Java 弹簧：参数条件“；“loanTitle”；未满足实际请求参数的要求

JavaSpringMVC。没有参数我无法打开url。我在网上找到了一些建议（，），但它们对我没有帮助

@Controller
@RequestMapping("/loans/")
public class LoanController {

    @Autowired 
    LoanDAO loanDAO;

    @GetMapping(value= "objectloan", params = {"loanTitle"})
    public String index(Model theModel, HttpSession session, @RequestParam(value = "loanTitle", required = false, defaultValue = "") Optional<String> loanTitle)
    {
....
    }

---

由于查询url中可能不存在

loanTitle

，请尝试删除控制器方法中的

params={“loanTitle”}

    @GetMapping(value= "objectloan")
    public String index(Model theModel, HttpSession session, @RequestParam(value = "loanTitle", required = false, defaultValue = "") Optional<String> loanTitle)
    {
....
    }

@GetMapping（value=“objectloan”）
公共字符串索引（模型，HttpSession会话，@RequestParam（value=“loanTitle”，required=false，defaultValue=“”）可选loanTitle）
{
....
}

尝试定义@GetMapping（value=“objectloan”）

    @GetMapping(value= "objectloan")
    public String index(Model theModel, HttpSession session, @RequestParam(value = "loanTitle", required = false, defaultValue = "") Optional<String> loanTitle)
    {
....
    }