Java EE (Java Enterprise Edition) General Discussion

This might be a little tricky.

I have an abstract servlet class I use as a front controller. It kind of looks like this:

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		this.doPreprocess(request, response);
	}
	
	public final void doPreprocess(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException {		
		
		HttpSession session = request.getSession();
						
		String labelId = request.getParameter("labelId");
		Integer lblId = null;
		
		if (labelId != null) lblId = new Integer(labelId);
		LabelData ld = new LabelData(lblId);
		request.setAttribute("allLabels", ld.getAllLabels());
		
		if (ld.getFilteredLabels() != null) {
			request.setAttribute("filteredLabels", ld.getFilteredLabels());
		}
		
		this.processRequest(request, response);
	}
	
	// Abstract method to be defined by extending class.
	public abstract void processRequest(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException;

I then extend it with this:

public class Home extends BaseController {
	
	public static final long serialVersionUID = 10; 

	public void processRequest(HttpServletRequest request, HttpServletResponse response) 
			throws ServletException, IOException {
		
		RequestDispatcher d = request.getRequestDispatcher("/home.jsp");
		d.forward(request, response);		
	}
}

The problem is, when I run it I get:

java.lang.IllegalStateException: Cannot forward after response has been committed

Does anyone know why? I am not even forwarding control to another servlet. I am simply extending the class.

Thanks.