9Implementing Constraint Validation in a Java EE Web App
The minimal web app that we have discussed in Part 1 has been limited to support the minimum functionality of a data management app only. For instance, it did not take care of preventing the user from entering invalid data into the app’s database. In this chapter, we show how to express integrity constraints in a Java EE entity class, and how to have constraints automatically validated on critical life cycle events of entity objects with JPA, and on form submission with JSF.
9.1Java Annotations for Persistent Data Management and Constraint Validation
The integrity constraints of a distributed app have to be checked both in model classes and in the underlying database, and possibly also ...
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