Lecture 7 - Conversions and Validations

Question 1

What happens during request values phase?

Answer 1

Submitting a form will create a request value that is stored into the components.

Question 2

What happens during the Process Validation phase?

Answer 2

Conversion attempts to cast submitted value to desired local value.

Local values validated.

Question 3

What types do standard converters work with?

Answer 3

primitive, enum, BigInteger/BigDecimal

Question 4

What is <f:convertNumber>?</f:convertNumber>

Answer 4

converts input into a type: number, currency or percent.

Can follow a formatting pattern=””

Question 5

What is <f:convertDateTime>?</f:convertDateTime>

Answer 5

converts to type: date, time, localDate, localTime…

Can follow a formatting pattern=””

Question 6

What is a converter attribute?

Answer 6

An alternative to having a <f:convertNumber> tag for example in the body.</f:convertNumber>

You can add the attribute converter=”javax.faces.DateTime” for example to an input tag

Question 7

What happens during conversion errors?

Answer 7

Component declares itself invalid

JSF redisplays page with error messages using <h:message></h:message>

Question 8

How are error messages displayed?

Answer 8

Using <h:message> or <h:messages> tag</h:messages></h:message>

Note: In JSF 2.0 <h:messages></h:messages> tag is
automatically added if project stage set to
Development

Question 9

How do you change standard conversion error messages?

Answer 9

<message-bundle>com.corejsf.messages</message-bundle>

Question 10

How is validation done?

Answer 10

Add validator component or method to a tag (custom validation).

Question 11

What does immediate=”true” do in terms of validation?

Answer 11

Moves the process validations phase to occur in the apply request values phase.

Basically used to bypass validation, can be used with cancel commandButtons for example.

Question 12

How is bean validation performed?

Answer 12

Add annotations to setters/getters

Question 13

How are custom bean validators created?

Answer 13

@Constraint (validator class)

validator class implements ConstraintValidator

Question 14

Changing bean validation default messages

Answer 14

Define ValidationMessages.properties in root package

Question 15

What interface to implement for custom converter classes?

Answer 15

implement javax.faces.convert.Converter

Annotate with @FacesConverter(“converter id”)

Question 16

What interface to implement for a custom validator class?

Answer 16

javax.faces.validator.Validator

Question 17

How do we validate with bean methods?

Answer 17

Use the validator=”” attribute