hmasum52 / java-custom-jre-tutorial

This project demonstrates how to make custom JRE to run a java project on any machine.

Source code

Table of content

• Compiling a Module
  • Compile and create class file in out folder
  • Compile and create class file in out folder
  • Run the class file from out folder
    • ouput
• Using jdeps to List the Dependent Modules
  • output
• Creating a Custom JRE with jlink
• Run code with custom JRE
• Creating Custom JRE with Launcher Scripts

Compiling a Module

Compile and create class file in out folder

javac -d <output location> module-info.java

//example
javac -d out module-info.java

Compile and create class file in out folder

javac -d <output location> --module-path <module-info.class location> <java file location>

//example
javac -d out --module-path out github\hmasum18\jlinkTest\HelloWorld.java

Run the class file from out folder

java --module-path <module-info.class location> --module <module name>/<file name with full package name>

//example
java --module-path out --module helloWorld/github.hmasum18.jlinkTest.HelloWorld

ouput

Mar 07, 2021 6:34:41 PM github.hmasum18.jlinkTest.HelloWorld main
INFO: hello world from masum

Using jdeps to List the Dependent Modules

jdeps --module-path <all the module path separated by semi colon(;)> -s --module <module names separated by comma>

//example
jdeps --module-path out -s --module helloWorld

output

helloWorld -> java.base
helloWorld -> java.logging

or

jdeps --list-deps --module-path <all the module path separated by semi colon(;)> -add-module <module names separated by comma>

//example
jdeps --list-deps  --module-path out --add-modules helloWorld

//example with javafx
jdeps --list-deps  --module-path "lib\javafx-sdk-11.0.2\lib";"lib\gson-2.8.6.jar";"lib\jfoenix-9.0.10.jar";"out\production\CarShowRoomFrontend" --add-modules fontend

Creating a Custom JRE with jlink

jdeps --module-path <all the module path separated by semi colon(;)> --add-modules <module names> --output <custom jre output location>

//example
jlink --module-path "%JAVA_HOME%\jmods";out --add-modules helloWorld --output customjrefolder

Run code with custom JRE

"<custom jre bin file location>\java" --module-path <module-info.class file location> -m <module name/java file location with package name>

//example
"customjrefolder\bin\java" --module-path out -m helloWorld/github.hmasum18.jlinkTest.HelloWorld

Creating Custom JRE with Launcher Scripts

jlink --launcher helloWorldLauncher=helloWorld/github.hmasum18.jlinkTest/HelloWorld --module-path "%JAVA_HOME%\jmods";out --add-modules helloWorld --output customJreLauncherFolder