Não sei o que deu em mim, mas me bateu uma vontade incontrolável de procurar piadas sobre Java na internet. E achei umas legais!

Lá vão as melhores dessa página:

Session Bean walks into a bar and asks for a Jack Daniels on the rocks…bartender says “I’m afraid I can’t serve you any alcohol”, and the Session Bean says, “why not ? Are you discriminating against Session Beans ?” and the bartender replies “well, look at the state you’re in”.

Two session beans in love are sitting cuddled close together:
“Oh Jarling, my Singleton!”, the female session bean exclaims.
“Let’s go Home and Make love.”, the male session bean replies.
“But we can’t”, the female session bean says. “I don’t want to create() new() instances.”
“Don’t worry” the male session bean replies with a smile. “My constructor is protected.”

The producers of the movie Highlander have realized that the title really should have been: “Singleton”.

Q - How many Java programmers does it take to screw in lightbulb?
A - Eight! One to screw in the lightbulb and seven to debate the optimum wattage, which shape of lightbulb gives more light, who is the best lightbulb vendor, whether we should have an open source lightbulb, and which lightbulb performs better on the EIPerf (Enterprise Illumination Performance) benchmark!

Agora, a melhor de todas… além de ser a mais pura verdade