我从事两个项目。一个使用Spring Boot实现微服务，另一个使用JavaSE客户端。在服务器端，我实现了使用RmiServiceExporter导出的RMI服务。客户评级我调用该服务，并且当我调用数据插入方法时一切正常，但是当我调用getter方法以检索数据时，我有一个异常，因为我一点都不了解
@Entity
@Table(name = "sgsp_user")
public class User implements Serializable {
@Id
@Column(nullable=false,updatable = false)
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(nullable = false,unique = true,name = "usr_name")
private String username;
@Column(nullable = false,name = "user_mdp")
private String password;
@ManyToMany(fetch = FetchType.LAZY)
@JoinTable(
name = "user_roles",
joinColumns = @JoinColumn(name = "user_fk"),
inverseJoinColumns = @JoinColumn(name = "roles_fk")
)
private List<Role> roles;
private short status;
private short activate;
public User(String username, String password, short status, short activate) {
this.username = username;
this.password = password;
this.status = status;
this.activate = activate;
}
public User() {
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public List<Role> getRoles() {
return roles;
}
public void setRoles(List<Role> roles) {
this.roles = roles;
}
public short getStatus() {
return status;
}
public void setStatus(short status) {
this.status = status;
}
public short getActivate() {
return activate;
}
public void setActivate(short activate) {
this.activate = activate;
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
User user = (User) o;
return status == user.status &&
activate == user.activate &&
Objects.equals(id, user.id) &&
Objects.equals(username, user.username) &&
Objects.equals(password, user.password);
}
@Override
public int hashCode() {
return Objects.hash(id, username, password, status, activate);
}
}
@Service
public class UserService {
@Autowired
private UserRepository userRepo;
public User saveUser(User user){
return this.userRepo.save(user);
}
public void deleteUser(Long id){
this.userRepo.deleteById(id);
}
public void deleteUser(User user){
this.userRepo.delete(user);
}
public User updateUser(User user){
return this.userRepo.save(user);
}
public User getUser(String username,String password){
return this.userRepo.getUserByUsernameAndPassword(username,password);
}
public Optional<User> getUser(Long id){
return userRepo.findById(id);
}
public long countUser(Role role){
return this.userRepo.count();
}
public boolean exist(String username){
return (this.userRepo.getUserByUsername(username) != null);
}
}
public interface UserRemote extends Remote{
public User saveUser(User user) throws RemoteException;
public boolean connexion(String username, String password) throws RemoteException;
public long countUsers(Role role) throws RemoteException;
public boolean userExist(String username) throws RemoteException;
public Optional<User> getUser(Long id) throws RemoteException;
}
@Component
public class UserRemoteService implements UserRemote {
@Autowired
private UserService userService;
@Override
public User saveUser(User user) throws RemoteException {
return this.userService.saveUser(user);
}
@Override
public boolean connexion(String username, String password) throws RemoteException {
if(this.userService.getUser(username,password)!= null){
return true;
}else{
return false;
}
}
@Override
public long countUsers(Role role) throws RemoteException {
return this.userService.countUser(role);
}
@Override
public boolean userExist(String username) throws RemoteException {
return this.userService.exist(username);
}
@Override
public Optional<User> getUser(Long id) throws RemoteException {
return userService.getUser(id);
}
}
@Configuration
public class ServiceRMIExporter {
private int port = 5400;
public SimpleJaxWsServiceExporter jaxWsServiceExporter(){
return new SimpleJaxWsServiceExporter();
}
@Bean
@Autowired
public RmiServiceExporter getUserRemoteService(UserRemote userService){
RmiServiceExporter exporter = new RmiServiceExporter();
exporter.setService(userService);
exporter.setServiceName("userservice");
exporter.setRegistryPort(port);
return exporter;
}
}
public class TestRmi {
public static void main(String[] args) {
try {
UserRemote stub = (UserRemote) Naming.lookup("rmi://localhost:5400/userservice");
Optional<User> usr = stub.getUser(1L);
System.out.println(usr.toString());
} catch (MalformedURLException | NotBoundException | RemoteException e) {
e.printStackTrace();
}
}
}
我使用java.policy和 java -Djava.security.manager -Djava.security.policy = C：\ Users \ Richie \ IdeaProjects \ sgsp \ src \ sgsp \ admin \ res \ java.policy
没有成功
grant
{
permission java.net.SocketPermission "*:80-65535","connect,accept,listen,resolve";
permission java.security.AllPermission;
permission java.net.SocketPermission "localhost:5400-", "listen";
};
我得到的异常如下：
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.util.Optional
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invokeRemoteMethod(Unknown Source)
at java.rmi.server.RemoteObjectInvocationHandler.invoke(Unknown Source)
at com.sun.proxy.$Proxy0.getUser(Unknown Source)
at com.testRMI.TestRmi.main(TestRmi.java:19)
Caused by: java.io.WriteAbortedException: writing aborted; java.io.NotSerializableException: java.util.Optional
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at sun.rmi.server.UnicastRef.unmarshalValue(Unknown Source)
... 5 more
Caused by: java.io.NotSerializableException: java.util.Optional
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:290)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:371)
at sun.rmi.transport.Transport$1.run(Transport.java:200)
at sun.rmi.transport.Transport$1.run(Transport.java:197)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:196)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682)
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)
答案 0 :(得分：0)
我找到了一个解决方案：我下载了jar文件并将其放置在我的客户端项目中，并且一切正常：这些文件如下：
感谢您的关注