我正在为
java RMI运行Hello World示例
motta@motta-laptop ~/tmp $rmiregistry
2)我启动HTTP服务器以在运行时检索类. download文件夹包含客户端 – 服务器的远程接口
motta@motta-laptop ~/download $java NanoHTTPD 8080
3)我按照java RMI教程的建议启动服务器传递java.rmi.server.codebase属性
motta@motta-laptop ~/server $java -Djava.rmi.server.codebase="http://localhost:8080" WarehouseServer
RMI注册表未联系HTTP服务器并抛出异常(请参阅问题后的详细信息).
但如果我做以下事情
1)使用java.rmi.server.codebase属性启动rmi注册表
motta@motta-laptop ~/tmp $rmiregistry -J-Djava.rmi.server.codebase="http://localhost:8080/"
2)像以前一样启动HTTP服务器
3)没有任何选项启动服务器
motta@motta-laptop ~/server $java WarehouseServer
它有效,但为什么呢?似乎在第一个过程中,RMI注册表忽略了java.rmi.server.codebase属性
谢谢
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我在跑步
java version "1.7.0_21" Java(TM) SE Runtime Environment (build 1.7.0_21-b11) Java HotSpot(TM) 64-Bit Server VM (build 23.21-b01,mixed mode)
RMI注册表的例外
Constructing server implementation... Binding server implementation to registry... 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: Warehouse at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:419) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267) at sun.rmi.transport.Transport$1.run(Transport.java:177) at sun.rmi.transport.Transport$1.run(Transport.java:174) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:173) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:722) at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:273) at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:251) at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:377) at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source) at WarehouseServer.main(WarehouseServer.java:14)
It seems that with the first procedure the RMI registry is ignoring
thejava.rmi.server.codebase
property.
那是对的.原因是,从JDK 7u21开始,java.rmi.server.useCodebaSEOnly属性默认为true,而在以前的版本中默认为false.
当useCodebaSEOnly为false时,RMI Registry(和RMI客户端)使用从服务器传递给它们的代码库.现在默认值为true,注册表和客户端忽略服务器的codebase属性.注册表和客户端必须设置自己的codebase属性以匹配服务器的属性,或者(不推荐)他们可以将useCodebaSEOnly设置为false.有关详细信息,请参见RMI Enhancements in JDK 7.
RMI Tutorial尚未更新以反映此更改.对于那个很抱歉.我会确保它得到更新.