/*
* Read Preference of portlet placed on another page.
*Example -1 : If Preferences of portlet is unique per layout
*/
PortletPreferences pageCommentsPref = null;
String portletId = PortletKeys.PAGE_COMMENTS;
String defaultPreferences = null;
long plid = GetterUtil.getLong(serviceContext.getPlid());//Plid of page where portlet is placed
  try {
	/*
	* Preferences are unique per layout . Preferences won't be shared between pages
	*/
	pageCommentsPref = portletPreferencesLocalService.getPreferences(companyId, 0,
	PortletKeys.PREFS_OWNER_TYPE_LAYOUT, plid, portletId, defaultPreferences);

   } catch (SystemException e) {
	_log.error(e.getMessage());
   }


/*
* Read Preference of portlet placed on another page.
* Example -2 : If Preference of portlet is unique per layout
*/
PortletPreferences blogPreferences = null;
long ownerId = groupId;
String defaultPreferences = null;
/*
*Preferences are unique per group. If multiple blog portlet places in group at multiple pages
 then preferences will be shated between them.
*/
String portletId = PortletKeys.BLOGS;
long plid=PortletKeys.PREFS_PLID_SHARED //Plid 0 because preferences are unique per group

  try {
       blogPreferences = portletPreferencesLocalService.getPreferences(companyId, ownerId,
	PortletKeys.PREFS_OWNER_TYPE_GROUP, plid, portletId, defaultPreferences);


    } catch (SystemException e) {
	_log.error(e.getMessage());
    }