hi, is there anybody use conch and graalvm together before?

i wrote a commad line tool and compiled it with graal, it works fine when run with java -jar, but the compiled file throw a ClassNotFoundException: java.lang.ProcessBuilder error.

I'm trying to draw time series data onto a static image file, is there an aesthetically pleasing graphing lib out there by any chance?

is there a way to pretty print Json while writing it to a file?

the only way I found is

(spit output-file
          (with-out-str (json/pprint new-json-obj)))

which actually works but seems a bit of a weird way

I wonder why there is no format in the json API

Where can I report bugs in clojure core?

@roklenarcic https://dev.clojure.org

@andrea.crotti https://github.com/dakrone/cheshire#encoding

I mean this is a bug right? (proxy [URLClassLoader] [(make-array URL 0) ^ClassLoader (.getContextClassLoader (Thread/currentThread))]) emits reflection warning

there's no reason why there is a reflection warning there

@just_crashed I'm using clojure.data.json not chesire

@andrea.crotti so you're looking for a way to customize the pretty printer? data.json uses clojure.pprint under the hood, see http://clojuredocs.org/clojure.pprint if you want to dig inside. If you just want to print it to a file directly (without the intermediate string), see http://clojure.java.io/writer + (binding [*out* (writer ...)] pprint here)

@roklenarcic maybe it's because of some proxy magic? I have no idea to be honest.

@just_crashed I tried signing up for that clojure dev confluence, but it doesn't recognize my password and I just signed up prior, no confirmation email either... oh well... app still works despite the warning

what is the easiest way to replace all "-" with "_" in a complex nested json structure?

Hello. Playing with Datomic. I have a query using pull that does what I want, but the results use the #: namespace map syntax. Is there a way to get the results with fully expanded attribute names? So, {:equipmentType/typeName "Crane"} instead of #:equipmentType{:typeName "Crane"} Edit: hey, I found it! It was just REPL formatting. I did (set! print-namespace-maps false) in my REPL.

Can anyone explain to me why the first version of the code, while handling files sequentially works while the second versions hangs because after the report channel is filled (I set it with a buffer size of 10), all my threads are parked and nothing happens anymore in process-object? I am missing something

@joelmarty2 are there any processes taking something from reports channel?

there is, but it is never triggered

everything stops after 10 items are taken from s3objects

i guess the process consuming the reports is blocked since all threads are parked ?

so, in the first version, the consumer successfully takes reports?

yes

@joelmarty2 i tried your code with just processing integer and it works fine

the process-object function is blocking and may take a while to execute (something like 10s)

@joelmarty2 i put (Thread/sleep 10000) inside the process-object and still works

one difference I see is that you buffered the s3objects channel, which is not my case but it doesn't make any difference

if the process-object does blocking IO, then it's better to use pipeline-blocking instead of go-block.

i've looked into that but I am not sure my process-object function could be seen as a transducer, I don't know enough about transducers. the process function reads the s3 object line by line, parses it and makes some transforms and then writes the structures to a redis instance

the output is a report of what happened in between

so let's play around with it, you can create a transducer from your process-object function by simply (map process-object)

(a!/pipeline-blocking 1 results (map process-object) s3objects)

aah

yes

I'll try that

looks like it's working, thanks a lot @mavbozo

@joelmarty2 no problem, i'm sorry I can't help you find the problem with using go-block for your process. I still don't fully understand the go block

don't sweat it @mavbozo,I won't look further into it, I inherited this overly-complicated app and I don't plan to spend much more time on it, your solution works and using a library function is much more reliable that what I could have done

As a community, has a standard been established for naming spec definitions?

how to use clj cli compile java code? I have some java code in classpath

that's out of scope, clj is not a build tool

you can write some other code that compiles your java and uses clj; maybe someone has implemented that already

https://github.com/clojure/tools.deps.alpha/wiki/Tools

if you really want to, you could write a clojure program that used the JavaCompiler api to compile java :)

https://stackoverflow.com/questions/7989135/is-it-possible-to-programmatically-compile-java-source-code-in-memory-only

that is, clj is a program runner. the java compiler is a program.

what’s the clojure mechanism for something like:

(attempt (a) (b) (c))

smells kind of like an error monad i guess

I'd probably try (assert (some #(try (%) true (Catch Exception _)) [a b c]))

or something vaguely like it

@isaac If you wanted an example of using the Java compile API, I use it in pack.

