Java not finding environment variables defined in Jenkins

I have a snippet of code that is obtaining an environment variable as follows: System.getenv("MY_VAL")

locally on my windows machine this works fine.

However, on my Jenkins CI Server which is running CentOS I am encountering some issues

I have tried setting the value of MY_VAL through both the envinject plugin as well as the global jenkins settings

If i do a pre-build step to echo the value out, it works fine, however inside my java code this is not being resolved.

How do I get this to be resolved?