--- a/src/share/classes/com/sun/security/auth/login/ConfigFile.java	Fri Apr 18 15:23:27 2008 +0200
+++ b/src/share/classes/com/sun/security/auth/login/ConfigFile.java	Wed Apr 23 08:10:28 2008 +0800
@@ -620,14 +620,34 @@
      * start up time noticeably for the new launcher. -- DAC
      */
     private InputStream getInputStream(URL url) throws IOException {
-        if ("file".equals(url.getProtocol())) {
+        if ("file".equalsIgnoreCase(url.getProtocol())) {
+            // Compatibility notes:
+            //
+            // Code changed from
+            //   String path = url.getFile().replace('/', File.separatorChar);
+            //   return new FileInputStream(path);
+            //
+            // The original implementation would search for "/tmp/a%20b"
+            // when url is "file:///tmp/a%20b". This is incorrect. The
+            // current codes fix this bug and searches for "/tmp/a b".
+            // For compatibility reasons, when the file "/tmp/a b" does
+            // not exist, the file named "/tmp/a%20b" will be tried.
+            //
+            // This also means that if both file exists, the behavior of
+            // this method is changed, and the current codes choose the
+            // correct one.
             try {
-                File path = new File(url.toURI());
-                return new FileInputStream(path);
-            } catch (IOException ioe) {
-                throw ioe;
-            } catch (Exception ex) {
-                throw new IOException(ex.getMessage(), ex);
+                return url.openStream();
+            } catch (Exception e) {
+                String file = url.getPath();
+                if (url.getHost().length() > 0) {  // For Windows UNC
+                    file = "//" + url.getHost() + file;
+                }
+                if (debugConfig != null) {
+                    debugConfig.println("cannot read " + url +
+                            ", try " + file);
+                }
+                return new FileInputStream(file);
             }
         } else {
             return url.openStream();

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/com/sun/security/auth/login/ConfigFile/IllegalURL.java	Wed Apr 23 08:10:28 2008 +0800
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code 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
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+/*
+ * @test
+ * @bug 6689000
+ * @summary Changes in 6675606 causing regression test failures on windows-i586
+ */
+
+import com.sun.security.auth.login.*;
+import java.io.*;
+import java.net.URL;
+
+public class IllegalURL {
+    public static void main(String[] args) throws Exception {
+        FileOutputStream fos = new FileOutputStream("x.conf");
+        fos.close();
+        use("file:" + System.getProperty("user.dir") + "/x.conf");
+        use("file:x.conf");
+        System.out.println("Test passed");
+    }
+
+    static void use(String f) throws Exception {
+        System.out.println("Testing " + f  + "...");
+        System.setProperty("java.security.auth.login.config", f);
+        try {
+            new FileInputStream(new URL(f).getFile().replace('/', File.separatorChar));
+        } catch (Exception e) {
+            System.out.println("Even old implementation does not support it. Ignored.");
+            return;
+        }
+        new ConfigFile();
+    }
+}