I think he misses THE biggest obstacle. All these youngsters had been told for years that they are being taught the end of all languages, the one and only language they are ever gonna need ... and now, two weeks into their work life they are forced to learn another language and next to nothing they learned holds. You are hurting their pride. [Jenda's reply]

I think that's exactly what Sam says in the article.

Right out of the gate, there's an unavoidable culture shock which comes from learning Java and then learning Perl.

[…]

It's like being a child: When you're at the very beginning of your life, and you've seen very little of the world of software engineering, the few things that you have seen fill your whole mind up and heavily colour all of your future experiences.

There's even the fact that - shockingly - Java isn't the number one all-purpose solution to all conceivable problems.