If you've written many full-blown applications in Java, especially ones in which input is accepted from a Web form or a Swing GUI, you've probably spent some time writing validation code -- that ...

Bean Validation (JSR 303), one of the core features of Java Enterprise Edition Version 6 Release, defines a metadata model and an API for entity validation. The default metadata source is ...

Constraining XML by using DTDs or XML Schema is a well-accepted practice. However, using those same mechanisms for constraining Java method arguments is uncharted territory. In this article, Brett ...