public OverloadedMethodModel(Object object,
    MethodMap methodMap) 
{
        this.object = object;
        this.methodMap = methodMap;
}

 public Object exec(List arguments) throws TemplateModelException 
{
        MemberAndArguments maa = methodMap.getMemberAndArguments(arguments);
        Method method = (Method)maa.getMember();
        try {
            return methodMap.getWrapper().invokeMethod(object, method, maa.getArgs());
        }
        catch(Exception e)
        {
            while(e instanceof InvocationTargetException)
            {
                Throwable t = ((InvocationTargetException)e).getTargetException();
                if(t instanceof Exception)
                {
                    e = (Exception)t;
                }
                else
                {
                    break;
                }
            }
            if((method.getModifiers() & Modifier.STATIC) != 0)
            {
                throw new TemplateModelException("Method " + method + 
                        " threw an exception", e);
            }
            else
            {
                StringBuffer buf = new StringBuffer();
                Object[] args = maa.getArgs();
                for(int i = 0; i <  args.length; ++i)
                {
                    Object arg = args[i];
                    buf.append(arg == null ? "null" : arg.getClass().getName()).append(',");
                }
                throw new TemplateModelException("Method " + method + 
                        " threw an exception when invoked on " + object + 
                        " with arguments of types [" + buf + "]", e);
            }
        }
}

Invokes the method, passing it the arguments from the list. The actual method to call from several overloaded methods will be chosen based on the classes of the arguments.

 public TemplateModel get(int index) throws TemplateModelException 
{
        return (TemplateModel) exec(Collections12.singletonList(
                new SimpleNumber(new Integer(index))));
}

 public int size() throws TemplateModelException 
{
        throw new TemplateModelException("?size is unsupported for: " + 
                getClass().getName());
}