我遵循了几个关于运行 RMI 应用程序的教程。但是,我似乎无法让它工作,因为我一直卡在同一个异常上。
我目前只运行一个服务器,因此不涉及客户端通信。
我有一个简单的 RMI 程序,包括:
- 服务器类
SortServer
- 一个接口(interface)
ISortFactory<T>
- 一个实现
QuickSortFactory<T>
- 安
RMIUtils
类 - 策略文件
allpermissions.policy
策略文件内容
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");
}
排序服务器
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;
}
实现 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 和引用对象
ISorter
延伸Remote
及其方法抛出 RemoteException
秒。
QuickSort
延伸SortLogic
并实现 ISorter
.它的方法抛出 RemoteException
秒。
SortLogic
延伸UnicastRemoteObject
.它的方法抛出 RemoteException
因为我使用 JDK 1.5+,所以我不需要担心 stub 问题。 rmiregistry 运行良好,否则我会遇到不同的错误。
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
我尝试过不使用 codebase 参数,但不确定如何按照我阅读的方式将这些类包含在 RMI 类路径中。
我试过从 SortServer
中的代码启动注册表使用 RegistryLocator.getRegistry()
如上所述,以及从我的 bin
中打开的命令行启动它目录。尽管如此,我还是会得到同样的错误。
最佳答案
java.lang.ClassNotFoundException: nl.marktielemans.rmisorter.server.factory.ISortFactory
...
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
注册表在其 CLASSPATH 中没有可用的类。
如果您正在使用 java.rmi.server.codebase
属性,您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());
}
这行不通。从客户端看不到包含 JAR 文件在服务器上的位置。一般为 http: 或 ftp: URL。
关于java - 仅限 RMI UnmarshalException ClassNotFoundException 服务器,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/20084829/