Clojurians Log v2
graalvm
I’m trying to build a native image of an internal clojure service. I can successfully create the binary but when I execute it, I get Could not locate clojure/core/server__init.class, clojure/core/server.clj or clojure/core/server.cljc on classpath .
First of all, I’m puzzled why clojure.core.server is being loaded. It’s not referenced in my source.
Regardless, I can’t find the right twiddleebits to get around this problem. The relevant clojure.core.server class files are in my uber jar. My native-image command is
native-image -jar target/service-standalone.jar --no-fallback --initialize-at-build-time=org.slf4j.helpers,clojure --initialize-at-run-time=clojure.lang.Compiler
yes, you need to use --initialize-at-build-time= for every clojure package.
when using https://github.com/clj-easy/graal-build-time this will be done automatically
also probably remove --initialize-at-run-time=clojure.lang.Compiler
Doh! I included graal-build-time in my deps.edn but I forgot to add --features=clj_easy.graal_build_time.InitClojureClasses to my native-image command line
I'm looking at some examples of compiling Clojure with GraalVM, and I noticed that many sample projects in https://github.com/clj-easy/graalvm-clojure/tree/master, if not all, use:
:aot :all:main babashka.main
:aot [babashka.main]Avoid aot all, it can cause stuff to be compiled twice and cause weird bugs
@borkdude I can update the guide and add a tip about aot all being problematic…
I took graal-build-time 2.0.5 and I noticed this log:
[clj-easy/graal-build-time] Registering packages for build time initialization: clojure, clj_easy.graal_build_time, simplecgt.web.serverclj_easy.graal_build_time ? It sounds like the package is included in the final binary.
Shouldn't only facilitate the graalvm compilation?Dunno, did you include the dependency on the classpath of the uberjar and did you use aot all? If yes, then don't do that
So what I got:
• graal-built-time in classpath for uberjar
• aot only for main
• the only build time flag related to initialize is: --features=clj_easy.graal_build_time.InitClojureClasses
Here is this demo:
• https://github.com/rynkowsg/simple-cgt-web/blob/main/scripts/compile-native.bash#L17
• https://github.com/rynkowsg/simple-cgt-web/blob/main/project.clj
o wait, you do need it
but I don't think your image will actually contain any of this tool, it's probably how this is supposed to work
graalvm will cut out anything that is not reachable from your main entry point
Tbh I only noticed the log so I was curios whether this end up in the final binary or not
oh, nice