Imported GNU Classpath 0.20

Imported GNU Classpath 0.20
       * Makefile.am (AM_CPPFLAGS): Add classpath/include.
       * java/nio/charset/spi/CharsetProvider.java: New override file.
       * java/security/Security.java: Likewise.
       * sources.am: Regenerated.
       * Makefile.in: Likewise.

From-SVN: r109831

libjava/classpath/java/io/File.java

@@ -396,7 +396,8 @@ public class File implements Serializable, Comparable
    * This method initializes a new <code>File</code> object to represent
    * a file corresponding to the specified <code>file:</code> protocol URI.
    *
-   * @param uri The uri.
+   * @param uri The URI
+   * @throws IllegalArgumentException if the URI is not hierarchical
    */
   public File(URI uri)
   {
@@ -406,7 +407,11 @@ public class File implements Serializable, Comparable
     if (!uri.getScheme().equals("file"))
 	throw new IllegalArgumentException("invalid uri protocol");
 
-    path = normalizePath(uri.getPath());
+    String name = uri.getPath();
+    if (name == null)
+      throw new IllegalArgumentException("URI \"" + uri
+                     + "\" is not hierarchical");
+    path = normalizePath(name);
   }
 
   /**