How to load array in JSP getAttribute
 

I am new at and using Struts.
I'm not sure how to do the following:
I am loading an Arraylist of TitleNames.
Each TitleName is related to a List of pictures (MyList).
MyList is a class that I created that contains all the fields needed to describe the picture.

In my code at the top of my jsp page, I have:
ArrayList tNames = (ArrayList) request.getAttribute("TitleNames");

I would like to do something like:

for(int i=0;i<tNames.size();i++)

{

  ArrayList tPics = (ArrayList) request.getAttribute("PicNames", tNames.getId());

  for(int j=0;j<tPics.size();i++)

  {

    out.println(tPics.getName() + "<br>");

  }

}

But I am not sure how to do:
ArrayList tPics = (ArrayList) request.getAttribute("PicNames", tNames.getId());