java.rmi.AccessException:不允许使用Registry.rebind；origin/10.0.0.71是非本地主机

我有一个使用RMI的简单客户机/服务器计算器应用程序。服务器和客户端位于不同的linux机器中。客户端ip为10.0.0.71，服务器ip为10.0.1.100

这是远程接口：

package com.simplecalc.commons;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Calculator extends Remote {
    public float add(float a, float b) throws RemoteException;
}

package com.simplecalc.server;

import java.rmi.RemoteException;
import com.simplecalc.commons.Calculator;

public class CalculatorImpl implements Calculator {
    @Override
    public float add(float a, float b) throws RemoteException {
        float result = a + b;
        System.out.println("$ (" + a + " + " + b + ") = " + result);
        return result;
    }
}

这是实现远程接口的服务器端代码：

package com.simplecalc.commons;

import java.rmi.Remote;
import java.rmi.RemoteException;

public interface Calculator extends Remote {
    public float add(float a, float b) throws RemoteException;
}

package com.simplecalc.server;

import java.rmi.RemoteException;
import com.simplecalc.commons.Calculator;

public class CalculatorImpl implements Calculator {
    @Override
    public float add(float a, float b) throws RemoteException {
        float result = a + b;
        System.out.println("$ (" + a + " + " + b + ") = " + result);
        return result;
    }
}

这是运行应用程序的服务器端代码：

package com.simplecalc.server;

import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

import com.simplecalc.commons.Calculator;

public class Server {

    private static void setPolicy() {
        System.setProperty("java.security.policy", "file:///calculator.policy");
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new SecurityManager());
        }
    }

    public static void main(String[] args) throws RemoteException {
        setPolicy();
        int port = 1099;
        Calculator engine = new CalculatorImpl();
        Calculator stub = (Calculator) UnicastRemoteObject.exportObject(engine, 0);
        Registry registry = LocateRegistry.getRegistry(port);
        System.out.println("Registering calculator object ...");
        registry.rebind(Calculator.class.getSimpleName(), stub);
    }
}

最后，这是调用计算器的客户端：

package com.simplecalc.client;

import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

import com.simplecalc.commons.Calculator;

public class CalculatorClient {

    private static void setPolicy() {
        System.setProperty("java.security.policy", "file:///calculator.policy");
        if (System.getSecurityManager() == null) {
            System.setSecurityManager(new SecurityManager());
        }
    }

    public static void main(String[] args) throws RemoteException, NotBoundException {
        setPolicy();
        int port = 1099;
        String server="10.0.1.100";

        Registry registry = LocateRegistry.getRegistry(server, port);
        Calculator calculator = (Calculator) registry.lookup(Calculator.class.getSimpleName());
        registry.rebind(server, calculator);
        float result = calculator.add(10F, 5F);
        System.out.println("Result: " + result);
    }
}

这是

计算器.policy

文件：

grant {
    permission java.security.AllPermission;
    permission java.net.SocketPermission "localhost:1099", "connect, resolve";
    permission java.net.SocketPermission "127.0.0.1:1099", "connect, resolve";
    permission java.net.SocketPermission "10.0.0.71:1099", "connect, resolve";
    permission java.net.SocketPermission "localhost:80", "connect, resolve";
};

grant {
    permission java.security.AllPermission;
};

我编译了服务器代码并成功启动了RMI注册表，如下所示：

cd server_classes_directory
rmiregistry 1099 &

然后我成功地运行了类

com.simplecalc.server.server

当我运行类

com.simplecalc.client.CalculatorClient

时，我得到一个异常：

Exception in thread "main" java.rmi.ServerException: RemoteException occurred in server     thread; nested exception is: 
    java.rmi.AccessException: Registry.rebind disallowed; origin /10.0.0.71 is non-local host
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:389)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:835)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(    StreamRemoteCall.java:283)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:260)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:375)
    at sun.rmi.registry.RegistryImpl_Stub.rebind(RegistryImpl_Stub.java:155)
    at com.simplecalc.client.CalculatorClient.main(CalculatorClient.java:27)
Caused by: java.rmi.AccessException: Registry.rebind disallowed; origin /10.0.0.71 is     non-local host
    at sun.rmi.registry.RegistryImpl.checkAccess(RegistryImpl.java:350)
    at sun.rmi.registry.RegistryImpl_Skel.dispatch(RegistryImpl_Skel.java:128)
    at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:468)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:300)
    at sun.rmi.transport.Transport$1.run(Transport.java:200)
    at sun.rmi.transport.Transport$1.run(Transport.java:197)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:573)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:835)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:688)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:687)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

---

有什么想法吗？

正如错误所说，您不能绑定、重新绑定或取消绑定到远程注册表。您必须在同一台主机上运行。这是RMI的基本安全措施

---

但你的客户一开始不应该做绑定。这没有道理。它所要做的只是将刚刚查找到的服务器重新绑定到同一个注册表中。把它取下来。

我终于发现了问题

问题是，我用来注册和查找rmi服务的方法只有在客户机和服务器位于同一台机器上时才起作用

无需实例化

SecurityManager

远程接口实现必须扩展

UnicastRemoteObject

我完全打开java安全策略

这是新的远程接口实现：

package com.simplecalc.server;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;
import com.simplecalc.commons.Calculator;

public class CalculatorImpl extends UnicastRemoteObject implements Calculator {
    @Override
    public float add(float a, float b) throws RemoteException {
        float result = a + b;
        System.out.println("$ (" + a + " + " + b + ") = " + result);
        return result;
    }
}

这是新的服务器类：

package com.simplecalc.server;

import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;

import com.simplecalc.commons.Calculator;

public class Server {

    public static void main(String[] args) throws RemoteException {
        final int port = 1099;
        final String serverIp = "10.0.1.100";
        final String serviceName = Calculator.class.getSimpleName();
        final String url = "rmi://" + serverIp + ":" + port + "/" + serviceName;

        System.out.println("Registering calculator object ...");
        CalculatorImpl engine = new CalculatorImpl();
        Naming.rebind(url, engine);
        System.out.println("Server listening on " + url);
    }
}

这是新的客户端类：

package com.simplecalc.client;

import java.rmi.NotBoundException;
import java.rmi.RemoteException;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;

import com.simplecalc.commons.Calculator;

public class CalculatorClient {

public static void main(String[] args) throws RemoteException, NotBoundException {
        final int port = 1099;
        final String serverIp = "10.0.1.100";
        final String serviceName = Calculator.class.getSimpleName();
        final String url = "rmi://" + serverIp + ":" + port + "/" + serviceName;

        Calculator calculator = (Calculator) Naming.lookup(url);
        float result = calculator.add(10F, 5F);
        System.out.println("Result: " + result);
    }
}

calculator.policy

文件：

grant {
    permission java.security.AllPermission;
    permission java.net.SocketPermission "localhost:1099", "connect, resolve";
    permission java.net.SocketPermission "127.0.0.1:1099", "connect, resolve";
    permission java.net.SocketPermission "10.0.0.71:1099", "connect, resolve";
    permission java.net.SocketPermission "localhost:80", "connect, resolve";
};

grant {
    permission java.security.AllPermission;
};

---

最后你找到了吗？（1） 你已经被告知了，这是你在这里唯一需要做的事情。（2） 在这里是正确的，但并非所有情况下都是如此，也不是导致此问题的原因。（3） 不正确：您可以手动导出它，如下所述。（4） 与此完全无关，因为您现在没有安全管理器EJP 14分钟前在某些情况下，例如容器化，您实际上希望从远程注册表绑定。请不要假设StackOverflow上的每个问题都是XY问题。