Re: [kryo] com.esotericsoftware.kryo.KryoException: java.lang.ClassCastException: com.xxx.transformer.kryo.Employee cannot be cast to java.lang.Integer

[Nate]

Is it possible your _views object has a View key? Are you running from SVN? A recent fix may be related to your problem.

-Nate

On Tue, Aug 21, 2012 at 5:24 PM, Ramki Dirisala <ramki.d...@gmail.com> wrote:

Hi,

I am new Kryo and exploring to use in my project. but when i try one POC, i am getting a strange error. i am putting all my classes.

1) public class CopyOnWriteMap<K,V> extends AbstractMap<K,V> implements Map<K,V>, Comparator<Entry<K,V>> {

    private Map<? extends K,? extends V> backingMap = null;

    private ArrayList<SimpleEntry<K,V>> store = null

    ............... some getters/setters

   }

2) public class View implements Serializable{

    private CopyOnWriteMap<String,String> _attributes = new CopyOnWriteMap<String,String>();

    private String _viewID;

    ............... some getters/setters

 }

3) public class Page implements Serializable {

    private CopyOnWriteMap<String,String> _attributes = new CopyOnWriteMap<String,String>();

    private CopyOnWriteMap<String, View> _views = new CopyOnWriteMap<String, View>();

        ............... some getters/setters

  public View getMutableView(final String viewID) {

        View view = _views.get(viewID);

        if (!_views.containsLocalKey(viewID)) {

            if (view == null) {

                view = new View();

                view.setViewID(viewID);

            } else {

                view = view.createChild();

            }

            _views.put(viewID, view);

        }

        return view;

    }

  }

4) public class KryoSerializerUtil {

     public static void main(String[] args) throws Exception {

             Page page = new Page();

        page.getMutableView("ramki");

        

        Kryo kryo = new Kryo();

        kryo.register(CopyOnWriteMap.class);

        kryo.register(View.class);

        kryo.register(Page.class); 

        Output output = new Output(new FileOutputStream("file.bin"));

        kryo.writeClassAndObject(output, page);

}

}

so when i try to run above code i am getting following error

Exception in thread "main" com.esotericsoftware.kryo.KryoException: java.lang.ClassCastException: com.apn.transformer.View cannot be cast to java.lang.String

Serialization trace:

_views (com.apn.transformer.Page)

at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:495)

at com.esotericsoftware.kryo.serializers.FieldSerializer.write(FieldSerializer.java:213)

at com.esotericsoftware.kryo.Kryo.writeClassAndObject(Kryo.java:571)

at com.apn.transformer.kryo.KryoSerializerUtil.main(KryoSerializerUtil.java:97)

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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Caused by: java.lang.ClassCastException: com.apn.transformer.View cannot be cast to java.lang.String

at com.esotericsoftware.kryo.serializers.DefaultSerializers$StringSerializer.write(DefaultSerializers.java:146)

at com.esotericsoftware.kryo.Kryo.writeObjectOrNull(Kryo.java:552)

at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:83)

at com.esotericsoftware.kryo.serializers.MapSerializer.write(MapSerializer.java:17)

at com.esotericsoftware.kryo.Kryo.writeObject(Kryo.java:504)

at com.esotericsoftware.kryo.serializers.FieldSerializer$ObjectField.write(FieldSerializer.java:474)

could someone help me to find out the problem?

Thanks,

Ramki      

  

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[Ramki Dirisala]

Hi Nate,

Thanks for quick response. Key always a String not View Object? intrestingly, if i make View Class as Final, it is working fine.

i am usingkryo 2.19.

Thanks,

Ramki

--
Thanks,

Ramki.

[Nate]

I'm guessing your problem is fixed in SVN. I'll try to do a release tomorrow.

-Nate

[Ramki Dirisala]

ok great.

-RK

[Ramki Dirisala]

Hi Nate,

My previous problem solved with Kryo2.20. when i try to deserialize the object back, i am getting following exception.

com.esotericsoftware.kryo.KryoException: Class cannot be created (missing no-arg constructor): java.util.Map

at com.esotericsoftware.kryo.Kryo.newInstantiator(Kryo.java:1048)

at com.esotericsoftware.kryo.Kryo.newInstance(Kryo.java:1060)

at com.esotericsoftware.kryo.serializers.MapSerializer.create(MapSerializer.java:93)

at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:97)

at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:17)

at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:629)

at com.apn.transformer.kryo.KryoSerializerUtil.read(KryoSerializerUtil.java:57)

at com.apn.transformer.TrafficConfigTransformer.transform(TrafficConfigTransformer.java:48)

at com.apn.transformer.TrafficConfigTransformer.main(TrafficConfigTransformer.java:64)

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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Not sure might be the issue.

Thanks,

Ramki

On Tue, Aug 21, 2012 at 7:13 PM, Nate <nathan...@gmail.com> wrote:

--
Thanks,

Ramki.

[Nate]

On Fri, Aug 24, 2012 at 10:14 AM, Ramki Dirisala <ramki.d...@gmail.com> wrote:

Hi Nate,

My previous problem solved with Kryo2.20. when i try to deserialize the object back, i am getting following exception.

com.esotericsoftware.kryo.KryoException: Class cannot be created (missing no-arg constructor): java.util.Map

at com.esotericsoftware.kryo.Kryo.newInstantiator(Kryo.java:1048)

at com.esotericsoftware.kryo.Kryo.newInstance(Kryo.java:1060)

at com.esotericsoftware.kryo.serializers.MapSerializer.create(MapSerializer.java:93)

at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:97)

at com.esotericsoftware.kryo.serializers.MapSerializer.read(MapSerializer.java:17)

at com.esotericsoftware.kryo.Kryo.readObject(Kryo.java:629)

at com.apn.transformer.kryo.KryoSerializerUtil.read(KryoSerializerUtil.java:57)

at com.apn.transformer.TrafficConfigTransformer.transform(TrafficConfigTransformer.java:48)

at com.apn.transformer.TrafficConfigTransformer.main(TrafficConfigTransformer.java:64)

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 com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Not sure might be the issue.

No idea. The unit tests pass. :)

-Nate