AJAX响应是从Java不同/休眠返回的字符串

Question

我已经一些问题，这个简单的服务器端方法（爪哇/休眠）：

@RequestMapping(value="/Prova" , method=RequestMethod.POST) 
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) 
public ResponseEntity<String> Prova(
     HttpServletRequest request, HttpServletResponse response 
     ) throws Exception 
{ 

    log.error("Sono qui"); 
    return new ResponseEntity<String>("pippotopolinopaperino",HttpStatus.OK); 

} 

如果客户端不AJAX请求（I使用ExtJs的）的回应是：

pippotopolinopa0015↵ 

为什么？

诗对不起我的英文不好

PPS我也试过用：

@RequestMapping(value="/Prova" , method=RequestMethod.POST) 
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) 
public @ResponseBody String Prova(
     HttpServletRequest request, HttpServletResponse response 
     ) throws Exception 
{ 

    log.error("Sono qui"); 
    return "pippotopolinopaperino"; 

} 

Answer 1

我已经解决了这种方式：

@RequestMapping(value="/Prova" , method=RequestMethod.POST) 
@Transactional(propagation = Propagation.REQUIRED, rollbackFor = Exception.class) 
public @ResponseBody List<String> Prova(
    HttpServletRequest request, HttpServletResponse response 
    ) throws Exception 
{  
    log.error("Sono qui"); 
    List<String> ret = new ArrayList<String>(); 
    ret.add("pippoPlutoTopolino"); 
    return ret;   
} 

或者也：

@RequestMapping(value="/Prova2" , method=RequestMethod.POST) 
@ResponseBody public StringBuffer Prova2(
     HttpServletRequest request 
     ) throws Exception 
{ 
    return new StringBuffer("pippoPlutoTopolino"); 
} 

但我不明白为什么不起作用返回一个简单的字符串。