About Eric Jansson

Eric Jansson is Assistant Director of Systems and Development for the ACS Technology Center, a regional center supporting the development and use of technology in higher education. His work has focused on commercial and open-source application development in the field of secondary and post-secondary education.
Unheralded Java Filters Simplify Web-app Testing

Java filters, first introduced in the Java Servlet specification 2.3, are a powerful addition to any Java Web application toolkit, yet they probably are the most under-used and under-appreciated of the servlet components. These classes intercept requests coming into and responses coming out of the Java servlet container, allowing developers to inspect and manipulate these messages, as well as take other actions based on the messages’ content. Despite this useful functionality, many Java developers are unfamiliar with filters.