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private static String addPortlet(final long p_userId, final Layout p_layout, final String p_portletId, final String p_columnId, final int p_position, final boolean p_checkPermission)
                throws PortalException, SystemException
{
    if (p_layout.isTypePortlet()) {
        final LayoutTypePortlet layoutTypePortlet = (LayoutTypePortlet) p_layout.getLayoutType();
 
        final String portletId = layoutTypePortlet.addPortletId(p_userId, p_portletId, p_columnId, p_position, p_checkPermission);
        if (portletId != null) {
            final String rootPortletId = PortletConstants.getRootPortletId(portletId);
            final String portletPrimaryKey = PortletPermissionUtil.getPrimaryKey(p_layout.getPlid(), portletId);
            ResourceLocalServiceUtil.addResources(p_layout.getCompanyId(), p_layout.getGroupId(), 0, rootPortletId, portletPrimaryKey, true, true, true);
            LayoutLocalServiceUtil.updateLayout(p_layout.getGroupId(), p_layout.isPrivateLayout(), p_layout.getLayoutId(), p_layout.getTypeSettings());
        }
        return portletId;
    }
 
    return null;
}
 
private static void addNestedPortlet(final PortletRequest p_request) throws PortalException, SystemException {
    final ThemeDisplay themeDisplay = (ThemeDisplay) p_request.getAttribute(WebKeys.THEME_DISPLAY);
    final Layout layout = themeDisplay.getLayout();
    long userId = themeDisplay.getUserId();
 
    //create nested portlet and add it to "column-1"
    final String nestedPortletId = addPortlet(userId, layout, "118", "column-1", -1, false);
 
    //this will be used to target nested portlet's columns
    final String nestedColumnPrefix = "_" + nestedPortletId + "__";
 
    //default page layout (used by nested portlet) has two columns
    //we'll add two portlets (in this example two iframe portlets), one portlet to each column
    addPortlet(userId, layout, "48", nestedColumnPrefix + "column-1", -1, false);
    addPortlet(userId, layout, "48", nestedColumnPrefix + "column-2", -1, false);
}

private static String addPortlet(final long p_userId, final Layout p_layout, final String p_portletId, final String p_columnId, final int p_position, final boolean p_checkPermission)
                throws PortalException, SystemException
{
    if (p_layout.isTypePortlet()) {
        final LayoutTypePortlet layoutTypePortlet = (LayoutTypePortlet) p_layout.getLayoutType();

        final String portletId = layoutTypePortlet.addPortletId(p_userId, p_portletId, p_columnId, p_position, p_checkPermission);
        if (portletId != null) {
            final String rootPortletId = PortletConstants.getRootPortletId(portletId);
            final String portletPrimaryKey = PortletPermissionUtil.getPrimaryKey(p_layout.getPlid(), portletId);
            ResourceLocalServiceUtil.addResources(p_layout.getCompanyId(), p_layout.getGroupId(), 0, rootPortletId, portletPrimaryKey, true, true, true);
            LayoutLocalServiceUtil.updateLayout(p_layout.getGroupId(), p_layout.isPrivateLayout(), p_layout.getLayoutId(), p_layout.getTypeSettings());
        }
        return portletId;
    }

    return null;
}

private static void addNestedPortlet(final PortletRequest p_request) throws PortalException, SystemException {
    final ThemeDisplay themeDisplay = (ThemeDisplay) p_request.getAttribute(WebKeys.THEME_DISPLAY);
    final Layout layout = themeDisplay.getLayout();
    long userId = themeDisplay.getUserId();

    //create nested portlet and add it to "column-1"
    final String nestedPortletId = addPortlet(userId, layout, "118", "column-1", -1, false);

    //this will be used to target nested portlet's columns
    final String nestedColumnPrefix = "_" + nestedPortletId + "__";

    //default page layout (used by nested portlet) has two columns
    //we'll add two portlets (in this example two iframe portlets), one portlet to each column
    addPortlet(userId, layout, "48", nestedColumnPrefix + "column-1", -1, false);
    addPortlet(userId, layout, "48", nestedColumnPrefix + "column-2", -1, false);
}