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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.net.*;
import java.security.*;
/**
* 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:jmaxwell@users.sourceforge.net">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 });
}
}
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