# A good IDE, like Eclipse for Java.
An IDE like Eclipse, which relies on static analysis is never going to be good enough for a language as dynamically typed as perl. Perl is just not that kind of language. The syntax is a relatively minor issue (and that's probably saying something).
The only reason it works on Java at all, is because Java seems to be designed from the ground up to have the programmer make extra-double-carefully clear what (s)he expects some object to be and do anywhere that object is used (or even just glanced at).
# Good multi-threading.
Perl's multi-threading is still under development. IMO it's mostly useful because it enables you to use native multi-threaded libraries. I agree it can be a pain to use, though. In any case, threads aren't needed to build GUIs. You can build a perfectly good GUI system using just callbacks/events for instance.
# Standard and rich GUI.
Show me one portable language that has a good modern looking, standard GUI. Tcl/Tk, maybe. Java definitely does not have one.
Note that even Eclipse does not use the "Standard and rich" Java GUI, because it's too damn slow and ugly.
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