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    <p>With GSON, assuming that the class you are deserializing into has fields for all the names that appear in the JSON, the fields not found in the JSON will just be left null:</p> <p><a href="https://sites.google.com/site/gson/gson-user-guide#TOC-Finer-Points-with-Objects" rel="nofollow">https://sites.google.com/site/gson/gson-user-guide#TOC-Finer-Points-with-Objects</a></p> <p>"While deserialization, a missing entry in JSON results in setting the corresponding field in the object to null"</p> <p>Things get a little more complicated if arbitrary field names are allowed in the JSON - for example, if Point allows c1, c2, ... cn. But you can handle this with a custom deserializer.</p> <p><a href="https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer" rel="nofollow">https://sites.google.com/site/gson/gson-user-guide#TOC-Writing-a-Deserializer</a></p> <p><strong>Edit:</strong></p> <p>Here's how you might write a custom deserializer for Point:</p> <pre><code>private class DateTimeDeserializer implements JsonDeserializer&lt;Point&gt; { public Point deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException { List&lt;PointPart&gt; parts = Lists.newArrayList(); for(Map.Entry&lt;String,JsonElement&gt; entry : json.getAsJsonObject().entrySet()) { char type = ; int index = Integer.parseInt(entry.getKey().substring(1)) - 1; while(parts.size() &lt;= index) { parts.add(new PointPart()); } PointPart part = parts.get(index); switch(entry.getKey().charAt(0)) { case 'c': part.c = entry.getValue().getAsBoolean(); break; case 'k': part.k = entry.getValue().getAsInt(); break; } } return new Point(parts); } } class Point { List&lt;PointPart&gt; parts; Point(List&lt;PointPart&gt; parts) { this.parts = parts; } } class PointPart { boolean c; int k; } </code></pre>
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    1. COThanks. If a field exists in the json but not in the class, what happens?
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    2. COI believe it normally throws a parse exception. You could make it ignore those fields by creating an `ExclusionStrategy` that excludes any field that does not appear in the target class. (But a custom deserializer is a better option)
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    3. COI am hoping to avoid writing a custom deserializer, since I'm catching this fairly early in the development cycle. I am going to scratch my head some more on this. Thanks for the advice.
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