Perhaps one of the things that we haven't done a good job of
advertising is how much testing the GlassFish codebase goes through.
This was certainly a top question at JavaOne 2006, so we've put
together a page that summarizes all of the detailed vetting we did on
GlassFish v1:
https://glassfish.dev.java.net/quality/matrix.html
Let us know what you think!
-- Raj Premkumar
GlassFish quality team