A PowerShell Script to build Java Runtime from JDK 11+

build-jre.ps1

if (-Not (Test-Path Env:JAVA_HOME)) {
    Write-Output "JAVA_HOME environment variable is not set."
    Exit 1
}

$Env:PATH = $Env:JAVA_HOME + "\bin;" + $Env:PATH

$VERSION_LINE = (java -version 2>&1 | Select-String version)
$NAME = ($VERSION_LINE | %{$_.Line.Split(' ')[0];})
$VERSION = ($VERSION_LINE | %{$_.Line.Split(' ')[2].Replace("`"", "");})
$JRE_NAME = $NAME + "-" + $VERSION + "-jre"

$MODULES = ""
java --list-modules | ForEach-Object { 
    $MODULES += ($_ -replace "@.*") + ","
}
$MODULES = ($MODULES -replace ",$")

Write-Output "Building JRE to directory: .\$JRE_NAME"
jlink --no-header-files --no-man-pages --compress=2 --add-modules ${MODULES} --output ${JRE_NAME}


$WORD_SIZE = (java -version 2>&1 | Select-String Bit | %{$_.Line.Split(' ')[1].Replace("-Bit", "");})
$JRE_ZIP = $JRE_NAME + "_windows-x" + $WORD_SIZE + ".zip" 

Write-Output "Making JRE package: .\$JRE_ZIP"
Compress-Archive -Path $JRE_NAME -DestinationPath $JRE_ZIP

Write-Output "Removing diretory: .\$JRE_NAME"
Remove-Item -Recurse -Force -LiteralPath $JRE_NAME

Write-Output "Created JRE package: .\$JRE_ZIP"