Java environment in Windows Server Core setup using PowerShell - DevOps Hackathon

Dockerfile

# Starting Dockerfile for a Java based project in Windows Server Core with JDK integrity check
FROM microsoft/windowsservercore
SHELL ["powershell", "-Command", "$ErrorActionPreference = 'Stop';"]

WORKDIR c:/setup

# Set variables for OpenJDK pull
ENV JAVA_VERSION="1.8.0.111-3" `
    JAVA_ZIP_VERSION="1.8.0-openjdk-1.8.0.111-3.b15" `
    JAVA_SHA256="e080371bf57536668416157660e05d95fe04db15da36234d32bda8e301bb0454" `    
    JAVA_HOME="C:\openjdk"

# wget equivalent with additional steps for integrity
RUN Invoke-WebRequest $('https://github.com/ojdkbuild/ojdkbuild/releases/download/{0}/java-{1}.ojdkbuild.windows.x86_64.zip' -f $env:JAVA_VERSION, $env:JAVA_ZIP_VERSION) -OutFile 'openjdk.zip' -UseBasicParsing ; `
    if ((Get-FileHash openjdk.zip -Algorithm sha256).Hash -ne $env:JAVA_SHA256) {exit 1} ; `
    Expand-Archive openjdk.zip -DestinationPath C:\ ; `
    mv "C:\java-$($env:JAVA_ZIP_VERSION).ojdkbuild.windows.x86_64" 'c:\openjdk';
    $env:PATH = '{0}\bin;{1}' -f $env:JAVA_HOME, $env:PATH ; `
    [Environment]::SetEnvironmentVariable('PATH', $env:PATH, [EnvironmentVariableTarget]::Machine) ; `
    Remove-Item -Path openjdk.zip