Oh My JVM

Overview

TL;DR: The benefit of Oh My JVM is you can switch different JDKs without refreshing your environments.

Oh My JVM is a command-line tool for Windows to manage multiple JDKs written in Kotlin Native inspired by nvm-windows.

Usage

Add or create JAVA_HOME with %USERPROFILE%\.ojvm\jdk\current to your system or user environment variables.

Add %JAVA_HOME%\bin to your system or user PATH environment variable.

Make sure you have cleaned your environment variables and let Oh My JVM to manage your JDKs.

Out-of-box

Oh My JVM can automatically detect and add supported JDKs.

Officially Supported JDKs

• Eclipse Temurin
• Zulu

If you want to add other JDKs, please see Manually add and use JDKs.

If you want to help us to support more JDKs, please create an issue or pull request.

Assume you have the following JDKs being installed. In C:\Program Files\Eclipse Adoptium:

.
├── jdk-11.0.17.8-hotspot
├── jdk-17.0.6.10-hotspot
├── jdk-18.0.2.101-hotspot
└── jdk-8.0.362.9-hotspot

Oh My JVM has automatically added those JDKs. Run ojvm list to list them.

Alias: temurin-11.0.17.8
Path: C:\Program Files\Eclipse Adoptium\jdk-11.0.17.8-hotspot
Version: 11.0.17.8

Alias: temurin-17.0.6.10
Path: C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot
Version: 17.0.6.10

Alias: temurin-18.0.2.101
Path: C:\Program Files\Eclipse Adoptium\jdk-18.0.2.101-hotspot
Version: 18.0.2.101

Alias: temurin-8.0.362.9
Path: C:\Program Files\Eclipse Adoptium\jdk-8.0.362.9-hotspot
Version: 8.0.362.9

Switch JDK

Now, you can switch different JDKs.

ojvm use temurin-11.0.17.8

java -version
openjdk version "11.0.17" 2022-10-18
OpenJDK Runtime Environment Temurin-11.0.17+8 (build 11.0.17+8)
OpenJDK 64-Bit Server VM Temurin-11.0.17+8 (build 11.0.17+8, mixed mode)

# Or you can use the full path
ojvm use "C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot"

java -version
openjdk version "17.0.6" 2023-01-17
OpenJDK Runtime Environment Temurin-17.0.6+10 (build 17.0.6+10)
OpenJDK 64-Bit Server VM Temurin-17.0.6+10 (build 17.0.6+10, mixed mode, sharing)

Manually add and use JDKs

Assume you have the following JDKs being installed. In C:\Program Files\Eclipse Adoptium:

.
├── jdk-11.0.17.8-hotspot
├── jdk-17.0.6.10-hotspot
├── jdk-18.0.2.101-hotspot
└── jdk-8.0.362.9-hotspot

ojvm add "C:\Program Files\Eclipse Adoptium" --depth 1

Added JDK: C:\Program Files\Eclipse Adoptium\jdk-11.0.17.8-hotspot
Added JDK: C:\Program Files\Eclipse Adoptium\jdk-17.0.6.10-hotspot
Added JDK: C:\Program Files\Eclipse Adoptium\jdk-18.0.2.101-hotspot
Added JDK: C:\Program Files\Eclipse Adoptium\jdk-8.0.362.9-hotspot

Go to Switch JDK to do the next step.