001    /**
002     *  Licensed to the Apache Software Foundation (ASF) under one or more
003     *  contributor license agreements.  See the NOTICE file distributed with
004     *  this work for additional information regarding copyright ownership.
005     *  The ASF licenses this file to You under the Apache License, Version 2.0
006     *  (the "License"); you may not use this file except in compliance with
007     *  the License.  You may obtain a copy of the License at
008     *
009     *     http://www.apache.org/licenses/LICENSE-2.0
010     *
011     *  Unless required by applicable law or agreed to in writing, software
012     *  distributed under the License is distributed on an "AS IS" BASIS,
013     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     *  See the License for the specific language governing permissions and
015     *  limitations under the License.
016     */
017    
018    package org.apache.geronimo.common;
019    
020    import java.net.URL;
021    import java.io.IOException;
022    
023    
024    /**
025     * Used to perform common initialization tasks for Geronimo server, deploy, and client environments.
026     * @version $Rev: 706640 $ $Date: 2008-10-21 14:44:05 +0000 (Tue, 21 Oct 2008) $
027     */
028    public class GeronimoEnvironment {
029    
030        /**
031         * Performs common initialization for the various Geronimo process environments: server, deploy, and client.
032         */
033        public static void init() {
034            // Setting useCaches to false avoids a memory leak of URLJarFile instances
035            // It's a workaround for a Sun bug (see bug id 4167874). Otherwise, 
036            // URLJarFiles will never be garbage collected. o.a.g.deployment.util.DeploymentUtil.readAll() 
037            // causes URLJarFiles to be created
038            try {
039                // Protocol/file shouldn't matter. 
040                // As long as we don't get an input/output stream, no operations should occur...
041                new URL("http://a").openConnection().setDefaultUseCaches(false);
042            }
043            catch (IOException ioe) {
044                // Can't Log this. Should we send to STDOUT/STDERR?
045            }
046        }
047    
048    }