Build Java module runtime image for other OS

Question

I have rewritten my little Java 8 project from simple jar to single module in Java 11. In past I was building jar with Gradle and it was compatible with Windows and Linux. Now I configured Gradle to build my module and create custom runtime image and it is working but only on Linux. My custom runtime image contains only Linux libraries. Is there possibility to build image for Windows on Linux? I know I could open my project on Windows and create there image but I would like to keep my project on single OS. Here is my Gradle build:

plugins {
    id 'application'
    id 'org.openjfx.javafxplugin' version '0.0.5'
}

group 'eu.sample'
version '2.0'


repositories {
    mavenCentral()
}

javafx {
    modules = [ 'javafx.controls', 'javafx.fxml' ]
}

mainClassName = "$moduleName/eu.sample.app.Main"

def java_home = hasProperty('org.gradle.java.home') ? getProperty('org.gradle.java.home') : System.getenv('JAVA_HOME')
def fx_jmods = hasProperty('path.to.fx.mods') ? getProperty('path.to.fx.mods') : System.getenv('PATH_TO_FX_MODS')

dependencies {

}

task jlink(type: Exec) {
    dependsOn 'clean'
    dependsOn 'jar'

    workingDir 'build'

    if (java_home == null) {
        throw new RuntimeException("java_home is not defined.")
    }
    if (fx_jmods == null) {
        throw new RuntimeException("fx_jmods is not defined.")
    }
    commandLine "${java_home}/bin/jlink", '--module-path', "libs${File.pathSeparatorChar}${fx_jmods}",
            '--add-modules', "${moduleName}", '--output', "${moduleName}", '--strip-debug',
            '--compress', '2', '--no-header-files', '--no-man-pages'
}

I added to build.gradle lines, before fire jlinkWin task I run clean task:

task jlinkWin(type: Exec) {
    dependsOn 'clean'
    dependsOn 'jar'

    workingDir 'build'

    if (java_home == null) {
        throw new RuntimeException("java_home is not defined.")
    }
    if (fx_jmods == null) {
        throw new RuntimeException("fx_jmods is not defined.")
    }
    commandLine "${java_home}/bin/jlink", '--module-path', "/home/user1/Download/win-jdk-11.0.1/jmods${File.pathSeparatorChar}libs${File.pathSeparatorChar}${fx_jmods}",
            '--add-modules', "${moduleName}", '--output', "${moduleName}", '--strip-debug',
            '--compress', '2', '--no-header-files', '--no-man-pages'
}

Updated code above which creates custom runtime image for Windows but with out JavaFX libs.

This is not about gradle, but may help: https://stackoverflow.com/questions/47593409/create-java-runtime-image-on-one-platform-for-another-using-jlink — ernest_k, Dec 13 '18 at 08:36
@ernest_k that is useful information, thank you. I didn't found this. — GarryMoveOut, Dec 13 '18 at 08:50
You need to include the windows libraries as well as the Linux ones in your distribution. — Peter Lawrey, Dec 13 '18 at 08:57
Problem is unsolved. I can not run image on Windows. There is no dll libraries of JavaFX in image. — GarryMoveOut, Dec 13 '18 at 09:56

score 0 · Answer 1 · answered Dec 13 '18 at 10:42

Download JDK (ex. openJDK) and openjfx jmods archive for platform you are interested (in this example Windows and Linux), extract them somewhere, next modify configuration file of gradle build.gradle.

plugins {
    id 'application'
    id 'org.openjfx.javafxplugin' version '0.0.5'
}

group 'eu.sample'
version '2.0'


repositories {
    mavenCentral()
}

javafx {
    modules = [ 'javafx.controls', 'javafx.fxml' ]
}

mainClassName = "$moduleName/eu.sample.app.Main"

def lin_java_home = hasProperty('org.gradle.java.home') ? getProperty('org.gradle.java.home') : System.getenv('JAVA_HOME')
def lin_fx_jmods = hasProperty('linux.fx.mods') ? getProperty('linux.fx.mods') : System.getenv('PATH_TO_FX_MODS_LIN')

def win_java_home = hasProperty('windows.java.home') ? getProperty('windows.java.home') : System.getenv('JAVA_HOME_WIN')
def win_fx_jmods = hasProperty('windows.fx.mods') ? getProperty('windows.fx.mods') : System.getenv('PATH_TO_FX_MODS_WIN')

dependencies {

}

task jlink(type: Exec) {
    dependsOn 'clean'
    dependsOn 'jar'

    workingDir 'build'

    if (lin_java_home == null) {
        throw new RuntimeException("java_home is not defined.")
    }
    if (lin_fx_jmods == null) {
        throw new RuntimeException("fx_jmods is not defined.")
    }
    commandLine "${lin_java_home}/bin/jlink", '--module-path', "libs${File.pathSeparatorChar}${lin_fx_jmods}",
            '--add-modules', "${moduleName}", '--output', "${moduleName}", '--strip-debug',
            '--compress', '2', '--no-header-files', '--no-man-pages'
}

task jlinkWin(type: Exec) {
    dependsOn 'clean'
    dependsOn 'jar'

    workingDir 'build'

    if (win_java_home == null) {
        throw new RuntimeException("java_home is not defined.")
    }
    if (win_fx_jmods == null) {
        throw new RuntimeException("fx_jmods is not defined.")
    }
    commandLine "${lin_java_home}/bin/jlink", '--module-path', 
            "${win_java_home}/jmods${File.pathSeparatorChar}libs${File.pathSeparatorChar}${win_fx_jmods}",
            '--add-modules', "${moduleName}", '--output', "${moduleName}", '--strip-debug',
            '--compress', '2', '--no-header-files', '--no-man-pages'
}

And add or modify gradle.properties, add paths to JDK's and openjfx jmods:

org.gradle.java.home=/usr/java/jdk-11/
windows.java.home=/home/user1/Download/win-jdk-11.0.1/

linux.fx.mods=/usr/lib64/javafx-jmods-11.0.1
windows.fx.mods=/home/user1/Download/javafx-jmods-11.0.1/

Finally fire gradle task jlink to build image for Linux or jlinkWin for Windows

Build Java module runtime image for other OS

1 Answers1

Linked