Why is Java so popular

The introductory programming course at uni teaches Java, but you don't have to take it if you know a programming language. Should I teach myself python over the summer (I already know the basics) and avoid having to learn Java? Or are the haters just people who are scared of object orientation.

>>24
Too bad Microsoft has it on a short leash. They're only allowing Mono to exist because it's good publicity for them. I don't expect them to hesitate even for a second to change their step once they deem it financially suitable to pull the plug.