[Locke1689]

What are you talking about? libevent invented everything Node.js uses and Python's Twisted had and has everything Node.js could dream of.

Node.js is just a reinvention of old technologies in Javascript.

Edit: Removed flame about Javascript because I don't want to have this debate again.

[kyleburton]

I am talking about the cultures surrounding these languages and frameworks. Node's community rejects blocking libraries. Java's does not. I've used the non-blocking frameworks in Perl (POE and my own), C (select, and some of the poll variants), Ruby (event machine) and they are fine if you can avoid blocking libraries -- in these communities it is generally acceptable to write blocking libraries. I don't see it as a technical hurdle, I see it as a cultural one.

[Locke1689]

You need to start backing up your claims with actual data. What networking libraries are blocking in Node.js that are not blocking in Twisted? Moreover, what can't you do with a Twisted Deferred that you can do in Node.js?

There are two main things that block in computing:

* I/O

* CPU

You better believe that Node blocks on CPU, so what I/O does Node not block on that Twisted does?

[batista]

I am talking about the cultures surrounding these languages and frameworks. Node's community rejects blocking libraries. Java's does not.

So what?

You get tons of Java libs to use, a majority of blocking ones and lots of non blocking on one hand, or you restrict yourself to the fewer non-blocking libs of varying quality available for Node.

With Java you can also turn blocking libs to non blocking with a wrapper and threads, whereas with Node.js if it's blocking you're screwing, because the js engine is single-threaded.

[ricardobeat]

Node is nearing 10k published libraries. Is there a comprehensive site listing Java libraries?

It's trivial to offload blocking operations to other processes in node too, it's just not the preferred option.

[moe]

Node is nearing 10k published libraries.

And ruby has 38237 gems. 99,9% of which are garbage.

Library-count is a terrible metric.

[juiceandjuice]

Have you ever programmed in Java? That's a strange question to ask if you have.

http://mvnrepository.com/

Whatever libraries node has is a drop in the bucket compared to java.

[ricardobeat]

I haven't, thats why I asked. Node is just 2 years old. You'll get 90% of garbage on any open package manager.

[soc88]

You make it sound like "rejecting blocking libraries" was some noble principle. Due to the severe limitations of JavaScript, there is no other choice.