Hi,
The stacktrace shows you that you are passing a LoadableDetachableModel
to info.sls.GMapPanel which contains a non-serializable reference
to info.sls.WicketApplication$3;
info.sls.WicketApplication$3 is an anonymous class inside your
WicketApplication, which contains a reference to it’s owning class
(WicketApplication).
Can you show us the code where you initialize the GMapsPanel and it’s
LoadableDetachableModel? That’s where we’ll probably find the culprit :-)
Usually this is caused by code like this:
MyServiceInsideApplication service = MyApplication.getService();
LoadableDetachableModel<X> ldm = new LoadableDetachableModel<X>() {
X load() {
return service.getX();
}
};
The above code will attempt to serialize MyServiceInsideApplication.
Code like this should be rewritten as follows:
LoadableDetachableModel<X> ldm = new LoadableDetachableModel<X>() {
X load() {
MyServiceInsideApplication service = MyApplication.getService();
return service.getX();
}
};
This way, there is no need to serialize the service, as it can be looked up
just-in-time when it is needed.
Met vriendelijke groet,
Kind regards,
Bas Gooren
Op 21 december 2019 bij 07:03:18, ShengChe Hsiao (front...@gmail.com)
schreef:
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?
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