If it interests anyone, I wrote a blog post about a couple “little" things in Clojure that I would miss: https://www.adamfrey.me/posts/clojures-little-things.html

For current_timestamp(), I would say you could set a default column value for the table, or use something to write the insert in plain sql.

Can anyone explain why a clojure program I wrote can print out the classname of a reified interface, but when I pass control to a java framework, it cannot find that class? Does clojure have it's own class-loader? Is there a way to tell the java framework about it?

Have you tried to find the answer to that in the Clojure source code?

I see DynamicClassLoader...

I can't find the channel for clojure dev like there is for #C07UQ678E but if you can you could ask there as well.

I don't know the answer.

Mm, I wonder if the framework is trying to find it in another thread

#C06E3HYPR

thanks

Because your question is pretty advanced.

This looks relevant: https://groups.google.com/forum/#!searchin/clojure/classloader/clojure/-n3jul1IeZ8/tKGAg-_zEmIJ

@meow: #C06E3HYPR is for discussions regarding the development of clojure itself, not about advanced questions on clojure

please let's keep it that way

Okay, sorry @bronsa.

Are there any strong opinions on TrapperKeeper? It's error handling seems superior to component, especially as it means you don't need to try/catch everywhere.

Does anyone know a decent (meaning fast and light) 2d graphics library usable from clojure? I’m trying to design an application with cutom GUI and nothing seems to fit very well. seesaw is too desktopy, Quil uses 5% CPU on rendering a black rectangle on white background, Java2D doesn’t look very solid, OpenGL is an overkill...

How about JavaFX? It seems decent-ish and has some seemingly legit wrappers.

had a look, didn’t like it

ideally, I’d just use cljs and reagent to draw SVG but this would bring huge webkit into the scene

Well, some do that with node-webkit or electron; I'm not sure if it's that big of liability. Apps like atom or visual studio code seem to work relatively well.

But if you want to do it with a 2D graphics lib, then maybe look at game libraries like libgdx? It has both OpenGL and 2D graphics APIs, so it might fit your use-case.

@nooga: even has a skinnable UI library it seems - https://github.com/libgdx/libgdx/wiki/Scene2d.ui

thx, I’ll have a look

@nooga SVG for clojure/script was discussed in #C0F0V8DT5 but I can't remember the name of the library so check there

thx

Hi, I have created a project via "lein new reloaded myproject" when I try to (reset) the tools.namespace/refresh fails with the exception that one of my namespaces can't be found, although it is at the proper place

Is there a known tools.namespace bug?

For the record: I can do a (require '...) on the repl without a problem

can you post the error somewhere?

ok, seems to be a problem with AOT. Switched off AOT and did a "lein clean" - now it works as expected

clojure.string/trim doesn't seem to work with some space-like characters... e.g., (clojure.string/trim (str "hmm" \o240)) Is there stronger stuff out there?

@harold \o240 is not whitespace so trim won't work. You'll probably need to build a regex pattern using replace

Makes sense.

Well, this seems to be a Java thing

http://stackoverflow.com/questions/1060570/why-is-non-breaking-space-not-a-whitespace-character-in-java

In ClojureScript it’s considered a space

more on this here: http://www.adamkoch.com/2009/07/25/white-space-and-character-160/

Some browsers match non breaking space as a whitespace, but in Java is not (which I believe is correct)

Oh, it’s browser-specific?

sadly, It appears to be…

Interesting

BTW in a cljs repl trim does treat it as whitespace (or it did when I just tried in using nREPL to a REPL in Chrome)

Yeah, when I tried it I saw that as well. But I didn’t consider the fact that it could be browser-specific

T I L ❤️

is there a way to list all files in resources?

@roberto: https://clojuredocs.org/clojure.core/file-seq

that takes a dir as an argument

which is the problem

so, in test and dev mode, I can pass in the dir

but it won’t work when it is packaged as a jar

because all the files in resources are loaded in the classpath

looks like everyone is having this problem..

I want to be able to list all the files in the resources

hmmm

that is a bummer

https://github.com/boot-clj/boot/issues/409

means I might need to do some very invasive code changes

it's the way the jar is packaged

i hate it when something works in dev/test and when you deploy it doesn’t work the same way

it's not the build tools fault

I’m not blaming the build tool

no I'm saying it's possible that all three environments work

you just need to do some folder rearrangement

yeah, which is not that easy at times

requires some negotiation with the rest of the team in this case

and some modifications to the deployment process

anyway, thanks. At least now I know I shouldn’t be pursuing this further

can't speak to if this is a good idea roberto, but http://www.uofr.net/~greg/java/get-resource-listing.html

also http://clojure.github.io/java.classpath/

(classpath-jarfiles) may be useful

nice

thanks, I hadn’t seen that

this is very helpful

awesome, this worked. Thank you @ghadi

I am writing a service which fetches some rss feeds, scrapes some sites and formats the data into something I want. I have written a simple ring handler which puts this data into the response and everything is fine.. except, I dont want to fetch and parse the data for each request, one time per hour is sufficient. How do you guys usually handle something like this? core.cache, core.memoize?

@profil: I would use ttl in core.memoize

how do I extract information from an error? When I evaluate the error at the repl I see #error{:cause "...", :via ...} but (:cause error) returns nil

as does (ex-data error)

It's of type com.jcraft.jsch.JSchException if that's important

Use Throwable->map

perfect, thank you!

I’m struggling to create a kerodon test for a toy app using duct. I’ve got a form with one input field. if I’m running it in the repl / browser then the parameter is passed, but when running in kerodon it arrives as ‘nil’ to the handler. any obvious thing i’ve missed? I’m using the same config, so wrap-param should be present for my test too.

Is there a way I could have figured that out on my own? I didn't know that java errors were "Throwable"s

(I am a beginner, so any silly mistake you may think possible (and some that probably aren’t) are fair suggestions.)

happy to share my code too, tbh.

https://github.com/stig/accounts/pull/1/files

@arijun: not sure - it's new so actually not many people know about it