JSF <f:validateRequired> Tag
It is used to ensure that the local value is not empty on an EditableValueHolder component.
||It is used to bind a ValueExpression that evaluates to an instance of RequiredValidator.
||This attribute is used to refers to the value of one of the exposed attached objects within the composite component inside of which this tag is nested.
||It is a unique component identifier.
||It is used to represent CSS class.
JSF <f:validateRequired> Tag Example