Java SpringWebFlow-无法对模型bean调用注释验证

请参阅下面的代码片段。我的流程从显示一个包含3个字段的简单JSP开始。当我提交表单时，我希望通过表单bean上的注释配置的验证JSR-303能够启动并显示错误消息。但事实并非如此。页面将被提交到searchActions.findExistingPlayer方法。任何指示都会有帮助

配置文件：

<?xml version="1.0" encoding="UTF-8"?>
<!-- Source project: sip05, branch: 03 (Maven Project) -->

<flow xmlns="http://www.springframework.org/schema/webflow"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="
    http://www.springframework.org/schema/webflow
    http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd"
    start-state="findExistingPlayerForm">

    <view-state id="findExistingPlayerForm">
        <on-render>
            <evaluate expression="findExistingPlayerFormAction.setupForm"></evaluate>
        </on-render>
        <transition on="find" to="findExistingPlayerFormActionState">
            <evaluate expression="findExistingPlayerFormAction.bindAndValidate"></evaluate>
        </transition>
    </view-state>

    <action-state id="findExistingPlayerFormActionState">
        <evaluate expression="searchActions.findExistingPlayer"></evaluate>
        <transition on="success" to="displayFindExistingPlayerResult"></transition>
    </action-state>
    <view-state id="displayFindExistingPlayerResult">
        <<---Some transitions-->>>
    </view-state>
    <end-state id="newSearchEndState" />

</flow>

Web流上下文：

<flow:flow-builder-services id="flowBuilderServices"
        development="true" 
        validator="validator"/>
<beans:bean id="validator" class="org.springframework.validation.beanvalidation.LocalValidatorFactoryBean"/>

Flow.xml

<var name="playerSearchForm" class="com.saurabhd.springwebflow.form.PlayerSearchForm"/>

    <view-state id="findExistingPlayerForm" model="playerSearchForm">
        <transition on="find" to="findExistingPlayerFormActionState">
        </transition>
    </view-state>

---

我注意到您没有在视图状态上正确定义模型。定义模型时，必须将正在使用的模型的实例设置为流范围或视图范围

您正在做的是在流中创建PlayerSearchForm的新实例，并绑定到视图状态。这不起作用，因为您必须绑定正在视图上工作的实例

因此，有两种方法可以传递对象的引用

第一种方式：

//You can set objects into the flow scope, like this. 
RequestContextHolder.getRequestContext().getFlowScope().put("playerSearchForm", instanceOfPlayerSearchForm);

第二种方式：

<evaluate expression="findExistingPlayerFormAction.getPlayerSearchForm()" result="flowScope.playerSearchForm"/>


public PlayerSearchForm getPlayerSearchForm(){
   return instanceOfPlayerSearchForm;
}

---

伙计们，有人能在这里帮忙并提供建议吗？@Willieweeler，你们能在这里帮忙吗。

public void validateFindExistingPlayerForm(ValidationContext context){
        MessageContext messages = context.getMessageContext();
        if(StringUtils.isEmpty(firstName)){
            messages.addMessage(new MessageBuilder().error().source("firstName").
                    defaultText("Please enter the value for First Name.").build());
        }
    }

<var name="playerSearchForm" class="com.saurabhd.springwebflow.form.PlayerSearchForm"/>

    <view-state id="findExistingPlayerForm" model="playerSearchForm">
        <transition on="find" to="findExistingPlayerFormActionState">
        </transition>
    </view-state>

//You can set objects into the flow scope, like this. 
RequestContextHolder.getRequestContext().getFlowScope().put("playerSearchForm", instanceOfPlayerSearchForm);

<evaluate expression="findExistingPlayerFormAction.getPlayerSearchForm()" result="flowScope.playerSearchForm"/>


public PlayerSearchForm getPlayerSearchForm(){
   return instanceOfPlayerSearchForm;
}