How to make bash wrapper script to execute java jar that takes stdin and outputs to stdout

I’ve made a java program that takes input from stdin and returns output to stdout, which runs perfectly fine using:

cat inputfile | java -jar whatever.jar <args>

I want to make a bash wrapper script to put in my ~/bin so I can just run

cat inputfile | whatever

, which would perform exactly the same function.

How can I make a wrapper script that just passes stdin unmolested to the jar, while simultaneously receiving stdout back to echo to the CLI?