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diff --git a/libjava/gnu/java/lang/MainThread.java b/libjava/gnu/java/lang/MainThread.java
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+/* gnu.java.lang.MainThread
+   Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
+   2006, 2008 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+ 
+GNU Classpath 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
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+
+package gnu.java.lang;
+
+import java.io.File;
+import java.util.jar.Attributes;
+import java.util.jar.JarFile;
+
+/**
+ * MainThread is a Thread which uses the main() method of some class.
+ *
+ * @author John Keiser
+ * @author Tom Tromey (tromey@redhat.com)
+ */
+final class MainThread extends Thread
+{
+  // If the user links statically then we need to ensure that these
+  // classes are linked in.  Otherwise bootstrapping fails.  These
+  // classes are only referred to via Class.forName(), so we add an
+  // explicit mention of them here.
+  static final Class Kcert     = java.security.cert.Certificate.class;
+  static final Class Kfile     = gnu.java.net.protocol.file.Handler.class;
+  static final Class Khttp     = gnu.java.net.protocol.http.Handler.class;
+  static final Class Kjar      = gnu.java.net.protocol.jar.Handler.class;
+
+  // Private data.
+  private Class klass;
+  private String klass_name;
+  private String[] args;
+  private boolean is_jar;
+
+  public MainThread(Class k, String[] args)
+  {
+    super(null, null, "main");
+    klass = k;
+    this.args = args;
+  }
+
+  public MainThread(String classname, String[] args, boolean is_jar)
+  {
+    super (null, null, "main");
+    klass_name = classname;
+    this.args = args;
+    this.is_jar = is_jar;
+  }
+
+  public void run()
+  {
+    if (is_jar)
+      klass_name = getMain(klass_name);
+
+    if (klass == null)
+      {
+        try
+	  {
+            ClassLoader cl = ClassLoader.getSystemClassLoader();
+	    // Permit main class name to be specified in file-system format.
+	    klass_name = klass_name.replace(File.separatorChar, '.');
+            klass = cl.loadClass(klass_name);
+	  }
+	catch (ClassNotFoundException x)
+	  {
+	    NoClassDefFoundError ncdfe = new NoClassDefFoundError(klass_name);
+	    ncdfe.initCause(x);
+	    throw ncdfe;
+	  }
+      }
+
+    call_main();
+  }
+
+  private String getMain(String name)
+  {
+    String mainName = null;
+    try
+      {
+	JarFile j = new JarFile(name);
+	Attributes a = j.getManifest().getMainAttributes();
+	mainName = a.getValue(Attributes.Name.MAIN_CLASS);
+      }
+    catch (Exception e)
+      {
+	// Ignore.
+      }
+
+    if (mainName == null)
+      {
+	System.err.println("Failed to load Main-Class manifest attribute from "
+			   + name);
+	System.exit(1);
+      }
+    return mainName;
+  }
+
+  // Note: this function name is known to the stack tracing code.
+  // You shouldn't change this without also updating stacktrace.cc.
+  private native void call_main();
+}