sun-web.xml is a specific configuration file for GlassFish. For example, things like context-root is defined in sun-web.xml because there is no way you can define it in web.xml.
SCJP 5.0, SCWCD 1.4, SCBCD 1.3, SCDJWS 1.4
My Blog
Don't get me started about those stupid light bulbs.