Book stores stock books that they think they can sell. More people are buying Java books. There are many reasons for this, and not all of them are positives for Java. The bottom line though is that Java is currently a more popular language in the world at large, and if you're going to get upset every time you see evidence of that you're in for a rough ride.
If your complaint is that the Perl books look too practical and not fun enough (does "Enterprise Business Solutions with Java" sound fun?), then I'd say you're missing a major point in the Perl culture. Perl is about results, not about buzzwords. It isn't cool and it doesn't care. (By the way, there are books on graphics programming and web services with Perl coming out soon from O'Reilly.)