Very strange problem with enum serialization

[fra86co]

I've this class hierarchy

//file Type.java

public enum Type{

 TypeA,TypeB;

}

//File Message.java

public abstract class Message {

  private Type type;

 //getter and setter methods

}

//File MessageImpl.java

public class MessageImpl extends Message {

  private int x;

 //getter and setter methods

}

Now if i try to serialize and deserialize (with ObjectOutputStream and ObjectInputStream open on a socket) a MessageImpl object, i will obtain a MessageImpl instance

with the same 'x' value but with a null value for type field also if i've specified one.

The strange thing is that if i use this class:

//File MessageImpl2.java

public class MessageImpl2.java{

  private Type type;

  private int x;

 //getter and setter methods

}

the serialization of a MessageImpl2 object works well.

Do you kwow how class hierarchy can affect enum serialization???

Thanks

[LeleFT]

You must implement Serializable interface in the Message class if you want to serialize such type of objects.

public abstract class Message implements Serializable {
   ...
}

So, you ensure all your sub-classes to be serializable.


PS: Use the CODE tag when you post code snipplets.

[lolide]

Originariamente inviato da fra86co
//File Message.java

public abstract class Message {

private Type type;

//getter and setter methods

}

//File MessageImpl.java

public class MessageImpl extends Message {

private int x;

//getter and setter methods

}

Hi...

Are you sure Message class is correctly inherited by MessageImpl?
You should declare type as public or protected to make it inheritable.