java -javaagent:./agent/target/agent-1.0-SNAPSHOT-jar-with-dependencies.jar -jar ./application/target/application-1.0-SNAPSHOT-jar-with-dependencies.jar

Rappel javassist

special variable	description
$0, $1, $2, ...	this and actual parameters
$args	An array of parameters. The type of $args is Object[].
$$	All actual parameters.

m.setBody("{" +
        "     System.out.println(\"args: \"+$1+\" et \"+$2);" +
        "     int c = 5;" +
        "     System.out.println(\"c=\"+c);" +
        "     return $1 + $2;" +
        "  }");