JMS接入websphere MQ 出现错误，高手赐教

JMS接入websphere MQ 出现异常，高手赐教
JMS 接口接入Websphere MQ 出现以下异常：

Exception in thread "main" javax.naming.NoInitialContextException: Cannot instantiate class: com.sun.jndi.fscontext.RefFSContextFactory [Root exception is java.lang.ClassNotFoundException: com.sun.jndi.fscontext.RefFSContextFactory]
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:657)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.InitialContext.<init>(InitialContext.java:197)
at devx.articles.mqjms.JNDIUtil.<init>(JNDIUtil.java:32)
at devx.articles.mqjms.Tester.main(Tester.java:47)
Caused by: java.lang.ClassNotFoundException: com.sun.jndi.fscontext.RefFSContextFactory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at com.sun.naming.internal.VersionHelper12.loadClass(VersionHelper12.java:46)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:654)
... 5 more


以下为代码：
package devx.articles.mqjms;

// JMS classes
import javax.jms.JMSException;
import javax.jms.Queue;
import javax.jms.QueueConnectionFactory;

// JNDI classes
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;

// Standard Java classes
import java.util.Hashtable;

/**
 * 
 * A wrapper class for JNDI calls
 *
 */
public class JNDIUtil
{
private Context context;

public JNDIUtil(String icf, String url) throws JMSException, NamingException
{
Hashtable environment = new Hashtable();

environment.put(Context.INITIAL_CONTEXT_FACTORY, icf );
environment.put(Context.PROVIDER_URL, url);

  context= new InitialContext( environment );

}

/**
* 
* @param ObjName Object Name to be retrieved
* @return Retrieved Object
* @throws NamingException
*/
private Object getObjectByName(String ObjName) throws NamingException
{
return context.lookup( ObjName );
}

/**
* A convenience method that returns QueueConnectionFactory objects (no casting required)
* @param factoryName QueueConnectionFactory JNDI name
* @return QueueConnectionFactory object
* @throws NamingException
*/
public QueueConnectionFactory getQueueConnectionFactory(String factoryName) throws NamingException
{
return (QueueConnectionFactory) getObjectByName(factoryName);
}

/**
* A convenience method that returns Queue objects (no casting required) 
* @param queueName
* @return
* @throws NamingException
*/
public Queue getQueue(String queueName) throws NamingException
{
return (Queue) getObjectByName(queueName);
}

}


--------------------------
package devx.articles.mqjms;

//JMS classes
import javax.jms.Queue;
import javax.jms.QueueSession;
import javax.jms.QueueConnection;
import javax.jms.QueueConnectionFactory;
import javax.jms.JMSException;
import javax.jms.Session;
import javax.jms.QueueSender;
import javax.jms.QueueReceiver;
import javax.jms.TextMessage;
import javax.jms.Message;

//JNDI classes
import javax.naming.NamingException;

//Standard Java classes