You will need Java installed if you want to:

• Install a Fabric server. Windows and Linux guides available
• Run Minecraft in MultiMC or Prism Launcher
• Run Technic Launcher
• Change the default “JAVA EXECUTABLE” to other than the bundled Java runtime in a Minecraft Launcher “Installation”

See the video tutorial by Kennas here or click the image below:

Open the Run dialog by using the Windows+R hotkey. Enter cmd in the textbox and click OK This will open a command window.

In the command window type java -version and press Enter

If Java is already installed you will see something like this:

If you already have Java installed and you want to update/replace it, you may want to uninstall any Java version(s) installed in your system using the Operating System normal procedure for uninstalling programs.

Download the Java 21 installer from here.

Choose the JDK .msi:

Open the JAVA installer you just downloaded:

When installing Java, change the way features will be installed:

Set the following features to “Entire feature will be installed on local hard drive”:

• Set JAVA_HOME variable
• JavaSoft (Oracle) registry keys

Finish the installation, then go back to STEP 1 to verify that Java was installed correctly.