Unfortunately, JSP and Servlets are not supported. However ASP, ASP.Net, Cold Fusion MX, Perl and PHP are all supported.
You can also use Java Applets.
An applet is a program written in the Java programming language that can be included in an HTML page, much in the same way an image is included. When you use a Java technology-enabled browser to view a page that contains an applet, the applet's code is transferred to your system and executed by the browser's Java Virtual Machine (JVM).