maven exec:java run class file within jar

I have my code packaged into a jar

The jar is packaged ok.

jar -tfv target/test-1.0-SNAPSHOT.jar

com/
com/codevalid/
com/codevalid/App.class
log4j.xml
META-INF/maven/com.codevalid/test/pom.xml
META-INF/maven/com.codevalid/test/pom.properties

I can execute them when they are present as individual class files using exec:java

How to run class file within jar using maven exec:java?