HCFS: fix mkdirs NPE

other/java/client/src/main/java/seaweedfs/client/FilerClient.java

@@ -34,13 +34,12 @@ public class FilerClient {
 
     public boolean mkdirs(String path, int mode, int uid, int gid, String userName, String[] groupNames) {
 
-        Path pathObject = Paths.get(path);
-        String parent = pathObject.getParent().toString();
-        String name = pathObject.getFileName().toString();
-
         if ("/".equals(path)) {
             return true;
         }
+        Path pathObject = Paths.get(path);
+        String parent = pathObject.getParent().toString();
+        String name = pathObject.getFileName().toString();
 
         mkdirs(parent, mode, uid, gid, userName, groupNames);
 

other/java/client/src/test/java/seaweedfs/client/SeaweedFilerTest.java

@@ -13,5 +13,11 @@ public class SeaweedFilerTest {
             System.out.println(entry.toString());
         }
 
+        filerClient.mkdirs("/new_folder", 0755);
+        filerClient.touch("/new_folder/new_empty_file", 0755);
+        filerClient.touch("/new_folder/new_empty_file2", 0755);
+        filerClient.rm("/new_folder/new_empty_file", false);
+        filerClient.rm("/new_folder", true);
+
     }
 }