How to call main method on class identified by String

I'm trying to call the main method on a Java class identified by a String. In the actual program, the class identifier will be a variable, but for the moment I'm trying this:

try {       
    Class c = Class.forName("Arena");

    Class[] aarg = new Class[1];  
    aarg[0] = String[].class;

    Method m = c.getMethod("main", aarg); // Needs parameter class list
    m.invoke(newargs);
}           
catch (Exception e) {
    System.err.println(e);      
}

First, I get a compiler warning (Athena is the name of the class I'm currently working in):

Note: Athena.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Then on testing I get this exception:

java.lang.IllegalArgumentException: wrong number of arguments

I feel like the primary thing is I don't know how to identify the parameter of main() as an array of the String class (failed to find an example of that), but maybe I'm missing more than that.