如何解决RMI注册表权限被拒绝
我正在尝试使用Java RMI,但是当我的组件尝试绑定(甚至连接)到 rmiregistry 时,我一直遇到错误。每当我尝试将任何东西绑定到 rmiregisrty 时,我都会收到java.rmi.ConnectIOException。老实说,我对解决此问题需要做些什么。
代码
服务器
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");
}
}
客户
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);
}
}
你好(界面)
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!";
}
}
错误
"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
解决方法
在Server类中,您正在通过调用LocateRegistry.getRegistry()
方法来检索远程对象注册表引用。
由于未传递主机名和端口,因此内部将使用java.net.InetAddress.getLocalHost().getHostAddress()
api派生主机名。
根据错误消息,主机名派生为192.168.2.21,但是在该IP上尝试在端口1099中创建套接字的操作却给出了“权限被拒绝”错误。
运行服务器类的主机,
该节点是否具有IP_ADDRESS 192.168.2.21吗?
您可以使用
进行检查ipconfig /all
您可以使用java.net.InetAddress.getLocalHost().getHostAddress()
api进行检查。
我认为最好您尝试将主机名和端口传递给LocateRegistry.getRegistry("127.0.0.1",1099)
方法。更改包含在服务器和客户端代码中。
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);
}
}
我已将所有类放入rmi.learning包中。
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!";
}
}
启动rmi注册服务
start d:\Java\jdk1.8.0_261\bin\rmiregistry
在命令提示符下: 执行服务器
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
输出:
registry=RegistryImpl_Stub[UnicastRef [liveRef: [endpoint:[127.0.0.1:1099](remote),objID:[0:0:0,0]]]]
Server is live
在命令提示符下: 执行客户端
D:\Java\jdk1.8.0_261\bin\java.exe -classpath . rmi.learning.Client
输出:
Hello world!
更多调查:
我试图重现此问题,我通过路由器连接到Internet。连接到wifi后,路由器将分配IP地址192.168.0.102。
java.net.InetAddress.getLocalHost().getHostAddress()
api返回IP地址为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
如果我尝试将rmi服务绑定到端口1099上的192.168.0.102,那么它可以正常工作。
但是,如果我连接到VPN,则将一个新IP分配给我的主机。连接到VPN时,IP 192.168.0.102不再可解析,并且我的机器IP_ADDRESS正在更改。这次,如果我尝试将rmi服务绑定到IP 192.168.0.102,则会收到错误java.net.SocketException: Permission denied: connect.
如果IP地址不再适用于当前节点,则会出现错误。
我在很多地方都看到有人建议使用 -Djava.net.preferIPv4Stack = true也是如此。在运行Server.class时,您可以尝试类似的
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
即使人们在某些地方说要禁用系统上运行的任何反病毒软件,您也可以检查这种可能性。
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