Object Serialization in hibernate

ajse · **Joined:** Fri Apr 01, 2005 2:15 am **Posts:** 14

Hi all,

I am having some problem in understanding serialization.When we serialize an object we first implement Serializable interface and then write the object into a stream(file).
But when we make an object Serializable in hibernate we do not write it manually in stream.We just implement Serializable interface and nothing else.I want to know ,does hibernate writes this object into stream internally or anything else.Please let me know.

with regards,
ajse

steckemetz · **Posted:** Thu Dec 15, 2005 4:20 am

I dont if I understand you right.
Are you talking about output to the database ?
This is done by hibernate using PreparedStatements,
each java attribute is set to a preparedStatement
when writing. When reading jdbc result sets are
used.

ajse · **Joined:** Fri Apr 01, 2005 2:15 am **Posts:** 14

I want to know why we make our classes(corresponding to a table) serializable in hibernate?

jmoring · **Joined:** Thu Dec 15, 2005 8:31 am **Posts:** 10

They do not have to be Serializable for use with Hibernate. But if you want to return these objects to a remote client they will have to be.

ajse · **Joined:** Fri Apr 01, 2005 2:15 am **Posts:** 14

How this thing works?Hibernate write these objects into streams or jvm does this?

steckemetz · **Posted:** Fri Dec 16, 2005 3:50 am

The JVM or you application server is doing this for you usually.
You can easily call it yourself using:

To stream:

Code:

ByteArrayOutputStream o = new ByteArrayOutputStream();
ObjectOutput output =
   new ObjectOutputStream(new BufferedOutputStream(os));
output.writeObject(obj);
output.close();

from stream:

Code:

InputStream is = new ByteArrayInputStream(os.toByteArray());
ObjectInputStream input =
   new ObjectInputStream(new BufferedInputStream(is));
Object copy= input.readObject();

ajse · **Joined:** Fri Apr 01, 2005 2:15 am **Posts:** 14

Thanks for the reply