I am trying to serialize a List of List of some objects (of a customized class: List> ), using Kryo.
list2D; // List<List<MyClass>> which is already produced.
Kryo k1 = new Kryo();
Output output = new Output(new FileOutputStream("filename.ser"));
k1.writeObject(output, (List<List<Myclass>>) list2D);
output.close();
So far no problem, it writes out the list with no errors. But when I try to read it:
Kryo k2 = new Kryo();
Input listRead = new Input(new FileInputStream("filename.ser"));
List<List<Myclass>> my2DList = (List<List<Myclass>>) k2.readObject(listRead, List.class);
I get this error:
Exception in thread "main" com.esotericsoftware.kryo.KryoException: Class cannot be created (missing no-arg constructor): java.util.List
How can I solve this problem?
You can't use List.class
when read objects back, since List
is an interface.
k2.readObject(listRead, ArrayList.class);