Hi Kirill, Yes, I know, but I think it a bit strange that this only happens on direct accessing the model and not when I assign the value to a variable and use String.valueOf on this.
GXT uses internally their FastMap, a HashMap that is based on JSNI if running on the client. This seems to be the problem. BTW, I switched to GWT 2.7.0 and the problem disappears. So there's something in GWT 2.8.0 that triggers the problem. Thanks anyway Norbert Am Mittwoch, 14. Dezember 2016 17:53:03 UTC+1 schrieb Kirill Prazdnikov: > > Hi > > It seems here you are trying to cast a native js object to java type. > > Sometimes GWT generates ClassCastException when I cast type > "@JsType(isNative=true) A" to type B which is also native type. This is > also kind of magic for me and I also have a strange workaround: write a > native method that does the cast by "return arg". > > I wrote about that earlier: > > https://groups.google.com/forum/#!topic/google-web-toolkit/bBW-RU5wEGs > > -Kirill > > > среда, 14 декабря 2016 г., 19:29:39 UTC+3 пользователь Norbert Bartels > написал: >> >> Hi all, >> >> I’m migrating our GWT app to GWT 2.8 as a PoC because we like to use the >> SDM. >> >> While testing the SDM I see some strange ClassCastExceptions in the >> console. >> >> We use gxt 2 and changed some things to make it work with GWT > 2.5.1. >> >> Here’s the error message (stacktrace) of the the class cast exception: >> >> java.lang.ClassCastException >> at Unknown.java_lang_Throwable_Throwable__V(Unknown Source) >> at Unknown.java_lang_Exception_Exception__V(Unknown Source) >> at Unknown.java_lang_RuntimeException_RuntimeException__V(Unknown Source) >> at Unknown.java_lang_ClassCastException_ClassCastException__V(Unknown >> Source) >> at >> Unknown.javaemul_internal_InternalPreconditions_checkCriticalType__ZV(Unknown >> Source) >> at Unknown.javaemul_internal_InternalPreconditions_checkType__ZV(Unknown >> Source) >> at >> Unknown.com_google_gwt_lang_Cast_castTo__Ljava_lang_Object_2Lcom_google_gwt_core_client_JavaScriptObject_2Ljava_lang_Object_2(Unknown >> Source) >> at >> Unknown.com_extjs_gxt_ui_client_widget_treegrid_TreeGridCellRenderer_getText__Lcom_extjs_gxt_ui_client_widget_treegrid_TreeGrid_2Lcom_extjs_gxt_ui_client_data_ModelData_2Ljava_lang_String_2IILjava_lang_String_2(Unknown >> Source) >> at >> Unknown.com_extjs_gxt_ui_client_widget_treegrid_TreeGridCellRenderer_render__Lcom_extjs_gxt_ui_client_data_ModelData_2Ljava_lang_String_2Lcom_extjs_gxt_ui_client_widget_grid_ColumnData_2IILcom_extjs_gxt_ui_client_store_ListStore_2Lcom_extjs_gxt_ui_client_widget_grid_Grid_2Ljava_lang_Object_2(Unknown >> Source) >> >> ... >> >> The code that triggers this exception is this ( >> http://grepcode.com/file/repo1.maven.org/maven2/com.extjs/gxt/2.3.1-gwt22/com/extjs/gxt/ui/client/widget/treegrid/TreeGridCellRenderer.java/#59 >> ): >> >> return String.valueOf(model.get(property)); >> >> My temporary solution to fix this is: >> >> Object obj = model.get(property); >> String.valueOf(obj); >> >> I already found several places where the class cast exception occurs and >> where this fix solves the problem, but I’m afraid that there’s something >> going wrong somewhere in GWT. >> >> Cheers, >> Norbert >> >> > -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
