Run Java in PowerShell

java.ps1

using namespace Python.Runtime
# Install-Module Import-Package | Import-Module
Import-Package pythonnet

& {
    $dll = Try {
        where.exe python | ForEach-Object {
            $root = $_ | Split-Path -Parent
            $name = $root | Split-Path -Leaf

            "$root\$name.dll"
        } | Where-Object { Test-Path $_ } | Resolve-Path
    } Catch {
        [string] $promptedDll = $null
        While( -not ([string]::IsNullOrEmpty( $promptedDll )) ){
            $promptedDll = Read-Host "Please provide a python to the python shared library (python.dll/python.so)"
        }
        $promptedDll
    }
    [Python.Runtime.Runtime]::PythonDLL = $dll
}

[Python.Runtime.PythonEngine]::Initialize()  | Out-Null
[Python.Runtime.PythonEngine]::BeginAllowThreads() | Out-Null

New-Module -Name "CPython-GIL" -ScriptBlock {
    $state = @{ "lock" = $null }

    function global:Lock-Python {
        Write-Host "Python GIL is now locked. Unlock it ANYTIME with Unlock-Python." -ForegroundColor Yellow
        $state.lock = [Python.Runtime.Py]::GIL()
    }
    function global:Unlock-Python {
        $state.lock.Dispose()
    }

    Export-ModuleMember
} | Import-Module

Lock-Python

$jpype = [py]::Import("jpype")
[py]::import("jpype.imports")
[py]::import("jpype.types")

$jpype.startJVM()
$system = $jpype.JPackage("java.lang").System
$system.out.println("Hello World from Java!")
$jpype.shutdownJVM()