How can I implement validation in JSF?

How can I implement validation in JSF?

You can implement validation in JSF using built-in validators or by creating custom validators. Would you like to know more about either?

What are built-in validators in JSF?

JSF provides several built-in validators like @NotNull, @Size, and @Email. These can be used to validate user input easily.

How do I create a custom validator?

To create a custom validator, implement the Validator interface and override the validate method. You can then register it in your faces-config.xml.

Can you give me an example of a custom validator?

Sure! Here's a simple example: create a class that implements Validator, and in the validate method, check the input against your criteria.