How to set Environment variable option while running JAR?

Question

I have a JAR which accepts environment variable options. When I run the main class manually by setting run configuration, I provide environment variable as : KERBOROS_KEYTAB_LOC="location of the keytab file"

Now I need to set these options while running the JAR. How I can set that? I tried below option but it is not working.

java -DKERBOROS_KEYTAB_LOC="location of the keytab file" -jar jarfile.jar

Answer 1

On linux, execute

$ export KERBOROS_KEYTAB_LOC="location of the keytab file"

On windows

C:\>SomeDir>set KERBOROS_KEYTAB_LOC="location of the keytab file"

then run the jar as always

Answer 2

For Windows

• Put this into a .bat file

    @echo off
    setlocal enabledelayedexpansion

    :: Load environment variables from .env file
    for /f "delims=" %%i in (Variables.env) do (
        set "%%i"
    )

    :: Run your jar
    java -jar YourJarFileName.jar

    :: Pause the script when exit occurs and wait for a key press
    echo Press any key to exit...
    pause >nul

    endlocal

• Change Variables.env to your name.env file where you have defined your env variables
• Lastly, change YourJarFileName.jar
• Run this .bat file.

Note: Keep all these files, 3 of them in the same directory.