when using redirect in spring mvc its redirecting to null

package org.directi.code.controller;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.codehaus.jackson.JsonParseException;
import org.codehaus.jackson.map.ObjectMapper;
import org.directi.code.Snippet;
import org.directi.code.SnippetDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.servlet.ModelAndView;

@Controller
public class HomeController {

    @Autowired
    SnippetDao snippetDao;
    @RequestMapping(value = "/")
    public String newSnippet(HttpServletResponse response) throws IOException {
     return "new";
    }

    @RequestMapping(value = "/snippets", method = RequestMethod.POST)
    public String createSnippet(@RequestBody String jsonString) throws IOException {
        Snippet snippet = new ObjectMapper().readValue(jsonString, Snippet.class);
       String uuid =  snippetDao.insertData(snippet);
       return "redirect:/snippets/"+uuid;

    }

    @RequestMapping(value="/snippets/{id}", method=RequestMethod.GET)
    public String showSnippet(@PathVariable String id)
    {
        Snippet snippet = snippetDao.getSnippetById(id);
        return "snippet";

    }
}

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