1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package apple.launcher;
  27 
  28 import java.io.*;
  29 import java.lang.reflect.*;
  30 import java.text.MessageFormat;
  31 import java.util.*;
  32 import java.util.jar.*;
  33 
  34 import javax.swing.*;
  35 
  36 class JavaAppLauncher implements Runnable {
  37     static {
  38         java.security.AccessController.doPrivileged(
  39             new java.security.PrivilegedAction<Void>() {
  40                 public Void run() {
  41                     System.loadLibrary("osx");
  42                     return null;
  43                 }
  44             });
  45     }
  46 
  47     private static native <T> T nativeConvertAndRelease(final long ptr);
  48     private static native void nativeInvokeNonPublic(Class<? extends Method> cls, Method m, String[] args);
  49 
  50     // entry point from native
  51     static void launch(final long javaDictionaryPtr, final boolean verbose) {
  52         final Map<String, ?> javaDictionary = nativeConvertAndRelease(javaDictionaryPtr);
  53         (new JavaAppLauncher(javaDictionary, verbose)).run();
  54     }
  55 
  56         // these are the values for the enumeration JavaFailureMode
  57         static final String kJavaFailureMainClassNotSpecified = "MainClassNotSpecified";
  58         static final String kJavaFailureMainClassNotFound = "CannotLoadMainClass";
  59         static final String kJavaFailureMainClassHasNoMain = "NoMainMethod";
  60         static final String kJavaFailureMainClassMainNotStatic = "MainNotStatic";
  61         static final String kJavaFailureMainThrewException = "MainThrewException";
  62         static final String kJavaFailureMainInitializerException = "MainInitializerException";
  63 
  64         final boolean verbose; // Normally set by environment variable JAVA_LAUNCHER_VERBOSE.
  65         final Map<String, ?> javaDictionary;
  66 
  67         JavaAppLauncher(final Map<String, ?> javaDictionary, final boolean verbose) {
  68                 this.verbose = verbose;
  69                 this.javaDictionary = javaDictionary;
  70         }
  71 
  72         @Override
  73         public void run() {
  74                 final Method m = loadMainMethod(getMainMethod());
  75                 final String methodName = m.getDeclaringClass().getName() + ".main(String[])";
  76                 try {
  77                         log("Calling " + methodName + " method");
  78                         m.invoke(null, new Object[] { getArguments() });
  79                         log(methodName + " has returned");
  80                 } catch (final IllegalAccessException x) {
  81                         try {
  82                                 nativeInvokeNonPublic(m.getClass(), m, getArguments());
  83                         } catch (final Throwable excpt) {
  84                                 logError(methodName + " threw an exception:");
  85                                 if ((excpt instanceof UnsatisfiedLinkError) && excpt.getMessage().equals("nativeInvokeNonPublic")) {
  86                                         showFailureAlertAndKill(kJavaFailureMainThrewException, "nativeInvokeNonPublic not registered");
  87                                 } else {
  88                                         excpt.printStackTrace();
  89                                         showFailureAlertAndKill(kJavaFailureMainThrewException, excpt.toString());
  90                                 }
  91                         }
  92                 } catch (final InvocationTargetException invokeExcpt) {
  93                         logError(methodName + " threw an exception:");
  94                         invokeExcpt.getTargetException().printStackTrace();
  95                         showFailureAlertAndKill(kJavaFailureMainThrewException, invokeExcpt.getTargetException().toString());
  96                 }
  97         }
  98 
  99         Method loadMainMethod(final String mainClassName) {
 100                 try {
 101                         final Class<?> mainClass = Class.forName(mainClassName, true, sun.misc.Launcher.getLauncher().getClassLoader());
 102                         final Method mainMethod = mainClass.getDeclaredMethod("main", new Class[] { String[].class });
 103                         if ((mainMethod.getModifiers() & Modifier.STATIC) == 0) {
 104                                 logError("The main(String[]) method of class " + mainClassName + " is not static!");
 105                                 showFailureAlertAndKill(kJavaFailureMainClassMainNotStatic, mainClassName);
 106                         }
 107                         return mainMethod;
 108                 } catch (final ExceptionInInitializerError x) {
 109                         logError("The main class \"" + mainClassName + "\" had a static initializer throw an exception.");
 110                         x.getException().printStackTrace();
 111                         showFailureAlertAndKill(kJavaFailureMainInitializerException, x.getException().toString());
 112                 } catch (final ClassNotFoundException x) {
 113                         logError("The main class \"" + mainClassName + "\" could not be found.");
 114                         showFailureAlertAndKill(kJavaFailureMainClassNotFound, mainClassName);
 115                 } catch (final NoSuchMethodException x) {
 116                         logError("The main class \"" + mainClassName + "\" has no static main(String[]) method.");
 117                         showFailureAlertAndKill(kJavaFailureMainClassHasNoMain, mainClassName);
 118                 } catch (final NullPointerException x) {
 119                         logError("No main class specified");
 120                         showFailureAlertAndKill(kJavaFailureMainClassNotSpecified, null);
 121                 }
 122 
