I have copied the images directory from $ORACLE_HOME/apex/images to /u01/app/glassfish3/glassfish/domains/domain1/docroot/i.Are you sure these are the images that belong to APEX 4.2? If not, this would explain why you see a blank page with "hidden" content in it...
Does the install automatically update the $ORACLE_HOME/apex/images directoryNo. You need to do this manually.
I don't know where I got that patch p14777994_420_Generic.zip.Sounds like a (modified) version of what you get on support.oracle.com ("Metalink"). modified because usually the official patch packages also contain the images, at least if the patch is an upgrade package.
I reinstalled correctly, and this is working now.Great to hear that! Have fun with APEX 4.2 using APEX Listener!