jsonrpc4j：如何向参数添加类型信息？

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问题描述

我正在使用并被卡住了。我举了一个例子来说明我的问题：

I am using jsonrpc4j and got stuck. I made a little example to show my problem:

抽象类：

@JsonTypeInfo(use = JsonTypeInfo.Id.NAME)
@JsonSubTypes(value = { @JsonSubTypes.Type(value = Walnut.class) })
public abstract class Nut {

}

具体子类：

public class Walnut extends Nut {

}

服务接口：

public interface ServiceInterface {
    public Nut getNut();
    public void setNut(Nut nut);
}

服务本身：

public class Service implements ServiceInterface {
    public Nut getNut() { return new Walnut(); }
    public void setNut(Nut nut) {}
}

服务器：

JsonRpcServer rpcServer = new JsonRpcServer(new ObjectMapper(), new Service());
StreamServer streamServer = new StreamServer(rpcServer, 50, 1420,
        50, InetAddress.getByName("127.0.0.1"));
streamServer.start();

客户：

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));

如果我调用 remoteService.getNut（），一切都按预期工作，日志打印：

If i call remoteService.getNut() everything works as expected, the log prints:

JSON-PRC Request: {"id":"6064348714687420633","jsonrpc":"2.0","method":"getNut"}
JSON-PRC Response: {"jsonrpc":"2.0","id":"6064348714687420633",
        "result":{"@type":"Walnut"}}

如果我打电话给 remoteService.setNut（new Walnut（））服务器抛出异常，日志打印：

If i call remoteService.setNut(new Walnut()) the server throws an exception, the log prints:

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)

缺少参数的类型信息，因为代理将所有参数包装到一个对象数组中（参见我的l请以了解在这种情况下缺少信息类型的原因。）

The type information of the parameter is missing because the proxy wraps all parameters into one object array (see my last question to understand why the info type is missing in this case).

如何实现所需的序列化？我尝试启用默认输入并通过混合注释（使用@JsonTypeInfo） Object.class ，但都失败了（以下例外）。

How can i achieve the desired serialization? I tried to enable default typing and to annotate (with @JsonTypeInfo) the Object.class via mix-in, but both failed (exceptions below).

启用默认输入[ remoteService.getNut（），服务器端错误]：

With enabled default typing [remoteService.getNut(), error on server side]:

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

启用默认输入[ remoteService。 setNut（new Walnut（）），客户端错误]：

With enabled default typing [remoteService.setNut(new Walnut()), error on client side]:

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)

使用混合[ remoteService.getNut（），服务器端出错]：

With mix-in [remoteService.getNut(), error on server side]:

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]

使用混合[ remoteService.setNut（new Walnut（）），客户端出错]：

With mix-in [remoteService.setNut(new Walnut()), error on client side]:

Exception in thread "main" java.lang.ClassCastException:
        [Ljava.lang.Object; cannot be cast to
        com.fasterxml.jackson.databind.JsonNode

任何想法？

remoteService

jsonrpc4j：如何向参数添加类型信息？

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