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POjsonrpc4j: How to add type info to parameters?
 

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  1. POjsonrpc4j: How to add type info to parameters?
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    <p>I am using <a href="http://code.google.com/p/jsonrpc4j/" rel="nofollow noreferrer">jsonrpc4j</a> and got stuck. I made a little example to show my problem:</p> <p>Abstract class:</p> <pre><code>@JsonTypeInfo(use = JsonTypeInfo.Id.NAME) @JsonSubTypes(value = { @JsonSubTypes.Type(value = Walnut.class) }) public abstract class Nut { } </code></pre> <p>Concrete subclass:</p> <pre><code>public class Walnut extends Nut { } </code></pre> <p>Interface for the service:</p> <pre><code>public interface ServiceInterface { public Nut getNut(); public void setNut(Nut nut); } </code></pre> <p>The service itself:</p> <pre><code>public class Service implements ServiceInterface { public Nut getNut() { return new Walnut(); } public void setNut(Nut nut) {} } </code></pre> <p>Server:</p> <pre><code>JsonRpcServer rpcServer = new JsonRpcServer(new ObjectMapper(), new Service()); StreamServer streamServer = new StreamServer(rpcServer, 50, 1420, 50, InetAddress.getByName("127.0.0.1")); streamServer.start(); </code></pre> <p>Client:</p> <pre><code>JsonRpcClient jsonRpcClient = new JsonRpcClient(new ObjectMapper()); ServiceInterface remoteService = ProxyUtil.createClientProxy( ServiceInterface.class.getClassLoader(), ServiceInterface.class, jsonRpcClient, new Socket(InetAddress.getByName("127.0.0.1"), 1420)); </code></pre> <p>If i call <em>remoteService.getNut()</em> everything works as expected, the log prints:</p> <pre><code>JSON-PRC Request: {"id":"6064348714687420633","jsonrpc":"2.0","method":"getNut"} JSON-PRC Response: {"jsonrpc":"2.0","id":"6064348714687420633", "result":{"@type":"Walnut"}} </code></pre> <p>If i call <em>remoteService.setNut(new Walnut())</em> the server throws an exception, the log prints:</p> <pre><code>JSON-PRC Request {"id":"9194853851254039397","jsonrpc":"2.0", "method":"setNut","params":[{}]} Error in JSON-RPC Service com.fasterxml.jackson.databind.JsonMappingException: Unexpected token (END_OBJECT), expected FIELD_NAME: missing property '@type' that is to contain type id (for class Nut) </code></pre> <p>The type information of the parameter is missing because the proxy wraps all parameters into one object array (see my last <a href="https://stackoverflow.com/q/14582343/2021412">question</a> to understand why the info type is missing in this case).</p> <p>How can i achieve the desired serialization? I tried to enable default typing and to annotate (with @JsonTypeInfo) the <em>Object.class</em> via mix-in, but both failed (exceptions below).</p> <p>With enabled default typing [<em>remoteService.getNut()</em>, error on server side]:</p> <pre><code>Exception while handling request com.fasterxml.jackson.databind.JsonMappingException: Unexpected token (START_OBJECT), expected START_ARRAY: need JSON Array to contain As.WRAPPER_ARRAY type information for class com.fasterxml.jackson.databind.JsonNode </code></pre> <p>With enabled default typing [<em>remoteService.setNut(new Walnut())</em>, error on client side]:</p> <pre><code>Exception in thread "main" java.lang.IllegalArgumentException: Unexpected token (START_ARRAY), expected VALUE_STRING: need JSON String that contains type id (for subtype of com.fasterxml.jackson.databind.JsonNode) </code></pre> <p>With mix-in [<em>remoteService.getNut()</em>, error on server side]:</p> <pre><code>Exception while handling request java.lang.IllegalArgumentException: Could not resolve type id 'DefaultErrorResolver$ErrorData' into a subtype of [simple type, class com.fasterxml.jackson.databind.JsonNode] </code></pre> <p>With mix-in [<em>remoteService.setNut(new Walnut())</em>, error on client side]:</p> <pre><code>Exception in thread "main" java.lang.ClassCastException: [Ljava.lang.Object; cannot be cast to com.fasterxml.jackson.databind.JsonNode </code></pre> <p>Any ideas?</p>
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    1. COIt would be better if you post ONLY the relevant portion of code, it's too lengthy to read..!
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    2. COThis is a minimum working example and I can not think of one line to omit in this case - if you could point out any irrelevant portions i am maybe able to improve my question.
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