A better JSON API for collection of java 1.4 objects

I am using JSON-simple API to convert java object array to JSON string without any success.

The response is weird: [object-name@6ddc07] and I get error on AJAX call.

Is there a better API compatible with JDK 1.4.

Thanks a 开发者_JAVA技巧lot!

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How about the official JSON library?