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)
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