几天前，我收到了这个NullPointerException的支持票:com.google.gwt.user.server.rpc.UnexpectedException:Servicemethod'publicabstractcom.redacted.SalesResponsePaginationcom.redacted.StatisticsService.findSalesData(com.redacted.ConfStats)throwscom.redacted.AsyncException'threwanunexpectedexception:java.lang.NullPoi