Support Throwable and Exception for serializing/deserializing

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https://groups.google.com/d/topic/google-gson/fGTi5EEc9jM/discussion

Original issue reported on code.google.com by in...@trymph.com on 6 Sep 2012 at 10:58

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just for clarity, here's a patch that implements this.

Original comment by sysbliss on 6 Sep 2012 at 11:50

Attachments:

• ReflectivePolymorphicThrowables.patch

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any progress on this?

Original comment by sysbliss on 25 Sep 2012 at 11:37

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Original comment by limpbizkit on 4 Feb 2013 at 4:07

• Added labels: Priority-High, Type-Enhancement
• Removed labels: Priority-Medium, Type-Defect

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dealing with Throwables still fails in gson-2.2.4. Is the patch ready to be 
used ?

Original comment by liviu.ca...@gmail.com on 13 Jul 2013 at 4:34

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I need that patch, too. I'm currently writing a client / server architecture 
and the exceptions should also be returned to the client.

Original comment by noctur...@googlemail.com on 14 Apr 2014 at 10:11

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We will not integrate that patch since it has a huge security hole. We can't 
trust the class information present in the JSON. We will have to think of an 
alternate way.

Original comment by inder123 on 17 Apr 2014 at 10:15

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It is ridiculous that GSON still does not support to serialize 
Throwable/Exception objects 2 years after it has been reported. This cannot be 
too hard to implement.

Anyway, thanks for your great work. But I would be much more thankful if you 
would solve this problem ;P

Original comment by simonspr...@gmail.com on 20 Aug 2014 at 6:38

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simonsprankel: I have had some false starts on this, but punted when realized 
that the specs aren't clear. Can you explain what your expectations are by 
serializing/deserializing an exception object? Please provide some examples as 
well.

Original comment by inder123 on 20 Aug 2014 at 6:42

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Thanks for your superfast reply! Just FYI, there is also a Stack Overflow 
thread on this topic: 
https://stackoverflow.com/questions/8151082/gson-an-java-throwable

In the Stack Overflow thread, there is also an example how Jackson serializes 
exceptions (though I am not sure if it is still up to date).

I personally would expect that the important fields are properly 
serialized/unserialized (so that the getter functions return the same data 
after the serialization process):
- cause
- detailMessage
- stacktrace
- suppressedExceptions

But in any case, serializing/deserializing something or just the real basic 
stuff would be better than an exception.

Original comment by simonspr...@gmail.com on 20 Aug 2014 at 6:53

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The big problem is the cause field. That is what causes the 
CircularReferenceException. I can't figure out a good way to solve it when it 
is not null. It requires the general solution for CircularReferenceException 
which we have punted on for too long. We used to support it in Gson 1.x....

Original comment by inder123 on 20 Aug 2014 at 7:25

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As already written, just skipping the cause field would be better than getting 
an exception. It is not too bad if it will be properly documented.
But another idea: Would it be possible to just break the recursion? If we want 
to serialize a Throwable "e", which has a Throwable "e2" in its cause field, 
can we just ignore the cause field of e2? This should solve the problem, right?

Original comment by simonspr...@gmail.com on 20 Aug 2014 at 7:32

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This issue was closed by revision r1308.

Original comment by inder123 on 16 Nov 2014 at 10:25

• Changed state: Fixed

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Thanks inder123!
Do you know when this is scheduled for release?

Original comment by ant...@gmail.com on 18 Nov 2014 at 11:13

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antweb: Hopefully, this week itself. Just waiting for some code reviews to 
complete.

Original comment by inder123 on 19 Nov 2014 at 7:16

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Thanks - please let me know when this has been released as my project is 
waiting :)

Original comment by ant...@gmail.com on 10 Dec 2014 at 2:53

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@antweb: This is already publicly available with Gson 2.3.1

Original comment by inder123 on 16 Dec 2014 at 7:19