 123                 return null;
 124         }
 125 
 126         // get main class name from 'Jar' key, or 'MainClass' key
 127         String getMainMethod() {
 128                 final Object javaJar = javaDictionary.get("Jar");
 129                 if (javaJar != null) {
 130                         if (!(javaJar instanceof String)) {
 131                                 logError("'Jar' key in 'Java' sub-dictionary of Info.plist requires a string value");
 132                                 return null;
 133                         }
 134 
 135                         final String jarPath = (String)javaJar;
 136                         if (jarPath.length() == 0) {
 137                                 log("'Jar' key of sub-dictionary 'Java' of Info.plist key is empty");
 138                         } else {
 139                                 // extract main class from manifest of this jar
 140                                 final String main = getMainFromManifest(jarPath);
 141                                 if (main == null) {
 142                                         logError("jar file '" + jarPath + "' does not have Main-Class: attribute in its manifest");
 143                                         return null;
 144                                 }
 145 
 146                                 log("Main class " + main + " found in jar manifest");
 147                                 return main;
 148                         }
 149                 }
 150 
 151                 final Object javaMain = javaDictionary.get("MainClass");
 152                 if (!(javaMain instanceof String)) {
 153                         logError("'MainClass' key in 'Java' sub-dictionary of Info.plist requires a string value");
 154                         return null;
 155                 }
 156 
 157                 final String main = (String)javaMain;
 158                 if (main.length() == 0) {
 159                         log("'MainClass' key of sub-dictionary 'Java' of Info.plist key is empty");
 160                         return null;
 161                 }
 162 
 163                 log("Main class " + (String)javaMain + " found via 'MainClass' key of sub-dictionary 'Java' of Info.plist key");
 164                 return (String)javaMain;
 165         }
 166 
 167         // get arguments for main(String[]) out of Info.plist and command line
 168         String[] getArguments() {
 169                 // check for 'Arguments' key, which contains the main() args if not defined in Info.plist
 170                 final Object javaArguments = javaDictionary.get("Arguments");
 171                 if (javaArguments == null) {
 172                         // no arguments
 173                         log("No arguments for main(String[]) specified");
 174                         return new String[0];
 175                 }
 176 
 177                 if (javaArguments instanceof List) {
 178                         final List<?> args = (List<?>)javaArguments;
 179                         final int count = args.size();
 180                         log("Arguments to main(String[" + count + "]):");
 181 
 182                         final String[] result = new String[count];
 183                         for (int i = 0; i < count; ++i) {
 184                                 final Object element = args.get(i);
 185                                 if (element instanceof String) {
 186                                         result[i] = (String)element;
 187                                 } else {
 188                                         logError("Found non-string in array");
 189                                 }
 190                                 log("   arg[" + i + "]=" + result[i]);
 191                         }
 192                         return result;
 193                 }
 194 
 195                 logError("'Arguments' key in 'Java' sub-dictionary of Info.plist requires a string value or an array of strings");
 196                 return new String[0];
 197         }
 198 
 199         // returns name of main class, or null
 200         String getMainFromManifest(final String jarpath) {
 201                 JarFile jar = null;
 202                 try {
 203                         jar = new JarFile(jarpath);
 204                         final Manifest man = jar.getManifest();
 205                         final Attributes attr = man.getMainAttributes();
 206                         return attr.getValue("Main-Class");
 207                 } catch (final IOException x) {
 208                         // shrug
 209                 } finally {
 210                         if (jar != null) {
 211                                 try {
 212                                         jar.close();
 213                                 } catch (final IOException x) { }
 214                         }
 215                 }
 216                 return null;
 217         }
 218 
 219         void log(final String s) {
 220                 if (!verbose) return;
 221                 System.out.println("[LaunchRunner] " + s);
 222         }
 223 
 224         static void logError(final String s) {
 225                 System.err.println("[LaunchRunner Error] " + s);
 226         }
 227 
 228         // This kills the app and does not return!
 229         static void showFailureAlertAndKill(final String msg, String arg) {
 230                 if (arg == null) arg = "<<null>>";
 231                 JOptionPane.showMessageDialog(null, getMessage(msg, arg), "", JOptionPane.ERROR_MESSAGE);
 232                 System.exit(-1);
 233         }
 234 
 235         static String getMessage(final String msgKey, final Object ... args) {
 236             final String msg = ResourceBundle.getBundle("appLauncherErrors").getString(msgKey);
 237             return MessageFormat.format(msg, args);
 238         }
 239 }