Hi, Instead of keeping a reference to WebApplication just use Application.get();: it is bound to thread as a threadlocal. If you need your specific instance you can always add
public static MyWebApplication getInstance() { return (MyWebApplication) Application.get(); } to class MyWebApplication, This way you can always call MyWebApplication.getInstance() and you don't need to keep a reference to it as a field on base page. On Sat, Dec 21, 2019 at 9:03 AM ShengChe Hsiao <front...@gmail.com> wrote: > Dear all > I faced a strange exception, the error message: > > A problem occurred while checking object with type: > info.sls.WicketApplication > > Field hierarchy is: > > 1 [class=info.sls.MapPage, path=1] > > private java.lang.Object org.apache.wicket.MarkupContainer.children > [class=java.util.ArrayList] > > private java.lang.Object > org.apache.wicket.MarkupContainer.children[write:27][write:28] > [class=org.apache.wicket.markup.html.form.StatelessForm, > path=1:formGMapSelect] > > private java.lang.Object org.apache.wicket.MarkupContainer.children > [class=java.util.ArrayList] > > private final java.lang.String > > org.apache.wicket.markup.html.form.ChoiceRenderer.idExpression[write:8][write:11] > [class=org.apache.wicket.ajax.markup.html.form.AjaxSubmitLink, > path=1:formGMapSelect:btnSelect] > > final info.sls.GMapPanel info.sls.MapPage$1.val$gMapPanel > [class=info.sls.GMapPanel, path=1:gmaps] > > java.lang.Object org.apache.wicket.Component.data > [class=[Ljava.lang.Object;] > > java.lang.Object org.apache.wicket.Component.data[0] > [class=org.apache.wicket.model.LoadableDetachableModel] > > final info.sls.WicketApplication > info.sls.WicketApplication$3.this$0 [class=info.sls.WicketApplication] > <----- field that is causing the problem > > > I use transient with WicketApplication in my BasePage, but the issue > continued..... > > > private transient WicketApplication wicketApplication; > > > > Any suggestions? > -------------------------------------------------------------------- > -----------------------------------> > To boldly go where no man has gone before. > -------------------------------------------------------------------- > -----------------------------------> > We do this not because it is easy. We do this because it is hard. > ----------------------------------------------------------------- > --------------------------------------> > If I have seen further it is by standing on the shoulders of giants. > ---------------------------------------------------------- > ---------------------------------------------> > front...@gmail.com > > ---------------------------------------------------------------------------------------------> > -- Regards - Ernesto Reinaldo Barreiro