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diff --git a/lib/servlet-api/javax/servlet/http/HttpSessionBindingEvent.java b/lib/servlet-api/javax/servlet/http/HttpSessionBindingEvent.java
new file mode 100644
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+++ b/lib/servlet-api/javax/servlet/http/HttpSessionBindingEvent.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;
+
+/**
+ * Events of this type are either sent to an object that implements
+ * {@link HttpSessionBindingListener} when it is bound or unbound from a
+ * session, or to a {@link HttpSessionAttributeListener} that has been
+ * configured in the deployment descriptor when any attribute is bound, unbound
+ * or replaced in a session.
+ * <p>
+ * The session binds the object by a call to
+ * <code>HttpSession.setAttribute</code> and unbinds the object by a call to
+ * <code>HttpSession.removeAttribute</code>.
+ *
+ * @see HttpSession
+ * @see HttpSessionBindingListener
+ * @see HttpSessionAttributeListener
+ */
+public class HttpSessionBindingEvent extends HttpSessionEvent {
+
+    private static final long serialVersionUID = 1L;
+
+    /* The name to which the object is being bound or unbound */
+    private final String name;
+
+    /* The object is being bound or unbound */
+    private final Object value;
+
+    /**
+     * Constructs an event that notifies an object that it has been bound to or
+     * unbound from a session. To receive the event, the object must implement
+     * {@link HttpSessionBindingListener}.
+     *
+     * @param session
+     *            the session to which the object is bound or unbound
+     * @param name
+     *            the name with which the object is bound or unbound
+     * @see #getName
+     * @see #getSession
+     */
+    public HttpSessionBindingEvent(HttpSession session, String name) {
+        super(session);
+        this.name = name;
+        this.value = null;
+    }
+
+    /**
+     * Constructs an event that notifies an object that it has been bound to or
+     * unbound from a session. To receive the event, the object must implement
+     * {@link HttpSessionBindingListener}.
+     *
+     * @param session
+     *            the session to which the object is bound or unbound
+     * @param name
+     *            the name with which the object is bound or unbound
+     * @see #getName
+     * @see #getSession
+     */
+    public HttpSessionBindingEvent(HttpSession session, String name,
+            Object value) {
+        super(session);
+        this.name = name;
+        this.value = value;
+    }
+
+    /** Return the session that changed. */
+    @Override
+    public HttpSession getSession() {
+        return super.getSession();
+    }
+
+    /**
+     * Returns the name with which the attribute is bound to or unbound from the
+     * session.
+     *
+     * @return a string specifying the name with which the object is bound to or
+     *         unbound from the session
+     */
+    public String getName() {
+        return name;
+    }
+
+    /**
+     * Returns the value of the attribute that has been added, removed or
+     * replaced. If the attribute was added (or bound), this is the value of the
+     * attribute. If the attribute was removed (or unbound), this is the value
+     * of the removed attribute. If the attribute was replaced, this is the old
+     * value of the attribute.
+     *
+     * @since 2.3
+     */
+    public Object getValue() {
+        return this.value;
+    }
+}