I guess you mean while developing? Otherwise this is just wrong.
See e.g.: Twitter’s Shift from Ruby to Java Helps it Survive US Election - InfoQ
You may get here an solid answer, but surely not only here. And actually your answer kind of contradicts it.
hehe, that’s precisely what I’m talking about ;). In fact I think everyone, including myself, have often irrational preferences and are always biased against/for some technologies. Take PHP, and “PHP kiddies”. Well, Facebook is doing well with PHP, the chances are you can actually build decent software with it now days.
Yes, especially compilation - comparing to Elixir developing - using Java is really, really slow. One time when working with one designer in Elixir/Phoenix project he want lots of small “one-line fixes” - I can’t imagine doing this with Groovy/Grails + Tomcat, because this could take few hours instead of some minutes. In Elixir the only limitation while deploying is my network upload speed (uploading release archive to multiple nodes) and compilation is really fast enough for such situations.
Yes, but even Facebook felt compelled to create an “escape hatch” with Hack - which doesn’t really seem to be catching on within the PHP community proper.
(PHP 7 vs HHVM – Which One Should You Use?)
Eh, don’t be that hard on Java:
void* in C, blehg)Java7 is actually much faster than before and you can make good software in it now without fighting with it too much. However Joomla and Wordpress are both ‘old PHP’ things that are not made well. And with PHP it is easier to have security problems, but with enough discipline those are minimized (however yes, there are still lots of security issues with PHP, PHP7 closed more of those thankfully). It’s still faster than Ruby/Rails though. 
More secure by default is great yeah, but using PHP frameworks you get a lot of that too (if you tried to, say, re-implement Rails on Ruby you’d probably have a lot of security issues as well), but even by default Rails has a lot of security issues that are easy to fall in to unless you know to avoid them. Also Ruby/Rails is a lot slower than Groovy (no clue about Grails), and tomcat you should avoid anyway.
You get this with about any language with any decent IDE, and many languages, like Rust, do the same built-in. I think the biggest advantage of Elixir is it is built on the BEAM and instead of entirely ignoring its heritage it instead embraces it, which helps people to write proper code the first time instead of trying to figure it out (great docs for the BEAM!).
Also people need to quit saying that Facebook is using PHP, because they are not.
They are using HHVM, which is PHP-like in syntax, but it has types (whoo) and is much faster and has a different API and more and more. You can run PHP on it as well (and it is still faster than normal PHP) but it is not taking full advantage of its enhanced API and without putting the Types in the source it will not run as fast as it possibly can anyway. Facebook uses HHVM, they don’t use PHP anywhere anymore.
I’m not hard for Java. It’s my experience using Groovy/Grails and Tomcat about 2 years ago.
I don’t had yet any problems related to that, so it’s not a best pros for me.
I don’t - it was introduced in my first job. Owner was a really good person that listen others, but anyway imagine that he will change working solution like Tomcat to something else, because new developer says that it’s a slow as hell. 
You mean PHP 7, right? 
I also heard something about it and I can agree that it’s faster than Ruby, but in these 2 languages speed is not a big problem for newbie. They are enough fast to start work on it without required break for tea.
Hmm, interesting … I don’t compared their runtime speed. I don’t have so much time to develop two small similar projects.
hahah, you don’t understand me - I mean a result of that command like example of documentation and tests. Sorry, next time I will be more precise
Groovy sucks, no clue about Grails, and tomcat is utterly horrible. ^.^;
You’d never really had an issue where you accidentally passed a {:ok, something} to a function instead of a something? Or wanted to have a restricted set of inputs to a certain function that would not accept anything else and enforce the caller to verify it is correct before, say, blindly passing in user input? Or etc… etc… etc…? Type systems are awesome as they categorically prevent all those issues and far far far more.
Tomcat is not only slow but by default is very open and can be taken over with ease (locking it down is a first step of any install of it, and it is easy to miss a lot of vectors). But the container api for java is pretty well standard so you can literally take the server you have no and replace tomcat with a better one and it should all still ‘just work’ (usually).
Er, yes! ^.^;
Not just a little faster either, it is a magnitude of difference. But yeah not an issue if serving up to a few a second, but getting more than that and PHP can still survive where even well crafted Ruby/Rails apps will fail.
Even then it is common in a lot of languages (either built-in or via template-new-project-systems). ^.^
You might find these threads interesting
https://forum.elixirforum.com/t/what-do-you-think-are-the-most-appealing-aspects-of-elixir/2440
https://forum.elixirforum.com/t/why-elixir-slides-from-my-elixir-presentation/2431
https://forum.elixirforum.com/t/if-elixir-were-an-animal-what-would-it-be/2353
Actually the deployments for our java micro services is normally faster than with elixir.
I do not think that this is true anymore.
why do you think so?
and for java vs elixir… if you use and environment that is not just a postgres DB it can be really time consuming to use elixir where is just works with java…