jfinal 上传文件的相对路径问题

@JFinal 你好，想跟你请教个问题：

下面是jfinal中处理上传文件保存路径的代码片段,

me.setUploadedFileSaveDirectory("file home");

在项目中设置保存文件的相对路径为file home后,得到的路径是如下路径:

D:\aaa\bbb\file home\file home

即有两层file home

请问,将相对路径进行两层封装是出于什么考虑呢?

-------------------补充----------------------

配置:

package studyJfinal;

import model.User;

import com.jfinal.config.*;
import com.jfinal.plugin.activerecord.ActiveRecordPlugin;
import com.jfinal.plugin.c3p0.C3p0Plugin;
import com.jfinal.render.ViewType;

import controller.HelloController;

public class DemoConfig extends JFinalConfig {
	public void configConstant(Constants me) {
		me.setDevMode(true);
		me.setViewType(ViewType.FREE_MARKER);
		me.setUploadedFileSaveDirectory("file home");
	}

	public void configRoute(Routes me) {
		me.add("/hello", HelloController.class);//controller key 默认成为freemarker的模板文件存放路径
	}

	public void configPlugin(Plugins me) {
	}


	public void configInterceptor(Interceptors me) {
	}

	public void configHandler(Handlers me) {
	}
}

controller:

package controller;

import java.io.File;
import java.io.IOException;

import model.User;

import com.jfinal.core.ActionKey;
import com.jfinal.core.Controller;
import com.jfinal.upload.UploadFile;

import freemarker.template.Configuration;

public class HelloController extends Controller {
	public void index() {
		renderText("Hello JFinal World.");
	}
	
	@ActionKey("upload")
	public void upload() {
		UploadFile f = this.getFile();
		long size = f.getFile().length();
		StringBuffer sb = new StringBuffer();
		sb.append("文件长度:").append(size);
		sb.append("\n绝对路径:").append(f.getFile().getAbsolutePath());
		sb.append("\nsavedir:").append(f.getSaveDirectory());
		renderText(sb.toString());
		
	}
	
	@ActionKey("test_upload") 
	public void testUpload() {
		render("upload.html");
	}
	
}