[flexcoders] How does Flex Builder validate a BlazeDS/LCDS J2EE project?

[Michael Slinn]

I imagined that Flex Builder validates a J2EE project by writing a
file into the root folder, and reading it back via the root URL, but
when I used SysInternals FileMon and a TCP monitor to check, I did not
see any such activity.  Exactly how does the Validate Configuration
button perform validation?