java.lang.IllegalStateException:BindingResult和bean名称' subscription'的普通目标对象都没有。可用作请求属性

时间:2014-04-03 12:43:08

标签: java spring thymeleaf

我开始使用百里香。

我正在关注此页:Spring MVC view layer: Thymeleaf vs. JSP

我上课了:

public class MyMainObject {
    private String a;
    private String b;
    private String c;
    private String d;
    private String e;

// getters and setters
}

我也有一个控制器:

@Controller
public class MyMainObjectController extends AbstractController 
    @RequestMapping({"/subscribeth"})
    public String getObj(final MyMainObject subscription) {
        return "subscribeth";
    }
}

这是我的HTML代码:

<form action="#" th:object="${subscription}" th:action="@{/subscribeth}">
    <fieldset>
        <div>
            <label for="a" th:text="#{subscription.a}">a:
            </label> <input type="text" th:field="*{a}" />
        </div>
        <div>
            <label for="b" th:text="#{subscription.b}">b:
            </label> <input type="text" th:field="*{b}" />
        </div>
        <div>
            <label for="c" th:text="#{subscription.c}">c: </label>
            <input type="text" th:field="*{c}" />
        </div>
        <div>
            <label for="d" th:text="#{subscription.d}">d:
            </label> <input type="text" th:field="*{d}" />
        </div>
        <div>
            <label for="e" th:text="#{subscription.e}">e:
            </label> <input type="text" th:field="*{e}" />
        </div>
        <div class="submit">
            <button type="submit" name="save" th:text="#{subscription.submit}">Subscribe me!</button>
        </div>
    </fieldset>
</form>

当我运行mu应用程序时出现错误:

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring3.processor.attr.SpringInputGeneralFieldAttrProcessor'
org.thymeleaf.exceptions.TemplateProcessingException: Error during execution of processor 'org.thymeleaf.spring3.processor.attr.SpringInputGeneralFieldAttrProcessor'
java.lang.IllegalStateException: Neither BindingResult nor plain target object for bean name 'subscription' available as request attribute

看起来,我必须创建bean subscription

这是我的问题,我该怎么做?我从之前提到的教程中下载了源代码,但是找不到它。

提前谢谢

2 个答案:

答案 0 :(得分:3)

使用@ModelAttribute("subscription")注释控制器处理程序方法的参数。默认情况下,如果没有给定值,Spring将根据参数的类型生成属性名称。因此MyMainObject将成为myMainObject

答案 1 :(得分:2)

我是初学者,当我遇到这个问题时,通过添加model.addAttribute(&#34; modelname&#34;,new modelObj())解决了这个问题。在返回视图名称之前,例如:

@RequestMapping(value="/login", method=RequestMethod.GET)
public String showLogin(Model model, HttpSession session)
{
    model.addAttribute("userForm", new UserForm());
    return "users";
}