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diff --git a/lib/servlet-api/javax/servlet/ServletContextAttributeListener.java b/lib/servlet-api/javax/servlet/ServletContextAttributeListener.java
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+++ b/lib/servlet-api/javax/servlet/ServletContextAttributeListener.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;
+
+/**
+ * Implementations of this interface receive notifications of changes to the
+ * attribute list on the servlet context of a web application. To receive
+ * notification events, the implementation class must be configured in the
+ * deployment descriptor for the web application.
+ *
+ * @see ServletContextAttributeEvent
+ * @since v 2.3
+ */
+
+public interface ServletContextAttributeListener extends EventListener {
+    /**
+     * Notification that a new attribute was added to the servlet context.
+     * Called after the attribute is added.
+     */
+    public void attributeAdded(ServletContextAttributeEvent scab);
+
+    /**
+     * Notification that an existing attribute has been removed from the servlet
+     * context. Called after the attribute is removed.
+     */
+    public void attributeRemoved(ServletContextAttributeEvent scab);
+
+    /**
+     * Notification that an attribute on the servlet context has been replaced.
+     * Called after the attribute is replaced.
+     */
+    public void attributeReplaced(ServletContextAttributeEvent scab);
+}