webflow.xsd - Start state is missing. Add at least one state to the flow

问题

I am working with Spring Core 4.0.7 and Spring Web Flow 2.4.0

Using Spring Tool Suite I am able to create a Spring Web Flow Definition File

For the <flow> tag it generates

<?xml version="1.0" encoding="UTF-8"?>
<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">

Observe spring-webflow-2.0.xsd

When I try to use the validation-hints attribute how the following:

<view-state id="registrar" 
            view="deportista.flow.formulario.registro"
            model="deportista"
            validation-hints="'….someValue'" >

The editor put an underline red. So the attribute is wrong or is not valid.

I did realize that If I change:

from

• spring-webflow-2.0.xsd

to

• spring-webflow.xsd (-2.0 has been removed)

It is recognized and goes well until I build the application.. In the left part of the <flow> tag appears a red circle with a x. If I see the message it says:

Start state is missing. Add at least one state to the flow

Funny because I have in the beginning

<on-start>
    <evaluate expression="deportistaAction.createDeportista()" 
              result-type="com.manuel.jordan.domain.Deportista" 
              result="flowScope.deportista"/>
</on-start>

<view-state id="registrar" 
            view="deportista.flow.formulario.registro"
            model="deportista"
            validation-hints="'…someValue'" 
            >

Even with that error, the flow process works fine. I mean, the error appears only in the <flow> definition but when the flow is executed all work fine, practically how if the error never has been generated.

What is wrong? I did a research through Google, and it has been reported how a kind of old bug time ago and it has been already fixed. So wondered why this situation appears again.

来源：https://stackoverflow.com/questions/26222008/webflow-xsd-start-state-is-missing-add-at-least-one-state-to-the-flow