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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
 *  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 org.apache.tomcat.websocket.server;
In normal usage, this javax.servlet.ServletContextListener does not need to be explicitly configured as the WsSci performs all the necessary bootstrap and installs this listener in the javax.servlet.ServletContext. If the WsSci is disabled, this listener must be added manually to every javax.servlet.ServletContext that uses WebSocket to bootstrap the WsServerContainer correctly.
public class WsContextListener implements ServletContextListener {
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();
        // Don't trigger WebSocket initialization if a WebSocket Server
        // Container is already present
            WsSci.init(sce.getServletContext(), false);
    public void contextDestroyed(ServletContextEvent sce) {
        ServletContext sc = sce.getServletContext();
        if (obj instanceof WsServerContainer) {
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