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PODeserializing arbitrary object json arrays in inner classes with Gson or nested inner class
 

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    <p>I am having troubles when I try to deserialize one Json string with Gson. The string goes something like this (Note: I just simplified it, but leaving the part I am having troubles with and because of that, there might be Json syntaxis errors, but I have checked with an online validator that the string I am working with is OK):</p> <pre><code>// let's call this "container" json element { "context": "context", "cpuUsage": cpuUsageValue, "name": "thename", "rates": { "definition": [ { "key": "name", "type": "string" }, { "key": "rate", "type": "double" } ] "rows": [ { "name": "thename1", "rate": therate }, { "name": "thename2", "rate": therate2 } ] } </code></pre> <p>Now, the problem I get is when I try to deserialize the json arrays ("definition" and "rows"). Rest of fields get proper values in deserialization. The class definition I am using is the following (no getters/setters for simplicity):</p> <pre><code>public class Container { private String context; private Double cpuUsage; private String name; private RateContainer rates; public Container() { } } </code></pre> <p>RateContainer (inner static class to class Container, according to Gson specs):</p> <pre><code>public static class RateContainer { private List&lt;DefinitionContainer&gt; definition; private List&lt;RowsContainer&gt; rows; public static class DefinitionContainer { String key; String type; public DefinitionContainer() { } } public static class RowsContainer { String name; Double rate; public RowsContainer() { } } public RateContainer() { } } </code></pre> <p>To parse the Json string, I use:</p> <pre><code>Container container = gson.fromJson(containerString, Container.class); </code></pre> <p>and I get the following exception:</p> <pre><code>Expecting object found: [{"key":"name","type":"string"},{"key":"rate","type":"double"}] </code></pre> <p>Looks like there has to be something in the class definition that does not work well. I have checked the Gson API and I know that, in order to deserialize lists, the usual thing to do is: </p> <pre><code>Type collectionType = new TypeToken&lt;Collection&lt;Integer&gt;&gt;(){}.getType(); Collection&lt;Integer&gt; ints2 = gson.fromJson(json, collectionType); </code></pre> <p>so I thought that maybe I could get these arrays first, using something like:</p> <pre><code>JsonElement element = containerJsonElement.getAsJsonObject().get("rates"); </code></pre> <p>and then get "definition" and "rows", but I would prefer to keep everything in the Container object. Is there a way to deserialize these lists in such a way? Is there something wrong in the class definition? </p> <p>Thank you all in advance!</p>
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