rmi

need help to run RMI Registry

由 China☆狼群 提交于 2020-01-02 07:33:19
问题 I'm implementing a simple RMI Server Client program in JAVA. I'm new to this actually. i have four java files. Stack.java import java.rmi.*; public interface Stack extends Remote{ public void push(int p) throws RemoteException; public int pop() throws RemoteException; } StackImp.java import java.rmi.*; import java.rmi.server.*; public class StackImp extends UnicastRemoteObject implements Stack{ private int tos, data[], size; public StackImp()throws RemoteException{ super(); } public StackImp

Is rmic still needed?

由 这一生的挚爱 提交于 2020-01-02 01:59:08
问题 Is it true that the rmi interface compiler is not needed for java 1.5 or newer and that just compiling the java file where the UnicastRemoteObject is defined with javac is enough?Rmic still works and it generates a stub class file if you give it the class file of the implementation of the remote object. 回答1: According to the RMI tutorial: http://download.oracle.com/javase/tutorial/rmi/overview.html Compiling Sources As with any Java program, you use the javac compiler to compile the source

EJB到底是什么？

由 拈花ヽ惹草 提交于 2020-01-01 23:17:12
1. 我们不禁要问，什么是"服务集群"？什么是"企业级开发"？ 既然说了EJB 是为了"服务集群"和"企业级开发"，那么，总得说说什么是所谓的"服务集群"和"企业级开发"吧！这个问题其实挺关键的，因为J2EE 中并没有说明白，也没有具体的指标或者事例告诉广大程序员什么时候用EJB 什么时候不用。于是大家都产生一些联想，认为EJB"分布式运算"指得是"负载均衡"提高系统的运行效率。然而，估计很多人都搞错了，这个"服务群集"和"分布式运算"并没有根本解决运行负载的问题，尤其是针对 数据库 的应用系统。 为什么？ 我们先把EJB 打回原形给大家来慢慢分析。 2. 把EJB 掰开了揉碎了 我们把EJB 的概念好好的分析一下，看看能发现些什么蛛丝马迹。 3.1 EJB 概念的剖析 我们先看一下，EJB 的官方解释： 商务软件的核心部分是它的业务逻辑。业务逻辑抽象了整个商务过程的流程，并使用计算机语言将他们实现。 …… J2EE 对于这个问题的处理方法是将业务逻辑从客户端软件中抽取出来，封装在一个组件中。这个组件运行在一个独立的服务器上，客户端软件通过网络调用组件提供的服务以实现业务逻辑，而客户端软件的功能单纯到只负责发送调用请求和显示处理结果。在J2EE 中，这个运行在一个独立的服务器上，并封装了业务逻辑的组件就是EJB（Enterprise Java Bean）组件

Java RMI与RPC的区别

由 安稳与你 提交于 2020-01-01 09:03:21
文章转自http://www.cnblogs.com/ygj0930/p/6542811.html 一：RPC 远程过程调用 RPC（Remote Procedure Call Protocol）远程过程调用协议，通过网络从远程计算机上请求调用某种服务。 一次RPC调用的过程大概有10步： 　　1.执行客户端调用语句，传送参数 　　2.调用本地系统发送网络消息 　　3.消息传送到远程主机 　　4.服务器得到消息并取得参数 　　5. 根据调用请求以及参数执行远程过程（服务） 　　6.执行过程完毕，将结果返回服务器句柄 　　7.服务器句柄返回结果，调用远程主机的系统网络服务发送结果 　　8.消息传回本地主机 　　9.客户端句柄由本地主机的网络服务接收消息 　　10.客户端接收到调用语句返回的结果数据 二：RMI 远程方法调用 RMI:远程方法调用(Remote Method Invocation)。能够让在客户端 Java 虚拟机上的对象像调用本地对象一样调用服务端java 虚拟机中的对象上的方法。 RMI远程调用步骤： 1，客户调用客户端辅助对象stub上的方法 2，客户端辅助对象stub打包调用信息（变量，方法名），通过网络发送给服务端辅助对象skeleton 3，服务端辅助对象skeleton将客户端辅助对象发送来的信息解包，找出真正被调用的方法以及该方法所在对象 4

Java RMI Tutorial - AccessControlException: access denied (java.io.FilePermission

由 坚强是说给别人听的谎言 提交于 2020-01-01 04:10:48
问题 Yesterday I tried to get started with Java RMI. I found this sun tutorial (http://java.sun.com/docs/books/tutorial/rmi/index.html) and started with the server implemantation. But everytime I start the pogram (the rmiregistry is running) I get an AccessControlException with the following StackTrace: LoginImpl exception: java.security.AccessControlException: access denied (java.io.FilePermission \\\C\ProjX\server\serverProj\bin\usermanager read) at java.security.AccessControlContext

Cross context communication between two web application deployed on same tomcat server

由 巧了我就是萌 提交于 2020-01-01 03:41:09
问题 I have two web application, webAppMaster and webAppSlave , deployed in same tomcat server. Now in webAppMaster application, there is a java class, RequestHandler whose processRequest method takes a customObject1 as parameter and returns customObject2 . Now, from RequestCreator class of webAppSlave application, I want to invoke processRequest method of RequestHandler class of webAppMaster application. How this should be done ? Thanks in advance. 回答1: You need to talk between applications as if

Cannot establish RMI connection to remote machine [duplicate]

由 青春壹個敷衍的年華 提交于 2019-12-31 04:02:09
问题 This question already has answers here : RMI cannot connect to remote server (2 answers) Closed 6 years ago . I can't seem to connect 2 machines using RMI. To make sure there wasn't something wrong with my code I copied the simple example from wikipedia (http://en.wikipedia.org/wiki/Java_remote_method_invocation) and I edited the code to print out a simple int. I tried giving all permissions and turning all the firewalls off and I still get this error: java.rmi.ConnectException: Connection

Is it necessary/important to set a classpath in the RMI registry?

由 落花浮王杯 提交于 2019-12-31 01:57:25
问题 Is it necessary or important to set a class path in the registry for RMI to work correctly? 回答1: Contrary to @Rahul's baseless assertion, it is indeed necessary to set a CLASSPATH for the RMI Registry, unless: You are starting the Registry from a directory which is also the head of a package structure of .class files. You are using the codebase feature, or You are starting the Registry in the same JVM as your RMI remote obects, via LocateRegistry.createRegistry(). If you don't do one of these

How to close rmi client safely?

由 余生长醉 提交于 2019-12-30 14:43:12
问题 I want to close all connections between client and server with RMI protocol. Remote r= Naming.lookup("rmi://192.168.105.38:9121/AccountRMIService"); if(r instanceof RmiInvocationWrapper_Stub) { RmiInvocationWrapper_Stub stub = (RmiInvocationWrapper_Stub)r; System.out.println("hashCode="+stub.getRef().hashCode()); } System.out.println(r); //How to close the connection with 'Remote' ? Some code to check rmi status of server: final ThreadLocal<List<Socket>> currentSocket = new ThreadLocal<List

How do I have to configure a RMI environment so that I'm able to use it in a “real” network?

由 你离开我真会死。 提交于 2019-12-30 05:35:05
问题 Because I didn't want to implement a communication protocol for my client-server based application, I implemented a RMI client and a RMI server on both sides for the information exchange between the two components. If I try to use my application by starting the two components on the same machine, everything is working fine. But if I split the components to two different computers (Kubuntu 9.04 within as a virtual machine within an Windows 7 RC environment with disabled firewall and a native
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