I solve this problem by making the BufferedImage transient.
2013/5/27 Jonas <barney...@gmail.com>
> Well, you can't serialize the BufferedImage, but maybe you can serialize
> whatever data you've used to render BufferedImage's contents,
> i.e. instead of saving the image, save whatever is necessary to recreate
> the image?
> Or, you could store the BufferedImage's content to an actual image file
> (using ImageIO)?
>
>
> On Wed, May 22, 2013 at 5:39 AM, smallufo <small...@gmail.com> wrote:
>
> > Thanks.
> > But in my example , I cannot modify BufferedImage (to add a no-arg
> > constructor)
> > What should I do if I want to output a BufferedImage (and make back
> button
> > work) ?
> >
> >
> >
> > 2013/5/14 Jonas <barney...@gmail.com>
> >
> > > This could only work if BufferedImage itself had a no-arg constructor.
> > > It is it the first non-serializable class in the hierarchy that needs
> to
> > > have it,
> > > not the first serializable one, like in your example.
> > > Besides, you would still lose all data stored in the BufferedImage's
> > fields
> > > (i.e.
> > > the image stored in it).
> > >
> > >
> > > On Mon, May 13, 2013 at 7:15 PM, smallufo <small...@gmail.com> wrote:
> > >
> > > > Today I encountered one famous deserialization problem :
> > > > InvalidClassException : no valid constructor
> > > >
> > > > I googled and found some solution , but all are in-vain.
> > > > The solution says the first non-serializable super class should
> define
> > a
> > > > no-arg constructor.
> > > >
> > > > But I try to define a no-arg constructor to EACH class of the
> > HIERARCHY ,
> > > > and EACH class implements Serializable... (which is not necessary ,
> > but I
> > > > want to make it simple , to pinpoint the problem)
> > > >
> > > > My base class is an abstract class extends BufferedImage (java 2D)
> > > > while BufferedImage is not Serializable
> > > > So I make my abstract class implements Serializable and define a
> no-arg
> > > > default constructor.
> > > >
> > > > The total hierarchy is :
> > > > public abstract class AbstractChart extends BufferedImage implements
> > > > Serializable {
> > > > public AbstractChart() { // I try to remove this
> constructor
> > ,
> > > > but in vain
> > > > super(0 , 0, TYPE_INT_ARGB);
> > > > }
> > > > }
> > > >
> > > > and first child class :
> > > >
> > > > public class ChildChart extends AbstractChart implements
> Serializable {
> > > > public ChildChart() {
> > > > super(); // or not calling super()
> > > > }
> > > > }
> > > >
> > > > and the grandson class :
> > > >
> > > > public class GrandsonChart extends ChildChart implements
> Serializable {
> > > > public GrandsonChart() {
> > > > super(); // or not calling super()
> > > > }
> > > > }
> > > >
> > > > No matter I calls super() in ChildChart or GrandsonChart ,
> > > >
> > > > Caused by: java.io.InvalidClassException: foobar.GrandsonChart; no
> > valid
> > > > constructor
> > > >
> > > > It happens when I click a button ,use ajax to paint this
> GrandsonChart
> > ,
> > > > and click another page , and use browser back .
> > > > The browser will be redirected to /context/wicket/page?xxx (The error
> > > page)
> > > > The screen shows :
> > > > Could not deserialize object using:
> > > > class
> > > >
> > > >
> > >
> >
> org.apache.wicket.serialize.java.JavaSerializer$ClassResolverObjectInputStream
> > > >
> > > > and in the console log , I can see this InvalidClassException is
> > thrown.
> > > >
> > > > Any way to solve this problem ?
> > > > (I've already added default no-arg constructor , and make each class
> > > > implements Serializable , but still not working )
> > > >
> > > > environment :
> > > > Wicket version : 6.7
> > > > Resin 4.0.25
> > > > Java HotSpot(TM) 64-Bit Server VM 20.4-b02-402, 64, mixed mode, Apple
> > Inc
> > > > (It happens on Linux JDK too)
> > > >
> > >
> >
>
