Serialize objects containing objects java

Question

I try to serialize an object that contains an other object which is itself serializable.

Is there a way to make it work ? The pointer to the other object seems to be lost when I serialize the first object.

Yes, it should work if both objects implement Serializable. Some code, please! — Carl Smotricz
– Carl Smotricz, Commented Jan 5, 2010 at 15:49

JuanZe · Accepted Answer · 2015-03-17 14:43:45Z

7

Here are two rules concerning persistent objects:

Rule #1: The object to be persisted must implement the Serializable interface or inherit that implementation from its object hierarchy
Rule #2: The object to be persisted must mark all nonserializable fields transient

Check the article "Discover the secrets of the Java Serialization API". It's include source code and a good explanation of the serialization process.

Source code answering "How do I serialize a tree of objects?" is also available at http://docs.oracle.com/javase/8/docs/technotes/guides/rmi/faq.html#tree

To know some "under the hood" details check this excellent article: The Java serialization algorithm revealed.

edited Mar 17, 2015 at 14:43

answered Jan 5, 2010 at 15:58

JuanZe

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1 Comment

abksrv Over a year ago

The links provided are no more available. :(

Bozho · Accepted Answer · 2010-01-05 15:50:38Z

2

The "pointer" is lost indeed. After deserialization new objects are constructed.

Before you provide your code - check whether your 2nd object isn't defined as transient - this stops java serialization.

answered Jan 5, 2010 at 15:50

Bozho

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Kaleb Brasee · Accepted Answer · 2010-01-05 15:51:09Z

2

All of the attributes of the Serializable object should be serialized as well, unless they're defined as transient.

answered Jan 5, 2010 at 15:51

Kaleb Brasee

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Jon Skeet · Accepted Answer · 2010-01-05 15:50:28Z

1

It should work just fine, so long as everything's serializable. What do you mean by the pointer (by which I assume you mean reference) being "lost"?

Could you provide a short but complete program which demonstrates the problem? Admittedly Java binary serialization can be fiddly at times, but this much should work fine out of the box.

answered Jan 5, 2010 at 15:50

Jon Skeet

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cgp · Accepted Answer · 2010-01-05 15:51:12Z

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You might be happy using SOJO. It serializes the entire hierarchy of a Java object pretty easily.

answered Jan 5, 2010 at 15:51

cgp

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Punith Raj · Accepted Answer · 2012-04-27 18:22:46Z

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I exactly feel the same, the inner object value will be also serializable until and unless it is being marked transient. If the inner object class was not serializable then it would throw a compile time error.

Kindly let us know if u did solve it and if my understanding is wrong.

answered Apr 27, 2012 at 18:22

Punith Raj

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Gadi · Accepted Answer · 2014-12-05 10:56:47Z

0

https://github.com/gadieichhorn/prototype-jpa

I created this github project that includes some serialisation into a @Lob please check it out and let me know if you have any comments.

maven
jpa - eclipse link - derby
slf4j - logback
junit - hamcrest

feedback is welcomed.

answered Dec 5, 2014 at 10:56

Gadi

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