code: public ChangesetInfo get(long id)
  	{
  		SingleElementHandler<ChangesetInfo> handler = new SingleElementHandler<>();
  		String query = CHANGESET + "/" + id + "?include_discussion=true";
  		try
  		{
  			osm.makeAuthenticatedRequest(query, null, new ChangesetParser(handler));
  		}
  		catch(OsmNotFoundException e)
  		{
  			return null;
  		}
  		return handler.get();
  	}
docs: Get the changeset information with the given id. Always includes the changeset discussion.
  
  @param id changeset id
  @throws OsmAuthorizationException if not logged in
  @return info for the given changeset. Null if it does not exist.