Why core objects like JsonArray, Buffer, JsonObject are not Serializable?

[Oren Shvalb]

Hello,

The mentioned classes are wrappers on a java.util containers which are Serializable. 

so, why not to expose this interface for the wrappers as well?

For example:

io.vertx.core.json.JsonObject    wraps     java.util.ArrayList   which implements Serializable.

same goes to Buffer and JsonObject.

The thing is that, if I would like to store JsonArray in Hazelcast map I can't because it's not implementing Serializable!

Is this something that can be fixed for the future?

If not, is there a workaround I can do to still be able to store it in HZ ?

Thank you!

[Tim Fox]

If you convert them to strings you can serialize them in Hazelcast

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[Oren Shvalb]

Yes, but then when I take it out from HZ map I wouldn't be able to convert them back to the class.

Why these classes don't implement Serialzable? Is there a reason for that?

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[Tim Fox]

On 16/05/16 12:15, Oren Shvalb wrote:

Yes, but then when I take it out from HZ map I wouldn't be able to convert them back to the class.

Sure you can:

JsonObject obj = new JsonObject(stringIGotFromHazelcast);

Internally in Vert.x (e.g. if you add a JsonObject to a clustered map) we serialize Json objects as strings.

(See the ClusterSerializable interface)

Why these classes don't implement Serialzable? Is there a reason for that?

Java serialization is very inefficient. It's much more efficient to let Jackson serialize to a string, and then use that as the serialized form.

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[Oren Shvalb]

By saying "i wouldn't be able to convert..." 

My case is a bit more complicated than storing JsonObject directly to map. I store custom classes which JsonObject is just another field in the class. Hence my problem.

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[Jochen Bedersdorfer]

You could have your custom class implement https://docs.oracle.com/javase/7/docs/api/java/io/Externalizable.html and then do the string conversion in readExternal/writeExternal.

[Oren Shvalb]

Thank you for this idea! - I will look into it.

:-)

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[Tim Fox]

If you want to store in a HZ map _directly_ then DataSerializable should be implemented:

http://docs.hazelcast.org/docs/3.5/manual/html/dataserialization.html

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[Oren Shvalb]

Thank you for this comment - I will look into this interface - it looks like the right solution!

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