Question

I have a custom object that I would like to save in the datastore(not the blobstore).
Something like

Entity.setProperty("myobj", custonObject)

I have a list of users within this customObject

public user class{
 String name;
 String age;
}

public user_s class{

 List<user> userList;

 public user_s(){
  userList = new ArrayList<user>();
 }
}

I would then like to save user_s.

I guess I need some serialization, if at all possible. I can see that there is a Blob class in the datastore, but how do you use it?
https://developers.google.com/appengine/docs/java/datastore/entities

Regards

Answer 1

Yes, there is a Blob class.

Serialization is simple:

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ObjectOutputStream oos = new ObjectOutputStream(baos);
    oos.writeObject(obj);
    Blob blob = new Blob(baos.toByteArray());