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我试图通过RMI调用返回一个普通的类。我的服务器拥有一个名为GameState的类的实例，我想通过它的方法从客户端应用程序执行操作。所以如果一个返回一个int或者某个东西，RMI工作的很好，但是当试图返回GameState（GameServer java文件中定义的一个类）时，会发生以下错误（游戏状态声明不是public，protected或private）：螺纹通过RMI调用返回类实例
异常 “主要” java.lang.IllegalAccessError：试图从类$ Proxy0 在$ Proxy0.getGameState（来源不明） 在GameClient.login（GameClient.java:204） 在GameClient访问类的游戏状态.main（GameClient.java:168）
所以，我猜客户端应用程序知道如何GameState看起来，但没有任何访问它？
我试图让GameState在它自己的文件中成为一个公共类，但不同的连接客户端应用程序获取它们自己的GameState，所以它看起来好像不从服务器获取它。
下面是一些代码，我认为这是相关的：
远程接口：
import java.rmi.*;
public interface ServerInterface extends Remote
{
public GameState getGameState() throws RemoteException;
}
一些，如果服务器代码：
public class GameServer extends UnicastRemoteObject implements ServerInterface {
/**
*
*/
private static final long serialVersionUID = -6633456258968168102L;
private final static int DEFAULT_NAMING_PORT = 9955; // TODO: IMPORTANT - change this to a group-specific number,
// e.g., 2000 + group number. The number should be the same
// as in GameClient.java.
private final GameState m_state;
public static void main(String[] args) {
//the variables: port and host etc it configurated here, but has nothing to do with the RMI problem.
try {
GameServer instance = new GameServer(players);
System.out.print("Setting up registry on "+host+":"+port+" ... ");
//Set up an unrestricted security manager.
if (System.getSecurityManager() == null) {
// Set security manager to an instance of a dynamically created
// subclass of RMISecurityManager with the checkPermission() method overloaded
System.setSecurityManager(
new RMISecurityManager() {
@Override
public void checkPermission(Permission permission) {
}
}
);
}
// Create a registry for binding names (name server)
Registry naming = LocateRegistry.createRegistry(port);
System.out.println("done.");
String rmiObjectName = "GeschenktServer";
System.out.print("Binding name "+rmiObjectName+" ... ");
naming.rebind(rmiObjectName, instance);
System.out.println("done.");
} catch(RemoteException e) {
System.err.println("Could not start server: "+e);
System.exit(-1);
}
}
//the rest of the server code....
//the GameState declared in the same file
class GameState implements java.io.Serializable {
private static final long serialVersionUID = 545671487061859760L;
//the rest of the Game state code.
下面是一些客户端的代码：
private void login() {
try {
System.out.println("Connecting to server on host "+m_host+".");
// Set up an unrestricted security manager. In the server we trust.
// See GameServer.java for code explanation.
if (System.getSecurityManager() == null) {
System.setSecurityManager(
new RMISecurityManager() {
@Override
public void checkPermission(Permission permission) {
}
}
);
}
System.out.print("Locating registry on "+m_host+":"+m_port+" ... ");
Registry naming = LocateRegistry.getRegistry(m_host, m_port);
System.out.println("done.");
String name = "GeschenktServer";
System.out.print("Looking up name "+name+" ... ");
m_server = (ServerInterface) naming.lookup(name);
System.out.println("done.");
// TODO: Connect the player, i.e., register the player with the server.
// Make sure that the player cannot register if there are already enough players.
m_Id = m_server.getGameState().loginPlayer(m_name); //this line is causing the error...
if(m_Id < 0)
System.exit(0);
System.out.println("Server connection successful.");
m_window = new GameWindow(m_server, m_name, m_Id);
m_window.run();
} catch (Exception e) {
System.out.println("Connection failed - "+e);
System.exit(1);
}
}
}
我使用eclipse来完成所有这些工作，并且基于我在eclipse中有关RMI的红色，rmic和那些东西不再需要，我是对的？
那么任何人有任何想法？
在此先感谢！
这不会帮助。它不是ClassNotFoundException或NoClassDefFoundError。这根本不是一个代码库问题。 – EJP 2012-02-10 00:12:46
问题是GameState是封装私有的，错误非常明显。 – bestsss 2012-02-10 00:25:22
@bestsss：你说得对，那是我错过的一个明显问题。感谢您的更正！ – joergl 2012-02-10 09:04:14