BeanUtils.copyProperties使用中各种出错，求大神指导~~

[RainyNight_WC]

com.bdyc.manager.pojo包中的Employee

package com.bdyc.manager.pojo;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
public class Employee implements java.io.Serializable {
	private int eid;
	private Role role;
	private String ename;
	private String epwd;
	private String esex;
	private int eage;
	private String ephone;
	private Date ehiredate;
	private String eidcard;
	private int estatus;
	private String ejob;
	private String etips;
	private Set<Items> itemses = new HashSet<Items>();
	private Set<Access> accesses = new HashSet<Access>();
	private Set<Info> infosForEid = new HashSet<Info>();
	private Set<Info> infosForEmpEid = new HashSet<Info>();
	private Set<Task> tasks = new HashSet<Task>();
        //有参构造与无参构造
	//所有的set和get
}

com.bdyc.manager.bean包中的Employee

package com.bdyc.manager.bean;
import java.util.Date;
import java.util.HashSet;
import java.util.Set;
public class Employee {
	private int eid;
	private Role role;
	private String ename;
	private String epwd;
	private String esex;
	private int eage;
	private String ephone;
	private Date ehiredate;
	private String eidcard;
	private int estatus;
	private String ejob;
	private String etips;
	private Set<Items> itemses = new HashSet<Items>();
	private Set<Access> accesses = new HashSet<Access>();
	private Set<Info> infosForEid = new HashSet<Info>();
	private Set<Info> infosForEmpEid = new HashSet<Info>();
	private Set<Task> tasks = new HashSet<Task>();
        //有参构造与无参构造
	//所有的set和get
}

Employee的Service

package com.bdyc.manager.service;
import java.lang.reflect.InvocationTargetException;
import org.apache.commons.beanutils.BeanUtils;
import com.bdyc.manager.bean.Employee;
import com.bdyc.manager.dao.EmployeeDao;
public class EmployeeService {
	public Employee Login(String ename, String epwd) {
		EmployeeDao ed = new EmployeeDao();//dao类，用于连接数据库和增删改查
		com.bdyc.manager.pojo.Employee ee = ed.get(ename, epwd);//查询，返回的是com.bdyc.manager.pojo包下的Employee
		Employee emp = new Employee();
		if (ee != null) {
			try {
				BeanUtils.copyProperties(emp, ee);
			} catch (IllegalAccessException e) {
				e.printStackTrace();
			} catch (InvocationTargetException e) {
				e.printStackTrace();
			}
		}
		return emp;
	}
}

错误信息是

2016-8-26 0:01:24 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [LoginServlet] in context with path [/itemmanager] threw exception
java.lang.IllegalArgumentException: Cannot invoke com.bdyc.manager.bean.Employee.setRole on bean class 'class com.bdyc.manager.bean.Employee' - argument type mismatch - had objects of type "com.bdyc.manager.pojo.Role" but expected signature "com.bdyc.manager.bean.Role"
	at org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:2235)
	at org.apache.commons.beanutils.PropertyUtilsBean.setSimpleProperty(PropertyUtilsBean.java:2151)
	at org.apache.commons.beanutils.BeanUtilsBean.copyProperty(BeanUtilsBean.java:439)
	at org.apache.commons.beanutils.BeanUtilsBean.copyProperties(BeanUtilsBean.java:286)
	at org.apache.commons.beanutils.BeanUtils.copyProperties(BeanUtils.java:137)
	at com.bdyc.manager.service.EmployeeService.Login(EmployeeService.java:18)
	at com.bdyc.manager.servlet.LoginServlet.doGet(LoginServlet.java:21)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
	at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
	at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2517)
	at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2506)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
	at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at org.apache.commons.beanutils.PropertyUtilsBean.invokeMethod(PropertyUtilsBean.java:2170)
	... 26 more

有关BeanUtils.copyProperties的资料我百度谷歌了一天了，重写过好几种方法，都报错，有时候是类中的类没办法复制，有时侯是java.util.Date无法复制(使用Hibernate链接MySQL的时候java.sql.Date使用不成功)，还有时候没有catch到错误，但是return的emp是个空值........
已经无奈了，求大神帮忙看一下是哪里出错了~~~