初学j2ee的人都会遇到这样的问题，您是如何解决的呢？

<script type="text/javascript">google_ad_client = "pub-8800625213955058";/* 336x280, 创建于 07-11-21 */google_ad_slot = "0989131976";google_ad_width = 336;google_ad_height = 280;//</script><script type="text/javascript"src="http://pagead2.googlesyndication.com/pagead/show_ads.js"></script>//本地接口package securitybeans;import java.rmi.RemoteException;import javax.ejb.EJBHome;import javax.ejb.CreateException;public interface SecurityHome extends EJBHome{Security create() throws CreateException, RemoteException;}编译后出的错误信息如下：SecurityHome.java:6cannot resolve symbolsymbol :class Securitylocation : interface securitybeans.SecurityHomeSecurity create()throws CreateException, RomoteException;^1 error//Security是远程接口，已编译生成了Security.class文件，并和Security.java在同一目录下Security.java源代码如下：package securitybeans;import java.rmi.RemoteException;import javax.ejb.EJBObject;public interface Security extends EJBObject{public String encrypt( String strSource ) throws RemoteException;public String decrypt( String strTarget ) throws RemoteException;}//我该如何解决此问题