I've attached a stripped down application that produces a memory leak. This application was built using NetBeans 6.9.1; I believed I made the app with "New Project > Maven > Maven Web Application" and then used "New > Web Services > Web Service from WSDL".
If I remove the beans.xml file from the project the memory leak goes away.
I was able to observe the leak in the stock GlassFish 3.0.1 download with default dev settings as well as with the attached domain.xml which has been modified for other purposes.
Sun JDK 1.6.0_23