A helloworld application written in clojure built and run on GraalVM
- Clojure 1.8 or higher
- Leiningen 1.0.0 or higher
- GraalVM 0.32 or higher
$ lein uberjar --- builds the uberjar in the target folder
In case, you get an error like this "javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target" or something similar to the security certificate missing, please follow the steps mentioned at oracle/graal#493 (comment). Its due to missing or an incorrect cacert present in the $JAVA_HOME/lib/security or $JAVA_HOME/jre/lib/security folders.
$ native-image -jar target/uberjar/helloworld-0.1.0-SNAPSHOT-standalone.jar --- builds the native image of the above jar
$ java -jar target/uberjar/helloworld-0.1.0-standalone.jar
$ ./helloworld-0.1.0-SNAPSHOT-standalone
benchmark.sh and footprint.sh have been provided to be able to compare performance benchmarks and footprints of traditional JVM and GraalVM built Jar applications.
These scripts need both the standalone jar and native image files present to work.
Metrics from both scripts:
benchmark.sh
Running clojure hello world via java -jar command
Hello, World!
real 0m2.199s
user 0m4.227s
sys 0m0.358s
Running clojure hello world via graalvm
Hello, World!
real 0m0.098s
user 0m0.005s
sys 0m0.005s
footprint.sh
Footprint of clojure hello world jar
8512 -rw-r--r-- 1 swami staff 3.5M 9 Oct 22:54 target/uberjar/helloworld-0.1.0-SNAPSHOT-standalone.jar
plus the size of the jre that we bundle with the standalone jar
190M /Library/Java/JavaVirtualMachines/jdk1.8.0_172.jdk/Contents/Home/jre
Footprint of clojure hello world graalvm native image
15888 -rwxr-xr-x 1 swami staff 7.8M 9 Oct 22:57 ./helloworld-0.1.0-SNAPSHOT-standalone
Copyright © 2019
Distributed under the Eclipse Public License either version 1.0 or (at your option) any later version.