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 google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
