if i disable showheader it failes calling the apex webservice but if i enable show headers it works on the sites page why is this?

Uncaught {faultcode:'UNKNOWN_EXCEPTION', faultstring:'UNKNOWN_EXCEPTION: Site under construction', }

Is there a equivalent  of sObject.get() for sObject's but for Classes? 

Need a way to dynamically retrieve the value of a class variable of an instantiated object as you don't know which variable you want until runtime. (REMEMBER: THIS IS NOT AN SOBJECT)

--- Psuedo Example ----

Class test {

     public name;

     public email;

}

Test t = new Test();

t.get('name')