将Hibernate配置到Weblogic JNDI上的问题（尤其请robbin指教）

package com.fankai;

import java.util.Hashtable;
import weblogic.common.T3StartupDef;
import weblogic.common.T3ServicesDef;
import net.sf.hibernate.cfg.Configuration;
import net.sf.hibernate.SessionFactory;

public class WLSStartup implements T3StartupDef {

public void setServices(T3ServicesDef services) {}

public String startup(String name, Hashtable args) throws Exception {
Configuration conf = new Configuration().addClass(Cat.class);
SessionFactory sf = conf.buildSessionFactory();
return "Hibernate Startup completed successfully";
}
}

我编译的时候， Configuration conf = new Configuration().addClass(Cat.class);
出错，信息为："WLSStartup.java": cannot resolve symbol: class Cat in class com.fankai.WLSStartup at line 44, column 57
请问怎么解决呀？？？