I'm a wicket newbie, but have been making relatively steady progress on a new webapp.
I have an ExternalLink which is part of a Panel, and I want to make it notify the server asynchronously when the user clicks on it, so I've added an AjaxEventBehavior as follows: ExternalLink titleLink = new ExternalLink("title", link, title); titleLink.add(new AjaxEventBehavior("onclick") { protected void onEvent(AjaxRequestTarget target) { log.debug("Clicked title"); } }); I do this and suddenly I start getting "WicketMessage: Internal error cloning object. Make sure all dependent objects implement Serializable. ..." messages for all sorts of different classes, when I make one Serializable per the error messages suggestion, it complains about another one. What is going on? Why does my attempt to use Ajax suddenly mean that all of these classes need to be Serializable? Thanks, Ian. PS. Here is an example of the full error: WicketMessage: Internal error cloning object. Make sure all dependent objects implement Serializable. Class: thoof.Index Root cause: java.io.NotSerializableException: thoof.model.Story at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1151) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at java.util.ArrayList.writeObject(ArrayList.java:570) at java.lang.reflect.Method.invoke(Method.java:589) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1456) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1504) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1504) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1333) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1141) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1504) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1387) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1145) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326) at wicket.protocol.http.HttpSessionStore.setAttribute(HttpSessionStore.java:57) at wicket.Session.setAttribute(Session.java:930) at wicket.PageMap.put(PageMap.java:526) at wicket.Session.touch(Session.java:718) at wicket.Page.renderPage(Page.java:416) at wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:226) at wicket.request.compound.DefaultResponseStrategy.respond(DefaultResponseStrategy.java:49) at wicket.request.compound.AbstractCompoundRequestCycleProcessor.respond(AbstractCompoundRequestCycleProcessor.java:66) at wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:858) at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:885) at wicket.RequestCycle.step(RequestCycle.java:966) at wicket.RequestCycle.steps(RequestCycle.java:1040) at wicket.RequestCycle.request(RequestCycle.java:454) at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:216) at javax.servlet.http.HttpServlet.service(HttpServlet.java:740) at javax.servlet.http.HttpServlet.service(HttpServlet.java:853) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:358) at org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:294) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567) at org.mortbay.http.HttpContext.handle(HttpContext.java:1807) at org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:525) at org.mortbay.http.HttpContext.handle(HttpContext.java:1757) at org.mortbay.http.HttpServer.service(HttpServer.java:879) at org.mortbay.http.HttpConnection.service(HttpConnection.java:789) at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:960) at org.mortbay.http.HttpConnection.handle(HttpConnection.java:806) at org.mortbay.http.SocketListener.handleConnection(SocketListener.java:218) at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:331) at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:520) Complete stack: wicket.WicketRuntimeException: Internal error cloning object. Make sure all dependent objects implement Serializable. Class: thoof.Index at wicket.protocol.http.HttpSessionStore.setAttribute(HttpSessionStore.java:63) at wicket.Session.setAttribute(Session.java:930) at wicket.PageMap.put(PageMap.java:526) at wicket.Session.touch(Session.java:718) at wicket.Page.renderPage(Page.java:416) at wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:226) at wicket.request.compound.DefaultResponseStrategy.respond(DefaultResponseStrategy.java:49) at wicket.request.compound.AbstractCompoundRequestCycleProcessor.respond(AbstractCompoundRequestCycleProcessor.java:66) at wicket.RequestCycle.doProcessEventsAndRespond(RequestCycle.java:858) at wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:885) at wicket.RequestCycle.step(RequestCycle.java:966) at wicket.RequestCycle.steps(RequestCycle.java:1040) at wicket.RequestCycle.request(RequestCycle.java:454) at wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:216) ------------------------------------------------------------------------- Take Surveys. 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