code: public static synchronized List<Object> getAttributes(final String name) {
  		final List<Object> data = new ArrayList<>();
  
  		for (final String id : SESSIONS.keySet()) {
  			final HttpSession session = SESSIONS.get(id);
  			try {
  				final Object o = session.getAttribute(name);
  				data.add(o);
  				//CHECKSTYLE:OFF
  			} catch (final Exception e) {
  				// no data for this object.
  			}
  			//CHECKSTYLE:ON
  		}
  
  		return data;
  	}
docs: Return a list with all session values for a given attribute name.
  
  @return a list with all session values for a given attribute name.