springmvc异常：java.lang.IllegalArgumentException: Unknown return value type: java.lang.Boolean

springmvc控制器返回时异常：java.lang.IllegalArgumentException: Unknown return value type: java.lang.Boolean

错误写法：

@RequestMapping("/isLogin")
@ResponseBody
public boolean isLogin(HttpServletRequest request, HttpServletResponse response) {  
  return false;
}

正确的写法：加@ResponseBody
@RequestMapping("/isLogin")
@ResponseBody
public boolean isLogin(HttpServletRequest request, HttpServletResponse response) {  
  return false;
}
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