Added GraalVM for Java 21.

GraalVM-Java21/graalvmjava21.nuspec

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2015/06/nuspec.xsd">
+  <metadata>
+    <id>graalvm-java21</id>
+    <version>21.0.0</version>
+    <packageSourceUrl>https://github.com/johanjanssen/ChocolateyPackages/tree/master/GraalVM-Java21</packageSourceUrl>
+    <title>GraalVM Java 21</title>
+    <authors>Oracle</authors>
+    <owners>JohanJanssen</owners>
+    <licenseUrl>https://github.com/oracle/graal/blob/master/LICENSE</licenseUrl>
+    <projectUrl>https://www.graalvm.org/</projectUrl>
+    <docsUrl>https://www.graalvm.org/docs/introduction/</docsUrl>
+    <mailingListUrl>http://mail.openjdk.java.net/mailman/listinfo/graal-dev</mailingListUrl>
+    <bugTrackerUrl>https://github.com/oracle/graal/issues</bugTrackerUrl>
+    <projectSourceUrl>https://github.com/oracle/graal</projectSourceUrl>
+    <tags>openjdk java jvm</tags>
+    <summary>GraalVM is a virtual machine to run applications in different programming languages such as Java, Scala, Kotlin, JavaScript, Python, C, C++ and many more</summary>
+    <description>GraalVM is a virtual machine to run applications in different programming languages such as Java, Scala, Kotlin, JavaScript, Python, C, C++ and many more</description>
+  </metadata>
+</package>

GraalVM-Java21/tools/chocolateyinstall.ps1

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+$programFiles = (${env:ProgramFiles}, ${env:ProgramFiles(x86)} -ne $null)[0]
+$installDir = "$programFiles\GraalVM"
+$version = "21+35.1"
+
+$packageArgs = @{
+    PackageName = $env:ChocolateyPackageName
+    UnzipLocation = $targetDir = $installDir
+    Url64bit = 'https://github.com/graalvm/graalvm-ce-builds/releases/download/jdk-21.0.0/graalvm-community-jdk-21.0.0_windows-x64_bin.zip'
+    Checksum64 = '808b65fae4ab03a2f52b5850852d7c7e098608aa8bbab918d40e8aeec870ae5f'
+    ChecksumType64 = 'sha256'
+}
+
+Install-ChocolateyZipPackage @packageArgs
+Install-ChocolateyEnvironmentVariable 'JAVA_HOME' $targetDir\graalvm-community-openjdk-$version 'Machine'
+# The full path instead of the %JAVA_HOME% is needed so it can be removed with the Chocolatey Uninstall
+Install-ChocolateyPath $targetDir\graalvm-community-openjdk-$version\bin -PathType 'Machine'

GraalVM-Java21/tools/chocolateyuninstall.ps1

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+$programFiles = (${env:ProgramFiles}, ${env:ProgramFiles(x86)} -ne $null)[0]
+$installDir = "$programFiles\GraalVM"
+$version = "21+35.1"
+
+Uninstall-ChocolateyEnvironmentVariable 'JAVA_HOME' 'Machine'
+rm -r "$installDir\graalvm-community-openjdk-$version"
+
+$pathToUnInstall = "$installDir\graalvm-community-openjdk-$version\bin"
+$pathType = 'Machine'
+
+$statementTerminator = ";"
+
+$actualPath = [System.Collections.ArrayList](Get-EnvironmentVariable -Name 'Path' -Scope 'Machine' -PreserveVariables).split($statementTerminator)
+
+if ($actualPath -contains $pathToUnInstall)
+{
+	Write-Host "PATH environment variable contains $pathToUnInstall. Removing..."
+
+	$actualPath.Remove($pathToUnInstall)	
+	$newPath =  $actualPath -Join $statementTerminator
+
+	$cmd = "Set-EnvironmentVariable -Name 'Path' -Value `'$newPath`' -Scope 'Machine'"
+
+    if (Test-ProcessAdminRights) {
+        Invoke-Expression $cmd
+    } else {
+        Start-ChocolateyProcessAsAdmin "$cmd"
+    }
+}