JavaVersionManager

JavaVersionManager is a lightweight PowerShell module for managing multiple installed Java versions on Windows. It allows you to list configured Java versions and easily switch between them by updating the JAVA_HOME environment variable and adjusting the PATH for the current session.

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Features

• List installed Java versions
• Display the currently active Java version
• Switch Java version in the current terminal session
• Optional output of the full Java binary path

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Installation

From PowerShell Gallery

Install-Module -Name JavaVersionManager -Scope CurrentUser

Then import it:

Import-Module JavaVersionManager

From local folder

Import-Module ./JavaVersionManager.psm1

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Environment Configuration

Before using the module, you must define the available Java versions on your machine using a global hashtable. This should be done in your PowerShell profile (e.g., Microsoft.PowerShell_profile.ps1).

# JAVA VERSION MANAGER
if (-not $Global:JavaVersions) {
    $Global:JavaVersions = @{
        jdk8  = 'C:\Program Files\Java\jdk1.8.0_211'
        jdk11 = 'C:\Program Files\Java\jdk-11.0.27'
        jdk17 = 'C:\Program Files\Java\jdk-17.0.15'
        jdk22 = 'C:\Program Files\Java\jdk-22.0.2'
    }
}

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Functions

Get-JavaVersion

Lists all installed Java versions and highlights the one currently in use.

Parameters

• -IncludePathBinary – Optional. Shows the full path to the Java binary.
• -Target – Optional. Specifies which environment scope to read (Process, User, or Machine). Default: Process.

Example

Get-JavaVersion
Get-JavaVersion -IncludePathBinary
Get-JavaVersion -Target Machine

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Set-JavaVersion

Sets the desired Java version by updating the JAVA_HOME environment variable and modifying the PATH for the current session.

Parameters

• -Version – The Java version to set (must exist in $Global:JavaVersions).
• -Target – Optional. Defines the environment scope to update. Default: Process.

Example

Set-JavaVersion jdk22
Set-JAvaVersion jdk17 -Target Machine

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Requirements

• Windows 10 or 11
• PowerShell 5.1+ or PowerShell Core
• $Global:JavaVersions configured as shown above

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License

This project is licensed under CC BY-NC-SA 4.0

© marcio1002