Java CORBA中的BAD_PARAM [英] BAD_PARAM in java CORBA

问题描述

当我用Java编写客户端-服务器聊天程序时遇到BAD_PARAM错误.第一个代码段是服务器

I'm encountering the BAD_PARAM error when I program the Client-Server Chat program in Java. The first code segment is the Server

//Server.java

try {

        ORB orb = ORB.init(args, null);
        POA poa = POAHelper.narrow(orb
                .resolve_initial_references("RootPOA"));
        poa.the_POAManager().activate();

        ServerImpl s = new ServerImpl(port);
        System.out.println(port);
        org.omg.CORBA.Object obj = poa.servant_to_reference(s);
        Server r = ServerHelper.narrow(obj);

        // get reference to root naming context
        org.omg.CORBA.Object ns = orb
                .resolve_initial_references("NameService");
        NamingContextExt nc = NamingContextExtHelper.narrow(ns);

        // bind the Object Reference in Naming
        String name = "Chat";
        NameComponent path[] = nc.to_name(name);
        nc.rebind(path, r);


        System.out.println("Waiting for clients ... ");
        orb.run();

    } catch (Exception e) {
        e.printStackTrace();
    }

这是我的客户端

//Client.java
try {
        ORB orb = ORB.init(args, null);

        // get reference to root naming context
        org.omg.CORBA.Object ns = orb
                .resolve_initial_references("NameService");
        NamingContextExt nc = NamingContextExtHelper.narrow(ns);

        // lookup name
        String name = "Chat";
        org.omg.CORBA.Object obj = nc.resolve_str(name);
        Client c = ClientHelper.narrow(obj);

    } catch (Exception e) {
        //System.err.println(e.getMessage());
        e.printStackTrace();
    }

我已经启动了orbd和Server.java.除了客户，一切都很好.错误是org.omg.BAD_PARAM vmcid 0x0次要代码:0已完成:否，它发生在Client c = ClientHelper.narrow(obj);行上.

I started my orbd and the Server.java already. Everything is good except for the Client. The error is org.omg.BAD_PARAM vmcid 0x0 minor code: 0 completed: No and it happens at the line Client c = ClientHelper.narrow(obj);

我已经为这个错误苦苦挣扎了3天.有什么建议可以解决吗?谢谢，我非常感谢您的帮助！

I've been struggling with this bug for 3 days. Any suggestions to fix it? Thank you, I really appreciate your helps!

推荐答案

问题是您正在将Server对象绑定到服务器代码中的名称服务中，但是随后您的客户端代码尝试将其范围缩小到Client类型.这些类型不兼容.

The problem is that you are binding a Server object into the Name Service within your server code, but then your client code tries to narrow that to a Client type. Those types are incompatible.

更改您的客户端代码以代替执行此操作:

Change your client code to do this instead:

Server s = ServerHelper.narrow(obj);

对于客户端和服务器，您不需要两个单独的IDL接口.只需创建一个由服务器实现的文件，然后让客户端调用它即可.

You don't need two separate IDL interfaces for client and server. Just create one that the server implements, and have the client call it.

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