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Required steps for using ExtVal:

Download the required ExtVal jar-files or checkout the Source Code and build it. (details)
Add these jar-files to your classpath (manually or via maven)
Use the annotations (details)

That's it!

Simple validation

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Add myfaces-extval-core-.jar and myfaces-extval-property-validation-.jar to the classpath
Use JPA annotations within the model (e.g.: @Column(nullable = false) -> the field is required)

That's it!
The table below gives an overview of the validations that are generated, based on JPA annotations.

JPA Annotation	Generated validation
`@Column`	Field will be required if `nullable == false`. If the field is a `String` and the `columns` property is set on the `@Column` annotation, the maximum length of the `String` will be validated accordingly.
`@Basic`	Field will be required if `optional == false`.
`@OneToOne`	Field will be required if `optional == false`.
`@ManyToOne`	Field will be required if `optional == false`.
`@Id`	Field will be required.

(A simple demo is available here: demo_000)

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Since both modules support the same syntax you will find further information here.