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copied!<p>JSON-lib initially parses and populates a Java Map with the input JSON. Unfortunately, JSON-lib then checks whether every JSON object element name is a JSON <code>null</code>. It's <code>null</code> check is performed in the <code>JSONNull.equals(Object)</code> method. This method returns true for a "null" JSON string, which of course is not actually a JSON <code>null</code> value.</p> <p>I recommend filing a bug with the JSON-lib project for this issue. The implementation of <code>JSONNull.equals(Object)</code> is flawed.</p> <p>Unfortunately, it's not possible to handle this with a custom <code>PropertyNameProcessor</code>.</p> <p>Options available for a more immediate solution include altering the JSON-lib code yourself, or switching libraries.</p> <p>If you can switch libraries, I highly recommend <a href="http://jackson.codehaus.org" rel="nofollow">Jackson</a>. Following is an example of using it to deserialize the example JSON in the original question.</p> <pre><code>/* { "properties" : { "null" : { "value" : false } } } */ String json = "{\"properties\":{\"null\":{\"value\":false}}}"; ObjectMapper mapper = new ObjectMapper(); Map<String, Object> map = mapper.readValue(json, Map.class); System.out.println(map); // output: {properties={null={value=false}}} Map<String, Object> propertiesMap = (Map) map.get("properties"); System.out.println(propertiesMap); // output: {null={value=false}} Map<String, Object> nullMap = (Map) propertiesMap.get("null"); System.out.println(nullMap); // output: {value=false} </code></pre>

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