Practical JSF in Java EE 8: Web Applications ​in Java for the Enterprise

© Michael Müller 2018

Michael MüllerPractical JSF in Java EE 8 https://doi.org/10.1007/978-1-4842-3030-5_25

25. Validation

Michael Müller¹ 

(1)

Brühl, Nordrhein-Westfalen, Germany

 

Before JSF transfers data into the model, the raw data has to be converted and validated. A short overview of bean validation was given in Chapter 15. As stated there, JSF offers its own validation specification besides bean validation. Although bean validation is the newer technique, it’s not a replacement for the older JSF validation—sometimes it’s very handy to use this “old” validation.

This chapter covers different kinds of validation.

Bean Validation

Bean validation uses special constraints that are applied to the fields or accessors by annotations. Some of these ...