简单EJB客户端调用的问题

最新推荐文章于 2025-08-24 12:49:52 发布

最新推荐文章于 2025-08-24 12:49:52 发布 · 145 阅读

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#EJB #Java #Security #JBoss #.net

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本文介绍了一种使用EJB进行远程调用的方法，并详细记录了客户端代码的实现过程。文章探讨了在不设置和设置安全管理器的情况下遇到的不同权限拒绝异常，并寻求解决方案。

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写好了一个EJB并且也部署到了jboss下面，部署成功，简单说下组成
远程接口 Hello interface 定义了一个业务方法 public String hello()
本地接口 HelloLocal interface 和远程接口一样 public String hello()
Home接口 HelloHome interface
本地Home接口 HelloLocalHome interface
发布到jboss服务器底下成功
客户端代码如下
import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;
import java.rmi.*;
import java.util.*;

//import myejb.*;
import examples.HelloHome;
import examples.Hello;

class HelloClientTest
{
public static void main(String[] args) throws Exception {
System.setProperty("java.security.policy","client.policy");

if(System.getSecurityManager()==null)
System.setSecurityManager(new RMISecurityManager());

Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL, "localhost:1099");
env.put(Context.URL_PKG_PREFIXES,"org.jboss.naming:org.jnp.interfaces");

Context ctx = new InitialContext(env);

Object obj = ctx.lookup("Hello");
System.out.println("2.......................................");
HelloHome home = (HelloHome) PortableRemoteObject.narrow(obj,HelloHome.class);
System.out.println("3.......................................");
Hello hello = home.create();
System.out.println(hello.hello());
hello.remove();
}
}
如果我去掉上面的System.setSecurityManager(new RMISecurityManager());
出现的错误是
[java] Exception in thread "main" java.security.AccessControlException: acc
ess denied (java.net.SocketPermission 230.0.0.4 connect,accept,resolve)
[java] at java.security.AccessControlContext.checkPermission(AccessCont
rolContext.java:323)
[java] at java.security.AccessController.checkPermission(AccessControll
er.java:546)
[java] at java.lang.SecurityManager.checkPermission(SecurityManager.jav
a:532)
[java] at java.lang.SecurityManager.checkMulticast(SecurityManager.java
:1188)
[java] at java.net.MulticastSocket.joinGroup(MulticastSocket.java:269)
[java] at org.jnp.interfaces.NamingContext.discoverServer(NamingContext
.java:1071)
[java] at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:
1199)
[java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:51
6)
[java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:50
9)
[java] at javax.naming.InitialContext.lookup(InitialContext.java:392)
[java] at HelloClientTest.main(Unknown Source)
[java] Java Result: 1
如果我加上上面的System.setSecurityManager(new RMISecurityManager())
出现的错误如下
[java] Exception in thread "main" java.security.AccessControlException: acc
ess denied (java.net.SocketPermission 230.0.0.4 connect,accept,resolve)
[java] at java.security.AccessControlContext.checkPermission(AccessCont
rolContext.java:323)
[java] at java.security.AccessController.checkPermission(AccessControll
er.java:546)
[java] at java.lang.SecurityManager.checkPermission(SecurityManager.jav
a:532)
[java] at java.lang.SecurityManager.checkMulticast(SecurityManager.java
:1188)
[java] at java.net.MulticastSocket.joinGroup(MulticastSocket.java:269)
[java] at org.jnp.interfaces.NamingContext.discoverServer(NamingContext
.java:1071)
[java] at org.jnp.interfaces.NamingContext.checkRef(NamingContext.java:
1199)
[java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:51
6)
[java] at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:50
9)
[java] at javax.naming.InitialContext.lookup(InitialContext.java:392)
[java] at HelloClientTest.main(Unknown Source)
[java] Java Result: 1
希望大家帮我看看错误原因，thanks