How to set java_home from the ubuntu shell on wsl2?

To set the JAVA_HOME environment variable from the Ubuntu shell on WSL2, you can follow these steps:

Determine the path to the Java installation directory by running the following command:

sudo update-alternatives --config java

This will list all available Java installations, along with their corresponding directories. Choose the desired installation by typing the number next to it, then press Enter.

Export the JAVA_HOME environment variable by adding the following line to your ~/.bashrc file:

export JAVA_HOME=path/to/java/installation

Replace path/to/java/installation with the path to the Java installation directory that you determined in step 1.

Reload the bashrc file by running the following command:

source ~/.bashrc

Test that the JAVA_HOME variable has been set correctly by running the following command:

echo $JAVA_HOME

This should output the path to the Java installation directory.

Note that these steps will only set the JAVA_HOME variable for the current user. To set it system-wide, you will need to add the export line to the /etc/environment file instead of the bashrc file.