RMI UnmarshalException仅限ClassNotFoundException服务器

时间：2013-11-20 00:04:23

标签： java rmi classnotfoundexception

我已经学习了几个关于运行RMI应用程序的教程。但是，我似乎无法使它工作，因为我一直陷入同样的​​例外。

此时我只运行服务器，因此不涉及客户端通信。

我有一个简单的RMI程序，包括：

  1. 服务器类SortServer
  2. 界面ISortFactory<T>
  3. 实施QuickSortFactory<T>
  4. RMIUtils班级
  5. 政策文件allpermissions.policy

    6. 政策文件内容 

    grant { 
    permission java.security.AllPermission;
};

    RMIUtils 

    static {
    // Set policy
    setPolicy();

    // Set Security manager if not present
    if(System.getSecurityManager() == null) {
        System.setSecurityManager(new SecurityManager());
    }

    setHost("127.0.0.1");
}

public static void addCodeBaseFor(Class<?> clazz) {
    System.setProperty("java.rmi.server.codebase", clazz.getProtectionDomain().getCodeSource().getLocation().toString());
}

public static void setPolicy() {
    System.setProperty("java.security.policy", PolicyFileLocator.getLocationOfPolicyFile());
}

public static void setHost(String hostAddress) {
    System.setProperty("java.rmi.server.hostname", hostAddress);
}

public static String getHost() {
    return System.getProperty("java.rmi.server.hostname");
}

    SortServer 

    public static void main(String[] args) throws RemoteException, MalformedURLException, AlreadyBoundException {
    RMIUtils.addCodeBaseFor(ISortFactory.class);

    ISortFactory<String> strQSFactory = new QuickSortFactory<String>();
    // Same error: Naming.bind("rmi://"+RMIUtils.getHost()+"/quicksortfactory", strQSFactory);

    Registry registry = LocateRegistry.getRegistry();
    registry.rebind("quicksortfactory-string", strQSFactory);
}

    ISortFactory 

    public interface ISortFactory<T> extends Remote {
    public ISorter<T> createSorter() throws RemoteException;
}

    实施QuickSortFactory 

    public class QuickSortFactory<T> extends UnicastRemoteObject implements ISortFactory<T> {
    private static final long serialVersionUID = -4856366323843718656L;

    public QuickSortFactory() throws RemoteException {
        super();
    }

    @Override
    public ISorter<T> createSorter() throws RemoteException {
        return new QuickSort<T>();
    }
}

    ISorter，QuickSorter和引用的对象 ISorter扩展Remote，其方法抛出RemoteException。 QuickSort扩展SortLogic并实施ISorter。它的方法抛出RemoteException s。 SortLogic延伸UnicastRemoteObject。它的方法抛出RemoteException s。

    因为我使用JDK 1.5+，所以我不需要担心存根。 rmir​​egistry运行正常，或者我会有不同的错误。

    文字控制台输出 

    2013-11-20 00:57:00 DEBUG RMIUtils:33 - Policy file path changed to 'C:\Users\Mark\AppData\Local\Temp\rmi-sorter5248481413010560777.policy'
2013-11-20 00:57:00 DEBUG RMIUtils:38 - RMI hostname set to 127.0.0.1
2013-11-20 00:57:00 DEBUG RMIUtils:27 - Codebase path added: file:/F:/Development/Git/Personal/parallel-sorter/bin/
Exception in thread "main" java.rmi.ServerException: RemoteException occurred in server thread; nested exception is: 
    java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
    java.lang.ClassNotFoundException: nl.marktielemans.rmisorter.server.factory.ISortFactory
    at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:400)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:248)
    at sun.rmi.transport.Transport$1.run(Transport.java:159)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
    at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:255)
    at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:233)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:359)
    at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
    at nl.marktielemans.rmisorter.server.SortServer.main(SortServer.java:42)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is: 
    java.lang.ClassNotFoundException: nl.marktielemans.rmisorter.server.factory.ISortFactory
    at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
    at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:390)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:248)
    at sun.rmi.transport.Transport$1.run(Transport.java:159)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:155)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:535)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:790)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:649)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:895)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:918)
    at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: nl.marktielemans.rmisorter.server.factory.ISortFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:249)
    at sun.rmi.server.LoaderHandler.loadProxyInterfaces(LoaderHandler.java:709)
    at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:653)
    at sun.rmi.server.LoaderHandler.loadProxyClass(LoaderHandler.java:590)
    at java.rmi.server.RMIClassLoader$2.loadProxyClass(RMIClassLoader.java:628)
    at java.rmi.server.RMIClassLoader.loadProxyClass(RMIClassLoader.java:294)
    at sun.rmi.server.MarshalInputStream.resolveProxyClass(MarshalInputStream.java:242)
    at java.io.ObjectInputStream.readProxyDesc(ObjectInputStream.java:1535)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1491)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1748)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1327)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:349)
    ... 12 more

    没有代码库参数

    我已经尝试过没有codebase参数，但我不知道如何在我读到的RMI类路径中包含这些类。

    我尝试使用SortServer中的代码启动注册表，如上所述，以及从我RegistryLocator.getRegistry()目录中打开的命令行启动注册表。不过，我会得到同样的错误。

1 个答案:

答案 0 :(得分：2)

java.lang.ClassNotFoundException: nl.marktielemans.rmisorter.server.factory.ISortFactory
...
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)

注册表在其CLASSPATH中没有该类。

如果您正在使用java.rmi.server.codebase属性，则需要在导出任何远程对象之前设置它，并且代码库需要是注册表和客户端可以使用的内容。

public static void addCodeBaseFor(Class<?> clazz) {
    System.setProperty("java.rmi.server.codebase", clazz.getProtectionDomain().getCodeSource().getLocation().toString());
}

这不起作用。无法从客户端看到包含JAR文件的服务器上的位置。通常它是一个http：或ftp：URL。

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