Improved compatibility with the Java 7 FileSystem abstraction.

h2/src/main/org/h2/store/fs/FileUtils.java

@@ -292,12 +292,12 @@ public class FileUtils {
      * @param dir the directory name
      */
     public static void createDirectories(String dir) {
+        if (dir != null && !FileUtils.exists(dir)) {
             String parent = FileUtils.getParent(dir);
-        if (parent != null && !FileUtils.exists(parent)) {
             createDirectories(parent);
-        }
             createDirectory(dir);
         }
+    }
 
     /**
      * Copy a file from one directory to another, or to another file.