Is there a JSON library that can serialize Proxy objects?

Question

Using ActiveObjects as my ORM and Gson as my JSON processor.

Ran into a problem going toJson from persisted objects. The problem is that my persisted class is actually an Interface and AO is proxying that object under the hood. Here's some sample code:

    Venue venue = manager.get(Venue.class, id);
    gson.toJson(venue);

Comes up with this exception:

java.lang.UnsupportedOperationException: Expecting parameterized type,
got interface java.lang.reflect.InvocationHandler.
 Are you missing the use of TypeToken idiom?
 See http://sites.google.com/site/gson/gson-user-guide#TOC-Serializing-and...

Because venue.getClass().getName() gives:

$Proxy228

I've tried a few solutions in various combinations:

    gsonBuilder.registerTypeAdapter(Venue.class, newVenueSerializer());
    Type listType = new TypeToken<Venue>() {}.getType();

Nothing has worked so far and I'm using a wonky field-by-field workaround. Any suggestions? I'm not married to Gson, so if there's an alternative library that can do this I'd be happy to use it.

score 0 · Accepted Answer · answered Apr 28 '10 at 22:15

0

Flex JSON should work - it will use the bean property introspector to pull the object, and I assume the proxy class implements those properly.

answered Apr 28 '10 at 22:15

stevedbrown

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Will give it a shot and report back. Thanks! – gmoore Apr 28 '10 at 23:10
Doesn't look like the proxy class is implementing any introspectors. If it did, though, you'de have been right. So, you win. – gmoore May 03 '10 at 19:13

score 0 · Answer 2 · answered Apr 30 '10 at 18:27

0

Also check out the Jackson.

answered Apr 30 '10 at 18:27

Joao Coelho

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Is there a JSON library that can serialize Proxy objects?

2 Answers2