br.addElement(contentType);
        br.addItem("Boundary Size");
        br.addElement(boundarySize);
        br.addItem("Limit Size");
        br.addElement(limitSize);
        final String msg = br.buildExceptionMessage();
        throw new Forced404NotFoundException(msg, UserMessages.empty()); // heavy attack!? so give no page to tell wasted action
    }

    protected DiskFileItemFactory createDiskFileItemFactory() {