UIInput#getValue() and getLocalValue() after validation succeeds return different values

问题

Here, it is mentioned by the author.

If it's[COMPONENT] marked valid, then both returns the same value, namely the submitted, converted and validated value.

Consider a very simple snippet:

<h:form>
            <h:inputText value="#{bean.inputValue}" 
                         binding="#{bean.htmlInputText}"      
                         validator="nameValidator" /><br/>
            <h:commandButton value="Submit" action="#{bean.action}" />
</h:form>

with a @RequestScoped backing bean-

public Integer inputValue = 5;
public HtmlInputText htmlInputText;

public void action(){
        System.out.println(" getSubmittedValue() "+htmlInputText.getSubmittedValue());
        System.out.println(" isLocalValueSet() "+ htmlInputText.isLocalValueSet());
        System.out.println(" getValue() " + htmlInputText.getValue());
        System.out.println(" getLocalValue() " +htmlInputText.getLocalValue());
}

On pressing the submit button, output is-

 getSubmittedValue() null    AS EXPECTED, since Conversion & Validation succeded
 isLocalValueSet() false
 getValue() 25               AS EXPECTED, since Conversion & Validation succeded
 getLocalValue() null        Why NULL? IN WHAT CONTEXT HAS THE AUTHOR SAID SO

回答1:

You're checking the local value during invoke application phase.

The local value is cleared out during update model values phase.

The author is talking in context of process validations phase.

---

To clarify, here's the full process:

RESTORE_VIEW

• Restore getSubmittedValue(), isValid(), getLocalValue() and isLocalValueSet() from JSF view state, if any.

APPLY_REQUEST_VALUES

• Do setValid(true) and setSubmittedValue(request.getParameter(getClientId())).

PROCESS_VALIDATIONS

• Convert/validate getSubmittedValue().
  • If valid, do setValue(convertedAndValidatedValue), setLocalValueSet(true), setSubmittedValue(null). Do note that setValue() effectively behaves as setLocalValue().
  • If invalid, do setValid(false) and skip update model values and invoke application phases.

UPDATE_MODEL_VALUES

• If valid and local value set, do bean.setProperty(getLocalValue()) and reset getSubmittedValue(), isValid(), getLocalValue() and isLocalValueSet() to their default values of null, false, null and false.

INVOKE_APPLICATION

• Invoke bean.method().

RENDER_RESPONSE

• If getSubmittedValue() is not null, render it, else if isLocalValueSet() returns true, render getLocalValue(), else render bean.getProperty().
• Save getSubmittedValue(), isValid(), getLocalValue() and isLocalValueSet() in JSF view state, if changed.

来源：https://stackoverflow.com/questions/36907050/uiinputgetvalue-and-getlocalvalue-after-validation-succeeds-return-differen