I can't rightly tell. My employer at the time was several employers ago
and like most of the employers since then, the entire department was disposed of courtesy of Bean Counter Management, so I don't have any legacy code to reference, but I was definitely working with WebLogic by 1999 or earlier, as they liquidated THAT department no later than 2001.
Actually, I tried creating my own JVM using ANTLR back then, so I might be able to find something on my old Amiga disk images.
The secret of how to be miserable is to constantly expect things are going to happen the way that they are "supposed" to happen.
You can have faith, which carries the understanding that you may be disappointed. Then there's being a willfully-blind idiot, which virtually guarantees it.