Using jabba to Switch JDK Versions Globally on Windows

[xiangdyzz]

Define a function in the PowerShell profile $PROFILE to switch JDK versions globally. You can edit the $PROFILE file by running the following command in PowerShell:

notepad $PROFILE

Add the following content to the $PROFILE file:

function Set-JDK {
    param (
        [string]$Version
    )

    switch ($Version) {
        "1.8" {
            $jabbaVersion = "system@1.8.0"
        }
        "1.17" {
            $jabbaVersion = "openjdk@1.17.0"
        }
        default {
            Write-Host "Unknown version: $Version. Please use '1.8' or '1.17'."
            return
        }
    }

    if (-not $jabbaVersion) {
        Write-Host "JDK version not set."
        return
    }

    jabba use $jabbaVersion

    $jdkPath = (jabba which $(jabba current)).Trim()

    if (-not $jdkPath) {
        Write-Host "Unable to get JDK path. Please check the JDK version."
        return
    }

    [Environment]::SetEnvironmentVariable('JAVA_HOME', $jdkPath, 'User')
    Write-Host "JAVA_HOME environment variable set to: $jdkPath"
    Write-Host "Switched to JDK version $Version ($jabbaVersion)."
}

Set-Alias jdk Set-JDK

To reload the profile and make the new function effective, run the following command in PowerShell:
. $PROFILE

Now, you can switch JDK versions using the jdk command. For example:

jdk 1.8
jdk 1.17