如何从容器外部访问Websphere 7.0中定义的JNDI名称空间？

(RMI客户端)Test.jar的Java代码：

public static void main(String[] args){
Hashtable<Object,Object> properties = new Hashtable<Object,Object>();
properties.put(Context.INITIAL_CONTEXT_FACTORY,"com.ibm.websphere.naming.WsnInitialContextFactory"); 
           properties.put(Context.PROVIDER_URL,"iiop://localhost:2809"); 
InitialContext intCt;
try {
       InitialContext initCtx = new InitialContext(properties);
       Object obj = intCt.lookup(JNDI_NAME);
     }catch (NamingException namingE) {
            System.out.println("Naming Exception occurred :");
            namingE.printStackTrace();
        }   
}

要调用Test.jar的Cmmand文件：

set appClassPath=C:WebSphereAppServer7.0deploytoolitppluginscom.ibm.websphere.v7_7.0.1.v20090422_1423wasJarsnaming.jar;C:WebSphereAppServer7.0deploytoolitppluginscom.ibm.websphere.v7_7.0.1.v20090422_1423wasJarsnamingclient.jar;C:WebSphereAppServer7.0properties;C:BatchCommandFilesJobServerTest.jar

C:WebSphereAppServer7.0javajrebinjava -jar -cp "%appClassPath%" C:BatchCommandFilesJobServerTest.jar %Parameters%  

注意：请注意,我在本地machin和bootstrap主机上运行客户端是：localhost,端口是2809.

在运行Test.jar代码形式命令文件时,我收到以下错误：

javax.naming.NoInitialContextException: Failed to create InitialContext using factory specified in hashtable {java.naming.provider.url=iiop://localhost:2809,java.naming.factory.initial=com.ibm.websphere.naming.WsnInitialContextFactory} [Root exception is java.lang.NullPointerException]
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:243)
    at javax.naming.InitialContext.initializeDefaultInitCtx(InitialContext.java:327)
    at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:357)
    at javax.naming.InitialContext.internalInit(InitialContext.java:295)
    at javax.naming.InitialContext.(InitialContext.java:212)
    at com.uuic.ets.rmi.server.client.Client.main(Client.java:130)
Caused by: java.lang.NullPointerException
    at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:235)
    ... 5 more

我不知道为什么这段代码无法实例化InitialContext(Hashmap env).此相同的代码在Websphere应用程序服务器版本5.1中运行,但在Websphere应用程序服务器版本7.0中存在问题.