Utility project for calculating the size of modules within a JVM distribution.
This calculator will help you determine how much your JVM distribution (i.e. docker image) can be reduced in size for a specific application.
European Union Public Licence v1.2.
Build the Maven project,
cd calculator
mvn clean package
then run
java -jar target/calculator-0.0.1-SNAPSHOT.jar
to see the module size within the currently installed JVM.
Run
java -jar target/calculator-0.0.1-SNAPSHOT.jar <comma-seperated-modules>
i.e.
java -jar target/calculator-0.0.1-SNAPSHOT.jar java.base,java.compiler,java.desktop
to calculate the size of modules within the current JVM.
List module sizes using the script
./printModuleSizes.sh <docker-image>
i.e.
./printModuleSizes.sh bellsoft/liberica-runtime-container:jdk-all-17-musl
or calculate specific module sizes using
./calculateModulesSize.sh <docker-image> <comma-seperated-modules>
i.e.
./calculateModulesSize.sh bellsoft/liberica-runtime-container:jdk-all-17-musl "java.base,java.compiler,java.desktop,java.instrument,java.management,java.naming,java.net.http,java.prefs,java.rmi,java.scripting,java.security.jgss,java.security.sasl,java.sql,java.xml.crypto,jdk.httpserver,jdk.jfr,jdk.unsupported,jdk.xml.dom"
The project includes a fully working example for Liberica docker images with bash scripts:
- builds Spring Boot Maven project
- extracts the relevant modules using
jdeps - builds a custom base image using
jlink - builds a custom image with the Maven artifact