gttp - simple HTTP server in Groovy

Inspired by http://melix.github.io/blog/2019/03/simple-http-server-graal.html

Install Groovy

$ sdk install groovy 3.0.5

Install GraalVM 20.2 (JDK 11)

$ sdk install java 20.2.0.r11-grl

$ sdk use java 20.2.0.r11-grl

$ gu install native-image

Compile gttp

$ groovyc --compile-static gttp.groovy

Run gttp with native-image-agent

$ java -agentlib:native-image-agent=config-output-dir=conf/ -cp ".:$GROOVY_HOME/lib/groovy-3.0.5.jar" gttp 

Build native image

$ native-image --allow-incomplete-classpath \
  --report-unsupported-elements-at-runtime \
  --initialize-at-build-time \
  --initialize-at-run-time=org.codehaus.groovy.control.XStreamUtils \
  --no-fallback \
  --no-server \
  -H:ConfigurationFileDirectories=conf/ \
  -cp ".:$GROOVY_HOME/lib/groovy-3.0.5.jar" \ 
  gttp

Run gttp as a standalone executable file

$ ./gttp
Listening at http://localhost:8080/

Change default port

$ ./gttp 9000
Listening at http://localhost:9000/

Change default base directory to /tmp

$ ./gttp 9000 /tmp
Listening at http://localhost:9000/

Alternative: setup environment & build in a docker container

You can also use attached Dockerfile to install all required components, compile Groovy script to Java bytecode, and generate standalone executable file using native-image tool.

$ sh ./build-with-docker.sh