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Convert multiple Java Beans to JSON

 
Greenhorn
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I have multiple Java bean classes that are associated to each other (JSON Array + JSON Object) since they have a nested structure. There are about 10 classes. I had created these classes out of a JSON data which I don't have access to right now. So, now, what I'm looking forward is to create a dummy JSON out of those classes. Using GSON, I tried converting one of these Bean classes however, I got an empty result. Here is one of the beans called Attachment.java.

Attachment.java



Implementation




 
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This section of the Gson User Guide: https://sites.google.com/site/gson/gson-user-guide#TOC-Finer-Points-with-Objects

The fourth bullet point explains how null fields are handled.
 
Consider Paul's rocket mass heater.
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