This may be as a result of a servlet programmer explicitly unbinding an
+ * attribute from a session, due to a session being invalidated, or due to a
+ * session timing out.
+ *
+ * @see HttpSession
+ * @see HttpSessionBindingEvent
+ */
+public interface HttpSessionBindingListener extends EventListener {
+
+    /**
+     * Notifies the object that it is being bound to a session and identifies
+     * the session.
+     *
+     * @param event
+     *            the event that identifies the session
+     * @see #valueUnbound
+     */
+    public void valueBound(HttpSessionBindingEvent event);
+
+    /**
+     * Notifies the object that it is being unbound from a session and
+     * identifies the session.
+     *
+     * @param event
+     *            the event that identifies the session
+     * @see #valueBound
+     */
+    public void valueUnbound(HttpSessionBindingEvent event);
+}