All,
I just ran into an unpleasant surprise. I had a Wicket page working
nicely. The page keeps a state of ExampleValue objects in a map. Those
instance have members of type File, which as you know are serializable.
I wanted to upgrade the class in support the new Java NIO Path (which is
much nicer than File). As soon as I did, I got this Wicket error:
2014-09-06 16:08:22 ERROR (JavaSerializer) [2014-09-06 16:08:22,433] -
org.apache.wicket.serialize.java.JavaSerializer.serialize(JavaSerializer.java:95):
Error serializing object class com.example.ExamplePage [object=[Page
class = com.example.ExamplePage, id = 4, render count = 7]]
org.apache.wicket.core.util.objects.checker.CheckingObjectOutputStream$ObjectCheckException:
The object type is not Serializable!
A problem occurred while checking object with type: sun.nio.fs.WindowsPath
Field hierarchy is:
4 [class=com.example.ExamplePage, path=4]
private java.lang.Object org.apache.wicket.MarkupContainer.children
[class=[Ljava.lang.Object;]
java.lang.Object org.apache.wicket.Component.data[4]
[class=org.apache.wicket.markup.html.form.Form, path=4:form]
private java.lang.Object
org.apache.wicket.MarkupContainer.children [class=[Ljava.lang.Object;]
private java.lang.Object
org.apache.wicket.MarkupContainer.children[3]
[class=org.apache.wicket.markup.repeater.data.DataView,
path=4:form:ExampleValue]
private java.lang.Object
org.apache.wicket.MarkupContainer.children
[class=org.apache.wicket.markup.repeater.Item, path=4:form:ExampleValue:6]
java.lang.Object org.apache.wicket.Component.data
[class=org.apache.wicket.model.Model]
private java.io.Serializable
org.apache.wicket.model.Model.object
[class=com.example.ExamplePage$ExampleValue]
private final java.nio.file.Path
com.example.ExamplePage$ExampleValue.path [class=sun.nio.fs.WindowsPath]
<----- field that is causing the problem
Yes, I could write a lot of custom serialization code to save and load
sun.nio.fs.WindowsPath, but it's a shame such a common (and
future-oriented) class can't be used in Wicket pages. Any way Wicket
could work around this?
Garret
