0

我有以下文件：

webflow-context.xml

...
<bean id="user" class="com.bla-bla.datamodel.User" scope="prototype" />
...

用户.java

public class User implements Serializable {
    private static final long serialVersionUID = 1L;
    private Integer id;
    private String name;
    private Address address = new Address();
    //setters and getters
}

addUser.jspx

...
<form:form commandName="user">
        <form:hidden path="id" />
                    <form:input path="name"/>
                    <form:input path="address.street"/>
          <div class="Buttons">
            <div class="Button">
                <button type="submit" name="_eventId_cancelUser">
                    <fmt:message key="button.cancel" />
                </button>
                <button type="submit" name="_eventId_userNext">
                    <fmt:message key="button.next" />
                </button>
            </div>
        </div>
</form:form>
...

添加用户.xml

    <on-start>
        <set name="flowScope.user" value="user" />
    </on-start>

    <view-state id="addUser" view="addUser">
        <transition on="cancelUser" to="cancelUser"/>
        <transition on="userNext" to="userNext">
            <set name="user.name" value="requestParameters.name"/>
            <set name="user.address.street" value="requestParameters.address.street"/>
        </transition>
    </view-state>
...

问题是工作正常但有错误：

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.webflow.execution.ActionExecutionException: Exception thrown executing [AnnotatedAction@741dbf43 targetAction = [SetAction@4cf80343 name = user.address.street, value = requestParameters.address.street], attributes = map[[empty]]] in state ' addUser ' of flow ' addUser ' -- action execution attributes were 'map[[empty]]'
org.springframework.webflow.execution.ActionExecutionException: Exception thrown executing [AnnotatedAction@741dbf43 targetAction = [SetAction@4cf80343 name = user.address.street, value = requestParameters.address.street], attributes = map[[empty]]] in state ' addUser ' of flow ' addUser ' -- action execution attributes were 'map[[empty]]'
org.springframework.binding.expression.EvaluationException: An ELException occurred getting the value for expression 'requestParameters.address.street' on context [class org.springframework.webflow.engine.impl.RequestControlContextImpl]
org.springframework.expression.spel.SpelEvaluationException: EL1007E:(pos 0): Field or property 'street' cannot be found on null

如果字段 «User» 是一个对象，我会收到错误消息。我的工作只是获取页面上输入的数据并将其保存在 bean 用户 (flowScope.user) 中，这将是处理它们的最后一步。

怎么做才对？

UPD：我发现了我的问题，即使在<form:input path="address.street"/>地址 = NULL 之后。但为什么？

4

1 回答 1

0

我认为问题出在这里：value="requestParameters.address.street"

requestParameters只能包含字符串，并且您期望该类型的对象Address

只需在您的网址中像这样通过您的街道...&name=foo&street=bar...并将其接收为requestParameters.street

于 2013-08-22T20:59:02.363 回答