这是整个异常:
Computeappengine exceptionRemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: Client.prog (no security manager: RMI class loader disabled)
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: Client.prog (no security manager: RMI class loader disabled)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:334)
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:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
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:142)
at Engine.ComputeappEngine_Stub.executeTask(Unknown Source)
at Client.computeappprog.main(computeappprog.java:23)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: Client.prog (no security manager: RMI class loader disabled)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:294)
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:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.ClassNotFoundException: Client.prog (no security manager: RMI class loader disabled)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:373)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:163)
at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:620)
at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:247)
at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:197)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1574)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1495)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1731)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:350)
at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:306)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:288)
... 9 more
我的客户端包包含两个类 Computeappproj 其中包含 main 和
程序
我已经搜索了 1000 个论坛。没有任何帮助。
希望有积极的东西
还不错
可能是……
最佳答案
问题实际上出在类加载上。当您通过 RMI 传输一些非 jdk 对象(即您自己的类的对象)时，您需要确保 JVM、客户端和服务器在类路径中都有您的自定义类。在您的情况下，服务器缺少 Client.prog 类，因此它无法从二进制表示中重建对象 - 为此需要 Client.prog 类字节码。 通常有两种方法可以解决此问题:
简单的方法:将所有数据传输对象类复制到客户端和服务器的类路径中。所以他们都不会与未知类混淆。对于一个有点严肃的人，您甚至可能想要创建一个带有 DTO 类的单独 JAR 以便于维护。
挑战之一:启用远程类加载。简而言之，这种技术使您的服务器能够在必要时从客户端下载类字节码，反之亦然。这个选项有一个明显的安全问题(下载潜在的不安全代码)，所以它默认被禁用。要启用它，您应该使用定义了 URL 的 -Djava.rmi.server.codebase 属性并设置适当的类加载器(RMIClassloader 或其后代)以使 Java 安全系统满意。这是一些背景理论和故障排除指南的有用链接:link
关于java - 我正在运行 RMI 应用程序但没有安全管理器 : RMI class loader disabled exception comes，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/17351336/