Question

尝试在Person RMI服务器上保存ServerOperation对象时遇到问题。程序给了我很多错误：

    at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:359)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200)
at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:688)
at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:562)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:796)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:677)
at java.base/java.security.AccessController.doPrivileged(AccessController.java:389)
at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:676)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:835)
at java.rmi/sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:283)
at java.rmi/sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:260)
at java.rmi/sun.rmi.server.UnicastRef.invoke(UnicastRef.java:161)
at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(RemoteObjectInvocationHandler.java:209)
at java.rmi/java.rmi.server.RemoteObjectInvocationHandler.invoke(RemoteObjectInvocationHandler.java:161)
at com.sun.proxy.$Proxy6.saveUser(Unknown Source)
at mainMenu.mainMenuController.registerPerson(mainMenuController.java:93)
... 61 more

我已经尝试解决了很多次，但我无法解决。我的代码如下： RMIInterface.java

public interface RMIInterface extends Remote {
    public void saveUser(Person p) throws RemoteException;
    public Person accessUser(String email, String password) throws RemoteException;
    public ArrayList<Book> getAvailableBooks() throws RemoteException;

}

ServerOperation.java

public class ServerOperation extends UnicastRemoteObject implements RMIInterface {

private static final long serialVersionUID = 1L;
private ArrayList<Person> users;
Library library;

protected ServerOperation() throws RemoteException {

    super();
    users = new ArrayList<>();
    try{
        library = new Library();

    } catch(MalformedURLException | NotBoundException e) {
        e.printStackTrace();
    }
}

@Override
public void saveUser(Person p) throws RemoteException {

    System.out.println("name=" + p.getPersonName() + " : surname=" + p.getPersonSurname() + " : email=" + p.getPersonEmail() +
            " : password=" + p.getPersonPassword() + " REGISTERED");
    users.add(p);
}

mainMenuController.java

public class mainMenuController extends UnicastRemoteObject implements Initializable {

private static RMIInterface look_up;

public void registerPerson(ActionEvent e) throws IOException {

    try {

        look_up = (RMIInterface) Naming.lookup("//localhost/MyServer");

        Person p = new Person(registerTabName.getText(), registerTabSurname.getText(),
                registerTabEmail.getText(), registerTabPassword.getText());

        look_up.saveUser(p); // saving user in database

}

public mainMenuController() throws MalformedURLException, RemoteException, NotBoundException {

}

Person.java

public class Person extends UnicastRemoteObject {

...

public Person(String personName, String personSurname, String personEmail, String personPassword) throws MalformedURLException, RemoteException, NotBoundException {
    ...
}

Java RMI在服务器错误时保存对象

0 个答案: