Is it necessary to invoke setValid(true) in decode() in a JSF Custom Component?

问题

While working with a custom component I have the problem, that UIInput#getValid() never resets itself. Question is: do I have to invoke setValid(true) myself during Apply Request Values Phase?

Here are the steps I have done:

• Create a custom component and inherit from UIInput
• The component invokes setConverter in the constructor
• The converter was designed for this component alone and throws a ConverterException if it can't convert from String to the model object
• There are no validators
• decode() is overriden, and if FacesContext#isPostback returns true we invoke setSubmittedValue with the request value
• During render response I check isValid(), it returns true if a ConverterException was thrown, and I can render the response accordingly
• But: If I submit another correct value the setValid(true) is never called for the custom component

回答1:

The default implementation of UIInput#decode() indeed calls EditableValueHolder#setValid() with true.

So you have 2 options:

• Simply invoke super.decode(context) in your UIInput#decode() instead of manually grabbing submitted value and invoking setSubmittedValue() with it (because that's already the default behavior of UIInput#decode()).
• Or, manually invoke setValid(true) in your UIInput#decode() before invoking setSubimttedValue().

来源：https://stackoverflow.com/questions/63068399/is-it-necessary-to-invoke-setvalidtrue-in-decode-in-a-jsf-custom-component