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1 package org.codehaus.classworlds.uberjar.boot; 2 3 /* 4 $Id: Bootstrapper.java,v 1.2 2003/09/23 18:42:21 jvanzyl Exp $ 5 6 Copyright 2002 (C) The Werken Company. All Rights Reserved. 7 8 Redistribution and use of this software and associated documentation 9 ("Software"), with or without modification, are permitted provided 10 that the following conditions are met: 11 12 1. Redistributions of source code must retain copyright 13 statements and notices. Redistributions must also contain a 14 copy of this document. 15 16 2. Redistributions in binary form must reproduce the 17 above copyright notice, this list of conditions and the 18 following disclaimer in the documentation and/or other 19 materials provided with the distribution. 20 21 3. The name "classworlds" must not be used to endorse or promote 22 products derived from this Software without prior written 23 permission of The Werken Company. For written permission, 24 please contact bob@werken.com. 25 26 4. Products derived from this Software may not be called "classworlds" 27 nor may "classworlds" appear in their names without prior written 28 permission of The Werken Company. "classworlds" is a registered 29 trademark of The Werken Company. 30 31 5. Due credit should be given to The Werken Company. 32 (http://classworlds.werken.com/). 33 34 THIS SOFTWARE IS PROVIDED BY THE WERKEN COMPANY AND CONTRIBUTORS 35 ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT 36 NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 37 FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL 38 THE WERKEN COMPANY OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 39 INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 40 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 41 SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 42 HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 43 STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 44 ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 45 OF THE POSSIBILITY OF SUCH DAMAGE. 46 47 */ 48 49 import java.lang.reflect.Method; 50 import java.lang.reflect.Modifier; 51 52 /*** Bootstrapping entry-point. 53 * 54 * <p> 55 * The <code>Bootstrapper</code> is to be used for standalone jars 56 * which carry all dependency jars within them. The layout for 57 * the dependency jar should be similar to: 58 * </p> 59 * 60 * <pre> 61 * myjar/ 62 * classworlds.conf 63 * org/ 64 * codehaus/ 65 * classworlds/ 66 * boot/ 67 * protocol/ 68 * lib/ 69 * myapp.jar 70 * depOne.jar 71 * depTwo.jar 72 * </pre> 73 * 74 * @author <a href="mailto:jason@zenplex.com">Jason van Zyl</a> 75 * @author <a href="mailto:bob@eng.werken.com">bob mcwhirter</a> 76 * 77 * @version $Id: Bootstrapper.java,v 1.2 2003/09/23 18:42:21 jvanzyl Exp $ 78 */ 79 public class Bootstrapper 80 { 81 // ---------------------------------------------------------------------- 82 // Constants 83 // ---------------------------------------------------------------------- 84 85 /*** Main classworlds entry class. */ 86 public static final String LAUNCHER_CLASS_NAME = "org.codehaus.classworlds.Launcher"; 87 88 // ---------------------------------------------------------------------- 89 // Instance members 90 // ---------------------------------------------------------------------- 91 92 /*** Command-line args. */ 93 private String[] args; 94 95 /*** Initial bootstrapping classloader. */ 96 private InitialClassLoader classLoader; 97 98 // ---------------------------------------------------------------------- 99 // Class methods 100 // ---------------------------------------------------------------------- 101 102 /*** Main entry-point. 103 * 104 * @param args Command-line arguments. 105 * 106 * @throws Exception If an error occurs. 107 */ 108 public static void main(String[] args) 109 throws Exception 110 { 111 System.setProperty( "java.protocol.handler.pkgs", 112 "org.codehaus.classworlds.uberjar.protocol" ); 113 114 Bootstrapper bootstrapper = new Bootstrapper( args ); 115 116 bootstrapper.bootstrap(); 117 } 118 119 // ---------------------------------------------------------------------- 120 // Constructors 121 // ---------------------------------------------------------------------- 122 123 /*** Construct. 124 * 125 * @param args Command-line arguments. 126 * 127 * @throws Exception If an error occurs attempting to perform 128 * bootstrap initialization. 129 */ 130 public Bootstrapper(String[] args) 131 throws Exception 132 { 133 this.args = args; 134 this.classLoader = new InitialClassLoader(); 135 } 136 137 // ---------------------------------------------------------------------- 138 // Instance methods 139 // ---------------------------------------------------------------------- 140 141 /*** Retrieve the initial bootstrapping <code>ClassLoader</code>. 142 * 143 * @return The classloader. 144 */ 145 protected ClassLoader getInitialClassLoader() 146 { 147 return this.classLoader; 148 } 149 150 /*** Perform bootstrap. 151 * 152 * @throws Exception If an error occurs while bootstrapping. 153 */ 154 public void bootstrap() 155 throws Exception 156 { 157 ClassLoader cl = getInitialClassLoader(); 158 159 Class launcherClass = cl.loadClass( LAUNCHER_CLASS_NAME ); 160 161 Method[] methods = launcherClass.getMethods(); 162 Method mainMethod = null; 163 164 for ( int i = 0 ; i < methods.length ; ++i ) 165 { 166 if ( ! "main".equals( methods[i].getName() ) ) 167 { 168 continue; 169 } 170 171 int modifiers = methods[i].getModifiers(); 172 173 if ( !( Modifier.isStatic( modifiers ) 174 && 175 Modifier.isPublic( modifiers ) ) ) 176 { 177 continue; 178 } 179 180 if ( methods[i].getReturnType() != Void.TYPE ) 181 { 182 continue; 183 } 184 185 Class[] paramTypes = methods[i].getParameterTypes(); 186 187 if (paramTypes.length != 1) 188 { 189 continue; 190 } 191 192 if (paramTypes[0] != String[].class) 193 { 194 continue; 195 } 196 197 mainMethod = methods[i]; 198 break; 199 } 200 201 if ( mainMethod == null ) 202 { 203 throw new NoSuchMethodException( LAUNCHER_CLASS_NAME + "::main(String[] args)" ); 204 } 205 206 System.setProperty( "classworlds.bootstrapped", 207 "true" ); 208 209 mainMethod.invoke( launcherClass, 210 new Object[] { this.args } ); 211 } 212 }

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