Why is it either Perl or Java? Why not both?

I worked as a freelancer for a big bank here in Germany in 2003. The department I worked for specialized in Perl because the development cycles are much shorter than with Java

Now I'm an employee in a company that focusses on Java. But guess what: More than 50% of the tasks I have to do are easily solved with Perl! Even for development and testing of algorithms I use Perl.

Personally I found Java extremely hard to learn. You have to know hundreds of thousands of modules really well to just get the easiest tasks done. But that's just my feeling. Each Time I have to do something in Java I have to ask my colleagues for help, or I need one day for a task I solve in an hour in Perl.