code: @Override
  	public String getClientID() throws JMSException
      {
      	externalAccessLock.readLock().lock();
      	try
  		{
  	        if (clientID == null)
  	            throw new InvalidClientIDException("Client ID not set");
  	        return clientID;
  		}
      	finally
      	{
      		externalAccessLock.readLock().unlock();
      	}
      }
docs: /* (non-Javadoc)
  @see javax.jms.Connection#getClientID()