Category:OWASP Content Validation using Java Annotations Project

The project was initially inspired by the input validation framework Heimdall [1], where the main goal is to provide a clear separation between validation and application logic. This separation was achieved by using an XML configuration file defining which tests were to be run on which object properties.

The first step of our project consisted in checking whether the need for an XML external file could be eliminated by using annotations to associate tests and object properties, instead.

After a new input validation framework based on annotations was succesfully implemented, the focus of the project shifted to investigate how far annotations can be pushed for validation purpouses, while keeping their use as intuitive and simple as possible.

At the moment we defined and implemented:

• composed annotations: which allow the user to compose existing annotations in a boolean fashion to create new tests without the need of writing new code.
• cross annotations: which allow the user to define tests on multiple object properties, rather than just single ones, which have inter-dependent validation constraints.

Other main features that characterize the framework are:

• Easy integration in any esisting Java projects
• High reusability of existing validation tests
• Possibility of creating new custom annotations with little effort

A slide presentation is available here PDF