Wicket: Die Seite kann bei Verwendung des DatePickers die Seite mit dem Konstruktor nicht instanziieren

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Expand view Topic review: Wicket: Die Seite kann bei Verwendung des DatePickers die Seite mit dem Konstruktor nicht instanziieren

by Anonymous » 09 Sep 2025, 12:03

Dieses Mal habe ich ein Problem beim Einlegen von Datumspacken auf meiner Wicket -Seite.

Code: Select all

public class StateDB extends BasePage {
private Date date = new Date();
public StateDB() {
Form form = new Form("form");
DateTextField birthDate = new DateTextField("birthDate", new PropertyModel(
this, "date"), new StyleDateConverter("S-", true));
PickDate datePicker = new PickDate();
datePicker.setShowOnFieldClick(true);
datePicker.setAutoHide(true);
birthDate.add(datePicker);
form.add(birthDate);
add(form);
}
}
< /code>

Wenn ich es auf dem Server ausführe und auf diese Seite verlinke. Ich erhalte Ausnahme:
< /p>

Last cause: org.apache.wicket.markup.head.HeaderItem
WicketMessage: Can't instantiate page using constructor 'public kz.company.myPackage.controller.StateDB()'. Might be it doesn't exist, may be it is not visible (public).
< /code>

Aber wie Sie sehen können, ist der Konstruktor meiner Klasse öffentlich < /p>

public StateDB() {
< /code>

Es gibt stacktrace < /p>

Complete stack:

org.apache.wicket.WicketRuntimeException: Can't instantiate page using constructor 'public kz.company.myPackage.controller.StateDB()'.  Might be it doesn't exist, may be it is not visible (public).
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:196)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:68)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:47)
at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:103)
at org.apache.wicket.request.handler.PageProvider.resolvePageInstance(PageProvider.java:264)
at org.apache.wicket.request.handler.PageProvider.getPageInstance(PageProvider.java:165)
at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:224)
at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.reflect.InvocationTargetException
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:177)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:68)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:47)
at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:103)
at org.apache.wicket.request.handler.PageProvider.resolvePageInstance(PageProvider.java:264)
at org.apache.wicket.request.handler.PageProvider.getPageInstance(PageProvider.java:165)
at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:224)
at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

java.lang.NoClassDefFoundError:  org/apache/wicket/markup/head/HeaderItem
at kz.company.myPackage.controller.StateDB.(StateDB.java:72)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at java.lang.reflect.Constructor.newInstance(Constructor.java:408)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:177)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:68)
at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:47)
at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:103)
at org.apache.wicket.request.handler.PageProvider.resolvePageInstance(PageProvider.java:264)
at org.apache.wicket.request.handler.PageProvider.getPageInstance(PageProvider.java:165)
at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:224)
at org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)

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