Java RMI客户端访问被拒绝

我正在编写一个小型Java RMI服务器和客户端程序。 我花了一些时间试图找出错误消息但没有成功。

客户端生成以下错误：

试图连接到：127.0.0.1：3232错误!!!：StockClient：main：无法连接到服务器：java.rmi.UnmarshalException：错误解组返回标头; 嵌套exception是：java.rmi.UnmarshalException：错误解组返回标头; 嵌套exception是：sun.rmi.transport.StreamRemoteCall.executeCall（StreamRemoteCall.java:209）的sun.rmi.server.UnicastRef.invoke（UnicastRef.java:359）sun中的java.io.EOFException java.io.EOFException StockClient.StockClient.main（StockClient.java:44）中的.rmi.registry.RegistryImpl_Stub.lookup（未知来源）引起：java.io.DataInputStream.readByte（DataInputStream.java：250）的java.io.EOFException .rmi.transport.StreamRemoteCall.executeCall（StreamRemoteCall.java:195）… 3个其他

仅在客户端尝试连接时，服务器才会出现以下错误。

此地址= localhost / 127.0.0.1，port = 3232线程“RMI TCP连接（空闲）”中的exceptionjava.security.AccessControlException：java.security中的访问被拒绝（java.net.SocketPermission 127.0.0.1:62586 accept，resolve） .AccessControlContext.checkPermission（AccessControlContext.java:374）在java.security.AccessController.checkPermission（AccessController.java:549）java.lang.SecurityManager.checkPermission（SecurityManager.java:532）java.lang.SecurityManager.checkAccept（ SecurityManager.java:1157）sun.rmi.transport.tcp.TCPTransport $ ConnectionHandler.checkAcceptPermission（TCPTransport.java:636）at sun.rmi.transport.tcp.TCPTransport.checkAcceptPermission（TCPTransport.java:275）at sun.rmi .transport.Transport $ 1.run（Transport.java:158）位于sun.rmi.transport的sun.rmi.transport.Transport.serviceCall（Transport.java:155）的java.security.AccessController.doPrivileged（Native Method）。 tcp.TCPTransport.handleMessages（TCPTransport.java:535）at sun.rmi.transport.tcp.TCPTransport $ ConnectionHandler。 run0（TCPTransport.java:790）在java.util.concurrent.ThreadPoolExecutor的sun.rmi.transport.tcp.TCPTransport $ ConnectionHandler.run（TCPTransport.java:649）java的java.Man.runTask（ThreadPoolExecutor.java:886） java.lang.Thread.run中的.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:908）（Thread.java:680）

由于服务器错误，我很确定它是安全性或注册表错误，服务器的安全策略是：

grant {permission java.security.AllPermission; };

并使用以下参数运行

-Djava.security.policy = client.policy

我已经尝试了我能找到的所有东西，但似乎还是继续绕圈子。

相关方法：

服务器：

public static void main(String[] args) {//main(...) starts // set up the data structures and data //add users //Users hard coded as this is an example proof on concept program //Names and passwords not hashed for simplicity User alpha = new User("Alpha", "AlphaPass"); User omega = new User("Omega", "OmegaPass"); users.add(alpha); users.add(omega); //startup the RMI server try { System.setSecurityManager(new RMISecurityManager()); StockServer server = new StockServer(); StockServerInterface inter = (StockServerInterface) UnicastRemoteObject.exportObject (server,0); // create the registry and bind the name and object. registry = LocateRegistry.createRegistry(thisPort); registry.rebind("StockServer", inter); } catch (Exception e) { System.out.println("Unable to create StockServer: " + e); e.printStackTrace(); System.exit(1); } }//main(...) ends /** * Constructor for StockServer * * @throws RemoteException */ public StockServer() throws RemoteException { //try to get the host machine's IP address try { // get the address of this host. thisAddress = (InetAddress.getLocalHost()).toString(); } catch (Exception e) { throw new RemoteException("can't get inet address. " + e); } //Set the port thisPort = 3232; //Print out the server address and port System.out.println("this address=" + thisAddress + ",port=" + thisPort); } 

客户：

 private static StockServerInterface stockServer; static public void main(String args[]) { Registry registry; //get the server address from the args String serverAddress = args[0]; //get the server port from the args String serverPort = args[1]; //Let the user know we are about to try to connect System.out.println("Trying to connect to: " + serverAddress + ":" + serverPort); try { // get the registry registry = LocateRegistry.getRegistry( serverAddress, (new Integer(serverPort)).intValue()); // look up the remote object stockServer = (StockServerInterface) (registry.lookup("StockServer")); //Authenticate the user authenticate(); //setup the hashset HashSet hashStockSet = null; //setup the hashset of desired stocks try { hashStockSet = getHashSet(); } catch (IOException e) { e.printStackTrace(); System.exit(1); } catch (ClassNotFoundException e) { e.printStackTrace(); System.exit(1); } //bit of a heavy handed infinte loop so we continue to get the loop while(true) { //Run the ticker ticker(hashStockSet); } // call the remote method } catch (RemoteException e) { System.out.println("ERROR!!!: StockClient: main: Could not connect to the server: "+e); e.printStackTrace(); } catch (NotBoundException e) { System.out.println("ERROR!!!: StockClient: main: Could not connect to the server: "+e); e.printStackTrace(); } 

Answer 1

除非客户端依赖代码库function为服务器提供类，否则您不需要RMI服务器中的SecurityManager 。 删除它，或调试.policy文件。 很明显，你写的那个没有加载。

使用-Djava.security.debug=access,failure运行服务器，您将看到所有安全域从中获取配置的位置，以及在抛出exception时失败的域。