--- a/langtools/src/share/classes/com/sun/tools/javac/nio/JavacPathFileManager.java	Tue Dec 14 14:17:20 2010 -0800
+++ b/langtools/src/share/classes/com/sun/tools/javac/nio/JavacPathFileManager.java	Wed Dec 15 06:39:51 2010 -0800
@@ -376,7 +376,8 @@
                 new SimpleFileVisitor<Path>() {
             @Override
             public FileVisitResult preVisitDirectory(Path dir, BasicFileAttributes attrs) {
-                if (SourceVersion.isIdentifier(dir.getName().toString())) // JSR 292?
+                Path name = dir.getName();
+                if (name == null || SourceVersion.isIdentifier(name.toString())) // JSR 292?
                     return FileVisitResult.CONTINUE;
                 else
                     return FileVisitResult.SKIP_SUBTREE;