我得到这样的堆栈跟踪:java.lang.NoClassDefFoundError:sun/reflect/GeneratedMethodAccessor1atsun.reflect.GeneratedMethodAccessor1.(UnknownSource)atsun.reflect.NativeConstructorAccessorImpl.newInstance0(NativeMethod)atsun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)

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