It can be a real pain finding out what version of Apache, Java, Oracle forms etc E-Business Suite R12 is using. You can do it by hand but here’s a quicker way – with a handy script that Oracle provide. You can get it from My Oracle Support by searching for article ID 468311.1.
NB: You’ll still need to cross-reference the versions of forms and apps you find with the expected versions on My Oracle Support by looking at the readmes and what-not for each patch and/or patchset.
Still beats doing it all by hand though.