Anyone able to quickly spot why evaling this code in my repl would produce the correct results e.g (= 1 (jdbc/query db-info "select COUNT(*) from dogs;") is true. But when i run lein test i get false (there are no inserted rows). I tried inserting a delay in case for some reasons the insert wasn’t synchronize. I suspect i’m doing something much more basic wrong.

Very beginner question. Is (require '[clojure.string :as s]) supposed to creash lein test with Call to clojure.core/ns did not conform to spec exception?

Is there a way to print out a dependency tree of your namespaces?

@drewverlee probably test is using in memory db?

when making an uberjar with lein, is it recommended to use :aot :all? does it matter?

from googling information seems a bit sparse

@squarenegative There's a camp that thinks you shouldn't use AOT at all.

At World SIngles, we do not AOT anything.

Our uberjars are pure source (well, clojure.core is compiled, but that's how it is packaged).

@seancorfield what's the advantage of not AOT compiling?

AOT can be very problematic...

causing unexpected behavior?

A lot of problems have been fixed over the years but and, if it's the very last step of deployment of a complete application, rather than a library, it can help with startup time, but if startup time isn't a problem, it just isn't worth it, IMO. https://dev.clojure.org/display/design/AOT+Problem+Overview

If you're server is up most of the time, AoT

isn't worth it

I guess it's more reasonable to consider compiling AoT if you're developing a gui application

Agreed. For server processes, I see no values in AOT at all.

but then again, is there really any considerable differences in startup time? I've never measured it

If you have a lot of code and a lot of dependencies, yeah, start up time can be "high" -- but, to be honest, we see more startup overhead from New Relic weaving all the classes than from Clojure compilation...

huh good to know, thank you. I'm making a basic server and i'll disable aot

it looks like you still have to aot compile -main right?

i tried to put skip-aot in my lein profile and the uberjar wouldn't run

No, you don't need AOT at all.

But you'll want to specify the main namespace.

I think lein makes that more difficult than it needs to be.

I have :main ^:skip-aot server.core as part of my profiles.clj

which gives me Warning: The Main-Class specified does not exist within the jar. It may not be executable as expected. A gen-class directive may be missing in the namespace which contains the main method, or the namespace has not been AOT-compiled.

and the jar won't run

Specify clojure.main as the :main. Then the JAR will run a REPL by default.

clojure.main accepts -m to specify a "main" namespace.

So you can have a single JAR file with multiple -main functions in different namespaces, and specify which one to run at startup.

I see

java -jar myapp.jar -m my.namespace

does running as a repl incur any performance cost?

It doesn't run "as a REPL".

I just meant that clojure.main's default behavior -- if you do not specify -m -- is to start a REPL.

But Clojure's normal behavior is basically how the REPL works: load code, compile it to bytecode, run it.

gotcha, thanks

If you use the official clj command-line stuff instead of lein to run code, it works this way (without making an uberjar).

yeah, i heard about that. i'm still new though and lein seems super easy, so sticking with it for now

Yeah, although I think Boot is much more intuitive.

yeah i'll definitely check it out intuitively

right now I just need to finish up a simple api server for a club

*eventually not intuitively ^^

is there a way to get the uberjar without aot, and be able to run it as just java -jar app.jar? assumign I only have one main

i've been playing around but not sure

If anyone wants to mess around with foundationdb: https://github.com/alex-dixon/clj-foundationdb

I'm working on a project where I'm implementing SSO via SAML with a single SP and a variable amount of IDPs. I've used buddy-auth in the past for regular user/password auth, but I was unable to tell if that library supports SSO via SAML. Can anyone recommend a stable library?

@kharper General advice: if there isn’t a proper clj lib available, just use a Java lib directly

@borkdude That's most likely what I'll have to do, thanks!

often using the java lib is better even if there is a wrapper available

especially if mutation or io are in the fundamental domain of the lib

I realize there is a dedicated channel, posting here as that channel does not seem very active: for those using Neanderthal + ClojureCuda, is there any sample code that uses cuBlas + custom kernel funtions? With neanderthal I see code for using cublas. With ClojureCuda, I see how to sue custom kernels, but I can't find sample code that uses both on a single piece of gpu memory.

piggy backing on that conversation about AOT, has anyone tried using clojure for aws lambda functions?

My biggest concern is startup time

I know java in general performs pretty subpar compared to python and nodejs for cold starts

I use https://github.com/portkey-cloud/portkey for clojure + aws lambda. It's not been a problem so far.

@emccue I've heard of people using Clojure for AWS Lamba, but also keeping things running. I've also heard of people using ClojureScript / Node instead to address launch latency concerns.

To give some context, we have a need for a 3rd party to send us an "event" for any kind of interaction a user makes with content

so if they change the title of something, we need to process that new title

one idea is to have a lambda process the events from sqs

but good god we get a huge spike in traffic around this time of the year

whatever we put in that lambda will be a small amount of code; the majority of the work will be in the infrastructure and finding a way to be reliable in the case that an aws region goes down

Have you tried https://github.com/portkey-cloud/portkey ?

no, honestly i spent the last 2 hours sleeping on the carpet

Ill get around to it at some point

Its still alpha, so its probably not the best choice for work

Id probably end up just gen-class-ing the required entry point or write that in a java file

I know there was a lib somewhere that has a deflambdafn but its whatever

I do like the repl idea though