@lwhorton you could look at the source of as->, and replace the let machinery it uses with and/`try/catch`

(if you prefer a form based rather than fn based solution)

oh, that’s a good idea :thumbsup:

where I can found the example @dominicm

thanks

is there a way to make an interface that "extends" another interface without gen-class?

im just messing around, this isnt that important

no

More or less on-topic: I always thought it was common sense to use OracleJDK in prod, does anyone know why Heroku nudges users (Clojure and JVM generally) to OpenJDK?

I think Oracle changed licensing such that commercial use is quite onerous.

no, they just changed their support model (which when was the last time you used jvm support?), and oracle has a bad image, so when they change things it is attributed to them wanting to do something shady (which I entirely believe), which begets any even worse image, which causes people to want to get away from them

doesn’t “jvm support” include releasing bug fixes and security patches, not just customer support?

it does

Another twist (something I didn't know until recently) is that it's Oracle that maintains OpenJDK too

@rplevy It looks like maybe Red Hat will step up to become the primary avenue of support for OpenJDK...

(and this discussion probably belongs in #java since it isn't really about Clojure -- which is not affected by Oracle's decisions 🙂 )

I just learned that Oracle is going to charge for support and updates for JDK 1.8 (minimum for Clojure 1.10) starting in January (I think that's what @hiredman was referring to actually)

does anyone have a good strategy to squash database migrations together?

I'm using migratus now so I just write the migrations as SQL, I guess I could - migrate everything - get the actual SQL schema from the database - create a new squashed migration with that schema, just a bit sad to lose all the comments and things like that though

does anyone have a working example of server-sent events with ring 1.16? I’m hitting a brick wall

What’s the best way to check that a map only has certain specified keys in clojure.spec.alpha? I tried following https://groups.google.com/forum/#!topic/clojure/fti0eJdPQJ8 So for example I have

(s/def ::message (s/merge (s/keys :req-un [::value])
                                            (s/map-of #{:value} any?)))

@jon324 What are you calling stest/check on? What does that function look like?

(does s/merge actually allow a spec that isn't just s/keys?)

Just started looking at juxt/edge and I’m wondering how it deals with externs?

great, thanx 😊

Do library owners normally sign their release artifacts with gpg when deploying to clojars? I recently released my first library, but it look me several hours to figure out how to sign the release artifacts with gpg. I develop on windows, but eventually used linux just to get gpg to work, and even still it took me a while. Now I'm trying to release another version, and I'm having issues with gpg again. gpg: signing failed: Permission denied

I know I can skip the signing, but is this a bad idea? I don't want to go that route, but these issues are driving me crazy

@brandon.ringe Do you use Leiningen for deploying to Clojars, or some other method? I've followed the Leiningen instructions for deploying, and while they were not a quick 5-minute read, they have worked.

From a Mac OS system, so Unix-like, not from Windows.

These are the instructions I am referring to: https://github.com/technomancy/leiningen/blob/master/doc/GPG.md

I am no gpg expert, so a cookbook approach is what I was looking for.

@andy.fingerhut Yes, I have read through them several times looking for something I may have missed. But I haven't tried storing my credentials yet, so maybe I need to do that.

I'm guessing it might be trying to use my key, seeing no credentials file, and just denying me, instead of prompting for credentials.

i've run into issues with gpg v1 vs v2. For some reason v1 keeps getting reinstalled from my package manager but v2 is the one that brings up a system wide prompt. Check gpg --version. I symlink gpg2 to gpg and mv gpg version 1 to gpg_old

I am trying out tools.trace on a project where there are Clojure protocols, and there are deftype types that implement those protocols, and also extend-type forms that cause those protocols to be implemented for built-in JDK classes. When I try tools.trace's trace-ns on the namespace, or trace-var on the name of one of the protocol methods, I see traces of calls to the methods defined with extend-type on the built-in JDK class, but I do not see any messages about the calls to that protocol method on the Clojure deftype. Does this sound like a limitation of tools.trace's capabilities that would be difficult to change?

A related question would be - if you wanted to trace such calls, is there a method other than using tools.trace, and inserting debug println calls, that you use?