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+// Copyright (C) 2001-2003 Jon A. Maxwell (JAM)
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; either
+// version 2.1 of the License, or (at your option) any later version.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+
+package net.sourceforge.jnlp.runtime;
+
+import java.lang.reflect.*;
+import java.io.*;
+import java.net.*;
+import java.security.*;
+import javax.swing.*;
+
+/**
+ * Allows a Policy and SecurityManager to be set in JRE1.3 without
+ * running the code with only applet permissions; this class is
+ * for backward compatibility only and is totally unnecessary if
+ * running in jdk 1.4 or later (can call Boot directly).
+ *
+ * @author <a href="mailto:[email protected]">Jon A. Maxwell (JAM)</a> - initial author
+ * @version $Revision: 1.5 $
+ */
+public class Boot13 extends URLClassLoader {
+
+ // The problem with setting a Policy in jdk1.3 is that the
+ // system and application classes seem to be loaded in such a
+ // way that only their protection domain determines the
+ // permissions; the policy object is never asked for permissions
+ // after the class is loaded. This hack creates a classloader
+ // that loads duplicate versions of the classes in such a
+ // manner where they ask with the policy object. The jdk1.4
+ // correctly honors the Policy object making this unneccessary
+ // post-1.3.
+
+ private Boot13(URL source[]) {
+ super(source);
+ }
+
+ protected PermissionCollection getPermissions(CodeSource source) {
+ Permissions result = new Permissions();
+ result.add( new AllPermission() );
+
+ return result;
+ }
+
+ public Class loadClass(String name) throws ClassNotFoundException {
+ Class c = findLoadedClass(name);
+ if (c != null)
+ return c;
+
+ // reverse the search order so that classes from this
+ // classloader, which sets the right permissions, are found
+ // before the parent classloader which has the same classes
+ // but the wrong permissions.
+ try {
+ return findClass(name);
+ }
+ catch (ClassNotFoundException ex) {
+ }
+
+ return getParent().loadClass(name);
+ }
+
+ public static void main(final String args[]) throws Exception {
+ URL cs = Boot13.class.getProtectionDomain().getCodeSource().getLocation();
+ // instead of using a custom loadClass search order, we could
+ // put the classes in a boot/ subdir of the JAR and load
+ // them from there. This would be an improvement by not
+ // allowing applications to get a duplicate jnlp engine (one
+ // with applet access permissions) by using the system
+ // classloader but a drawback by not allowing Boot to be
+ // called directly.
+ //cs = new URL("jar:"+cs+"!/boot/");
+
+ if (cs == null) {
+ System.err.println("fatal: cannot determine code source.");
+ System.exit(1);
+ }
+
+ Boot13 b = new Boot13(new URL[] {cs});
+
+ Thread.currentThread().setContextClassLoader(b); // try to prevent getting the non-policy version of classes
+
+ Class c = b.loadClass("net.sourceforge.jnlp.runtime.Boot");
+ Method main = c.getDeclaredMethod("main", new Class[] {String[].class} );
+
+ main.invoke(null, new Object[] { args } );
+ }
+
+}