java.io.NotSerializableException by using DataScroller

[eugenbesel]

Hello Everyone,

I took, the class DataScrollerBean from example

http://livedemo.exadel.com/richfaces-demo/richfaces/dataTableScroller.jsf?tab=usage&cid=5068036

and implement it in mycode.

so when I start the application I get the error:

SCHWERWIEGEND: Error Rendering View[/pages/extendedDatatable.xhtml]
java.io.NotSerializableException: de.fsd.bean.DataScrollerBean
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1156)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
    at java.util.HashMap.writeObject(HashMap.java:1001)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1461)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1392)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1150)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1338)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1146)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:326)
    at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:281)
    at javax.faces.render.ResponseStateManager.writeState(ResponseStateManager.java:166)
    at org.ajax4jsf.application.AjaxStateManager.writeState(AjaxStateManager.java:296)
    at org.ajax4jsf.application.AjaxStateManager.writeState(AjaxStateManager.java:258)
    at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:622)
    at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
    at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)

I use extendedDataTable and columns. that's why my data array looks like List<ArrayList<String>>

do you have any Idea why this exception occurs??

thank you

[eugenbesel]

I think which component cause this behavior:

<a4j:keepAlive beanName="dataScrollerBean" ajaxOnly="true"/>

when I remove this component, then the table is shown.

I took this component from the example of DataScroller. I want that the data of the table is shown on the first page while the table will generated.

is this correct component ??

[ilya_shaikovsky]

I do not sure that completelly get why you using keepAlive. Could you please share some code? Also pay attention that components bindings (if you're using them) should not be session scoped or kep alive. Them should be request scoped only.

[eugenbesel]

I found this code in example in SVN Repository in customScroller.xhtml.

you can find my code in atachment.

thank you

[ilya_shaikovsky]

yes ,your object should implements serializable as it's stored into view betwen requests. (not sure why it was removed from documentation)

[eugenbesel]

which object do you mean on this place?

my Data Object is List<ArrayList<String>>

I though that this object is already serializable.

[ilya_shaikovsky]

I mean table scroller bean which marked with keep alive.