How to register private inner classe

[Mokarrom Hossain]

I am getting following error when registering in Kryo.

Caused by: java.lang.IllegalArgumentException: Class is not registered: shared.SharedObjectFactory$Segment[]
Note: To register this class use: kryo.register(shared.SharedObjectFactory$Segment[].class);
    at com.esotericsoftware.kryo.Kryo.getRegistration(Kryo.java:484)
    at com.esotericsoftware.kryo.Kryo.getSerializer(Kryo.java:502)
    at com.esotericsoftware.kryo.serializers.ObjectField.write(ObjectField.java:83)
    ... 22 moreEnter code here...

SharedObjectFactory class comes from a third party library. I don't have access it. How could I register private class Segment? I have looked similar another post, but I'm not understanding.

public class SharedObjectFactory{
    private final static int DEFAULT_NR_OF_SEGMENTS_BITSIZE = 5;
   
    private final Segment[] segments = new Segment[1];

            //...........

    private final static class Segment{
             //..........
             //...........
    }
}

[mongonix]

How about using:

 Class clazz = Class.forName("shared.SharedObjectFactory$Segment")

to obtain the class and then using 

 kryo.register(clazz) 

to register it?

You may also find this link useful, when it comes to registering an array:

http://stackoverflow.com/questions/4901128/obtaining-the-array-class-of-a-component-type

-Leo

[Mokarrom Hossain]

Thank you Leo!

But it's not working. I have also look you link, but unable to get any idea.

[mongonix]

On Thursday, June 4, 2015 at 11:05:41 AM UTC-7, Mokarrom Hossain wrote:

Thank you Leo!

But it's not working. I have also look you link, but unable to get any idea.

I think my suggestion should work. 

Could you post (a simplified version of) your code here? I need something reproducible and self-contained. A JUnit-test reproducing the problem would be ideal.

-Leo

[Mokarrom Hossain]

Reproducing should be easy. Write the class as I explained above. Now register and then serialize & deserialize the obj. FYI, I have set registrationRequired as true.

Class comes from third-party library looks like as follows

package firstmpjtest;

public class SharedObjectFactory {
   
    private final static int DEFAULT_NR_OF_SEGMENTS_BITSIZE = 5;
       
    private final Segment[] segments = new Segment[1];

            //...........

    private final static class Segment{
             //..........
             //...........
    }

}

My main file

        SharedObjectFactory sObj = new SharedObjectFactory();
        KryoSerializer.register(SharedObjectFactory.class);
        Class clazz = Class.forName("firstmpjtest.SharedObjectFactory$Segment");
        KryoSerializer.register(clazz);
       
        byte sByteArray[] = KryoSerializer.write(sObj);
        SharedObjectFactory a = (SharedObjectFactory) KryoSerializer.read(sByteArray);

Kryo wrapper...

public final class KryoSerializer {

   private static final Kryo kryo = new Kryo();

   static {
      kryo.setRegistrationRequired(true);
   }
   
   public static void register(Class... classes) {
      for(Class clazz : classes) {
         kryo.register(clazz);
      }
   }

   public static byte[] write(Object obj) {
       ByteArrayOutputStream bos = new ByteArrayOutputStream();
       Output o = new Output(bos);
       kryo.writeClassAndObject(o, obj);
       return o.toBytes();
   }
   
   public static Object read(byte[] bytes) {
       Input in = new Input(bytes);
       return kryo.readClassAndObject(in);
   }
}

[mongonix]

Please have a look at this JUnit-Test, I've written, which follows the recommendations from my previous message:

https://gist.github.com/romix/44f46ba4e82e3d72ad79

Does it do we you need?

-Leo

[Mokarrom Hossain]

Yes!
Now it's working. You are right.
This is the key that I was missing earlier.

                kryo.register(Array.newInstance(Class.forName("com.esotericsoftware.kryo.PrivateInnerClassTest$ConcreteClass$Segment"), 0)
                        .getClass());

Thank you so much Leo for your swift support!

[mongonix]

On Friday, June 5, 2015 at 8:23:20 AM UTC-7, Mokarrom Hossain wrote:

Yes!
Now it's working. You are right.
This is the key that I was missing earlier.

                kryo.register(Array.newInstance(Class.forName("com.esotericsoftware.kryo.PrivateInnerClassTest$ConcreteClass$Segment"), 0)
                        .getClass());

Thank you so much Leo for your swift support!

You are welcome! I'm glad that my suggestion helped you to solve your problem.

[Robert Benjamen Beatty]

Just a thanks for helping me solve a similar problem.

+1