提问：Java5泛型的T.class的获取

public class BaseHelper<T> {
	private T object = null;
	private HttpServletRequest request;

	public BaseHelper(HttpServletRequest request, String key, Class<T> clazz, String[] args, Class<String>... argTypes) {
		this.request = request;
		
		object = (T)request.getSession().getAttribute(key);
		if(object == null){
		  Constructor constructor ;
		  try{
			constructor = clazz.getConstructor(argTypes);
			object = constructor.newInstance(args);
		  }
		  catch(NoSuchMethodException e){}
		  catch(IllegalAccessException e){}		
		  catch(InvocationTargetException e){}
		  catch(InstantiationException e){}
		}
	}
	
	public T get(){
		return object;
	}
}