我正在使用jsonrpc4j并卡住了。我做了一个小例子来说明我的问题:
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,日志将打印:
JSON-PRC Request: {"id":"6064348714687420633","jsonrpc":"2.0","method":"getNut"}
JSON-PRC Response: {"jsonrpc":"2.0","id":"6064348714687420633",
"result":{"@type":"Walnut"}}
如果我调用remoteService.setNut(new Walnut())服务器抛出异常,日志打印:
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(请参阅我的最后一个问题以了解为什么在这种情况下缺少信息类型)。
我怎样才能实现所需的序列化?我尝试启用默认类型并通过混合注释(使用@JsonTypeInfo)Object.class,但都失败了(以下例外)。
启用默认类型 [ remoteService.getNut(),服务器端错误]:
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
启用默认类型 [ remoteService.setNut(new Walnut()),客户端出错]:
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)
使用混入 [ remoteService.getNut(),服务器端出错]:
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]
使用混入 [ remoteService.setNut(new Walnut()),客户端出错]:
Exception in thread "main" java.lang.ClassCastException:
[Ljava.lang.Object; cannot be cast to
com.fasterxml.jackson.databind.JsonNode
有任何想法吗?