Java 弹簧转换器不被称为

我有一个转换器，但它不叫。我总是有例外

public class IntegerToQueConverter implements Converter<Integer, QuestionType> {

@Autowired
private QuestionTypeService questionTypeService;

@Override
public QuestionType convert(Integer questionType) {

    return questionTypeService.findOne(questionType);
}

---

将

转换器的类型参数更改为
：

public class IntegerToQueConverter implements Converter<String, QuestionType> {

    @Autowired
    private QuestionTypeService questionTypeService;

    @Override
    public QuestionType convert(String questionType) {
        return questionTypeService.findOne(questionType);
    }
}

公共类IntegerToQueConverter实现转换器{
@自动连线
私人问题类型服务问题类型服务；
@凌驾
公共问题类型转换（字符串问题类型）{
返回questionTypeService.findOne（questionType）；
}
}

随请求传入的值将是
String
类型，这要求转换器的类型为
converter
您是否在web应用程序中使用此类型？通常，您可以将字符串转换为特定的对象类型。@KevinBowersox:yes.iam在web应用程序中使用它
    @RequestMapping(value="/insertQuestion", method = RequestMethod.POST)
public ModelAndView insertQuestion(@ModelAttribute("questions") Question question)
{
    ModelAndView view=new ModelAndView("addQuestion");

    System.out.println(question.getQuestion());


            .............................

    return view;
}

public class IntegerToQueConverter implements Converter<String, QuestionType> {

    @Autowired
    private QuestionTypeService questionTypeService;

    @Override
    public QuestionType convert(String questionType) {
        return questionTypeService.findOne(questionType);
    }
}