New to openshift and kubernetes

I have a secret in openshift, I have made it avaliable to the pod as an environment variable.

What is the best practice way to get that value into a properies file (java) before the containers service starts.

Is there a better way than using sed on the propertyfile before startup?

I am new to openshift and kubernetes.

I have a secret in openshift and made it avaliable to the pod as an environment variable.

What is the best practice to get that value into a properies file (java) before the containers service starts?

Is there a better way than using sed on the propertyfile before startup?