TechQA.

RMI Registry permission denied

1.8k views Asked by At

I am trying to get started with java RMI but I keep running in to an error when my components try to bind (or even connect) to the rmiregistry. Whenever I try to bind anything to the rmiregisrty I get a java.rmi.ConnectIOException. I am honestly lost as to what I need to do to fix this.

code

Server

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

public class Server {
    public static void main(String[] args) throws Exception {
        
        HelloClass Obj = new HelloClass();

        Registry registry = LocateRegistry.getRegistry();

        registry.bind("Hello", Obj);

        System.out.println("Server is live");
    }
}

Client

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


public class Client {
    public static void main(String[] args) throws Exception{
        
        Registry registry = LocateRegistry.getRegistry();

        Hello hello = (Hello) registry.lookup("Hello");

        String n = hello.Hello();

        System.out.println(n);
    }
}

Hello (interface)

import java.rmi.*;

public interface Hello extends Remote {

    public String Hello() throws RemoteException;

}

HelloClass

import java.rmi.server.UnicastRemoteObject;

public class HelloClass extends UnicastRemoteObject implements Hello  {

    public HelloClass() throws Exception{
        super();
    }

    public String Hello(){
        return "Hello world!";
    }

}

The error

"C:\Program Files\Java\jdk1.8.0_144\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.4\lib\idea_rt.jar=57417:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_144\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\rt.jar;C:\Users\Roman\Desktop\RMI3\out\production\RMI3" Server
Exception in thread "main" java.rmi.ConnectIOException: Exception creating connection to: 192.168.2.21; nested exception is: 
    **"C:\Program Files\Java\jdk1.8.0_144\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.4\lib\idea_rt.jar=57417:C:\Program Files\JetBrains\IntelliJ IDEA 2019.3.4\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_144\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_144\jre\lib\rt.jar;C:\Users\Roman\Desktop\RMI3\out\production\RMI3" Server
Exception in thread "main" java.rmi.ConnectIOException: Exception creating connection to: 192.168.2.21; nested exception is: 
    java.net.SocketException: Permission denied: connect
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:631)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:338)
    at sun.rmi.registry.RegistryImpl_Stub.bind(RegistryImpl_Stub.java:60)
    at Server.main(Server.java:15)
Caused by: java.net.SocketException: Permission denied: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:211)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
    ... 5 more
**
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:631)
    at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
    at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
    at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:338)
    at sun.rmi.registry.RegistryImpl_Stub.bind(RegistryImpl_Stub.java:60)
    at Server.main(Server.java:15)
Caused by: java.net.SocketException: Permission denied: connect
    at java.net.DualStackPlainSocketImpl.connect0(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at java.net.Socket.connect(Socket.java:538)
    at java.net.Socket.<init>(Socket.java:434)
    at java.net.Socket.<init>(Socket.java:211)
    at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
    at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:148)
    at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
    ... 5 more
java rmi permission-denied rmiregistry
Original Q&A
1

There are 1 answers

3
Kousik Mandal On BEST ANSWER

In Server class you are retrieving remote object registry reference by calling LocateRegistry.getRegistry() method.

As hostname and port not passed hence internally hostname will be derived using java.net.InetAddress.getLocalHost().getHostAddress() api.

As per error message hostname is getting derived as 192.168.2.21, but on that IP attempt to create a socket in port 1099 is giving Permission denied error.

The host from where you are running Server class,

Is that node has IP_ADDRESS 192.168.2.21 ?

You may check using

ipconfig /all

You can check using java.net.InetAddress.getLocalHost().getHostAddress() api.

I think better you may try to pass hostname and port to LocateRegistry.getRegistry("127.0.0.1",1099) method. Changes are in Server and Client code.

Server.java

package rmi.learning;

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

public class Server {
    public static void main(String[] args) throws Exception {
        try {
            HelloClass Obj = new HelloClass();
            Registry registry = LocateRegistry.getRegistry("127.0.0.1", 1099);
            System.out.println("registry=" + registry);
            registry.bind("Hello", Obj);
            System.out.println("Server is live");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

Client.java

package rmi.learning;

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


public class Client {
    public static void main(String[] args) throws Exception{
        
        Registry registry = LocateRegistry.getRegistry("127.0.0.1",1099);

        Hello hello = (Hello) registry.lookup("Hello");

        String n = hello.Hello();

        System.out.println(n);
    }
}

I have put all classes in rmi.learning package.

Hello.java

package rmi.learning;

import java.rmi.*;

public interface Hello extends Remote {

    public String Hello() throws RemoteException;

}

HelloClass.java

package rmi.learning;

import java.rmi.RemoteException;
import java.rmi.server.UnicastRemoteObject;

public class HelloClass extends UnicastRemoteObject implements Hello {

    protected HelloClass() throws RemoteException {
        super();
    }

    public String Hello() {
        return "Hello world!";
    }
}

Start rmi registry service

start  d:\Java\jdk1.8.0_261\bin\rmiregistry

From a command prompt: Execute Server

cd d:\workspace_europa\StackOverflow\bin

start /B  D:\Java\jdk1.8.0_261\bin\java.exe -classpath .;rmi -Djava.rmi.server.codebase=file:rmi/ rmi.learning.Server

Output:

registry=RegistryImpl_Stub[UnicastRef [liveRef: [endpoint:[127.0.0.1:1099](remote),objID:[0:0:0, 0]]]]
Server is live

From a command prompt: Execute Client

D:\Java\jdk1.8.0_261\bin\java.exe -classpath .  rmi.learning.Client

Output:

Hello world!

More investigation:

I was trying to reproduce this issue, I connect to internet via router. Once I connect to wifi then my router is assigning IP address 192.168.0.102. java.net.InetAddress.getLocalHost().getHostAddress() api return IP ADDRESS as 192.168.0.102

Wireless LAN adapter Wi-Fi:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : xxxx::xxxx:xxxx:xxxx:xxxx%18
   IPv4 Address. . . . . . . . . . . : 192.168.0.102
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.1

If I try to bind rmi service to 192.168.0.102 in port 1099 then it's working fine.

But if I connect to VPN then one new IP is assigned to my host. While connected to VPN, IP 192.168.0.102 is no more resolvable and my machine IP_ADDRESS is getting changed. This time if I try to bind rmi service to IP 192.168.0.102 then getting error java.net.SocketException: Permission denied: connect.

Hence the the error is coming if the IP ADDRESS is not no more applicable for current node.

In many places I have seen people are suggesting to use -Djava.net.preferIPv4Stack=true also. While running Server.class you may try similar

start /B  D:\Java\jdk1.8.0_261\bin\java.exe -Djava.net.preferIPv4Stack=true -classpath .;rmi -Djava.rmi.server.codebase=file:rmi/ rmi.learning.Server

Even some places people are saying about disabling any Anti Virus running on the system, you may check that possibility also.

Related Questions in JAVA

Related Questions in RMI

Related Questions in PERMISSION-DENIED

Related Questions in RMIREGISTRY

Popular Questions

Popular Tags

javascript python java c# php android html jquery c++ css ios sql mysql r reactjs node.js arrays c asp.net json python-3.x ruby-on-rails .net sql-server swift django angular objective-c pandas excel

Trending Questions