[pupeno]

I disagree. Every time I tried to put together an app with any of Common Lisp, Scheme or Smalltalk I found myself fighting idiosyncrasies unrelated to my app. Obviously it can be done, but the advantage of using those languages start to diminish. It's not about popularity, it's about practicality. I found making Java web applications unpractical in a similar way although I haven't tried enough.

[Xurinos]

This is an example of an anecdotal piece of evidence, and without a close examination of the "idiosyncrasies" and your definition of "practical", it is difficult to have a discussion. I recognize, though, that people have different opinions on what language is most familiar/useful to them, and at the end of the day, people get work done and make money, whatever they use.

[pupeno]

Yes, it's only anecdotal, but it's not that someone didn't allow me to use the language because it's name didn't start with "J" and ended with "ava". I tried and failed. Other people had similar experience. There are some things to point out that many people mention as problematic, like Squeak's image.