求救!!!我快疯了java.lang.ClassCastException错误

Question

你这个好像是cglib自动生成的吧

Answer 1

ClassCastException这个异常一般是强制类型转换错误，不能强制转的时候你转了

Answer 2

t com.guandong.oa.manager.impl.PersonManagerImpl.addPerson(PersonManagerImpl.java:16) 
看看这行
ClassCastException是类型转换出了问题

Answer 3

把com.guandong.oa.manager.impl.PersonManagerImpl.java这个程序放上来看看撒。

Answer 4

如果你的com.guandong.oa.model.Person是用ejb3写的或hibernate 3.0 使用复合主键。就一定要实现serializable接口。否则就会出现：java.lang.ClassCastException错误～

Answer 5

java.lang.ClassCastException: com.guandong.oa.model.Person$$EnhancerByCGLIB$$d70c6a32 
看上去是对象转换异常，楼主把从DAO里面取出来的数据放到List或者取出的时候的那段代码贴出来，否则怎么看？

Answer 6

对不起这两天去面试了,没上线,我现在把代码贴出来,可能有点多因为不知道那出错了
package com.guandong.oa.manager.impl;import com.guandong.oa.PagerModel;
import com.guandong.oa.SystemException;
import com.guandong.oa.manager.PersonManager;
import com.guandong.oa.model.Orgnization;
import com.guandong.oa.model.Person;public class PersonManagerImpl extends AbstractManager implements PersonManager { public void addPerson(Person person, int orgId) {
        if(orgId == 0){
         throw new SystemException("机构不允许为空!");
        }
        person.setOrg(
         (Orgnization)getHibernateTemplate().load(Person.class,orgId)
         );
        
        getHibernateTemplate().save(person);
} public void delPerson(int personId) {
getHibernateTemplate().delete(
getHibernateTemplate().load(Person.class, personId)
);
} public Person findPerson(int personId) {

return (Person)getHibernateTemplate().load(Person.class, personId);
} public PagerModel searchPersons() {

return serachPaginated("from Person");
} public PagerModel searchPersons(int orgId) {

return serachPaginated("select p from Person p where p.org.id = "+orgId);
}}

Answer 7

package com.guandong.oa.manager.impl;import com.guandong.oa.PagerModel;
import com.guandong.oa.SystemException;
import com.guandong.oa.manager.OrgManager;
import com.guandong.oa.model.Orgnization;
public class OrgManagerImpl extends AbstractManager implements OrgManager { public void addOrg(Orgnization org, int parentId) {
if (parentId != 0) {
org.setParent((Orgnization) getHibernateTemplate().load(
Orgnization.class, parentId));
}
getHibernateTemplate().save(org);
org.setSn(org.getParent() == null ? ("" + org.getId()) : (org
.getParent().getSn()
+ "_" + org.getId()));
getHibernateTemplate().update(org);
} public void delOrg(int orgId) {
Orgnization org = (Orgnization) getHibernateTemplate().load(
Orgnization.class, orgId);
if (org.getChildren().size() > 0) {
throw new SystemException("存在子机构不能删除!", "exception.org.del", org
.getId());
}
getHibernateTemplate().delete(org); } public Orgnization findOrg(int orgId) {
return (Orgnization) getHibernateTemplate().load(Orgnization.class,
orgId);
} public void update(Orgnization org, int parentId) {
if (parentId != 0) {
org.setParent((Orgnization) getHibernateTemplate().load(
Orgnization.class, parentId));
}
getHibernateTemplate().update(org);
} public PagerModel findOrgs(int parentId) {
/*String selectCountHql = "select count(*) from Orgnization o where o.parent.id is null"; if (parentid != 0) {
selectCountHql = "select count(*) from Orgnization o where o.parent.id ="
+ parentid;
} // 获取总记录数
int total = ((Long) getSession().createQuery(selectCountHql)
.uniqueResult()).intValue(); String selectHql = "select o from Orgnization o where o.parent.id is null"; if (parentid != 0) {
selectHql = "select o from Orgnization o where o.parent.id ="
+ parentid;
} //获取当前页的数据
List datas = getSession().createQuery(selectHql)
 .setFirstResult(offset)
 .setMaxResults(pagesize)
 .list();
PagerModel pm = new PagerModel();

pm.setTotal(total);

pm.setDatas(datas);

return pm;*/ if(parentId==0){
 return serachPaginated("from Orgnization o where o.parent.id is null");
 }
 return serachPaginated("from Orgnization o where o.parent.id = ?",parentId);
}}
web.xml:<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
xmlns="http://java.sun.com/xml/ns/j2ee" 
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <!-- Standard Action Servlet Configuration (with debugging) -->
  <servlet>
    <servlet-name>action</servlet-name>
    <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
    <init-param>
      <param-name>config</param-name>
      <param-value>/WEB-INF/struts-config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>2</param-value>
    </init-param>
    <init-param>
      <param-name>detail</param-name>
      <param-value>2</param-value>
    </init-param>
    <load-on-startup>2</load-on-startup>
  </servlet>  <!-- Standard Action Servlet Mapping -->
  <servlet-mapping>
    <servlet-name>action</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>  <context-param>
     <param-name>contextConfigLocation</param-name>
     <param-value>/WEB-INF/applicationContext-*.xml,classpath*:applicationContext-*.xml</param-value>
  </context-param>
  
  <listener>
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <filter>
    <filter-name>hibernateFilter</filter-name>
    <filter-class>org.springframework.orm.hibernate3.support.OpenSessionInViewFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>hibernateFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping> 
  
<filter>
    <filter-name>Spring character encoding filter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
     <param-name>encoding</param-name>
     <param-value>GBK</param-value>
    </init-param>
  </filter>
 <filter-mapping>
    <filter-name>Spring character encoding filter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
<filter>
    <filter-name>pagerFilter</filter-name>
    <filter-class>com.gudong.oa.web.PagerFilter</filter-class>
  </filter>
 <filter-mapping>
    <filter-name>pagerFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
</web-app>

Answer 8

struts-config.xml:
<?xml version="1.0" encoding="ISO-8859-1" ?><!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
<form-beans>
<form-bean name="orgForm" type="com.gudong.oa.web.forms.OrgActionForm"></form-bean>
<form-bean name="personForm" type="com.gudong.oa.web.forms.PersonActionForm"></form-bean>
</form-beans>
<global-exceptions>
<exception key="errors.detail" 
type="com.guandong.oa.SystemException" 
scope="request" path="/common/exception.jsp" 
handler="com.gudong.oa.web.SystemExceptionHandler"></exception>
</global-exceptions>
<global-forwards>
<forward name="pub_add_success" path="/common/pub_add_success.jsp"></forward>
<forward name="pub_del_success" path="/common/pub_del_success.jsp"></forward>
<forward name="pub_update_success" path="/common/pub_update_success.jsp"></forward>
    </global-forwards>
<action-mappings>
<action path="/org"
type="org.springframework.web.struts.DelegatingActionProxy"
name="orgForm"
scope="request"
parameter="method"

>
     
<!--<exception key="errors.detail" type="com.guandong.oa.SystemException" scope="request" path="/common/exception.jsp"></exception>
--><!--<forward name="exception" path="/common/exception.jsp"></forward>
--><forward name="index" path="/org/index.jsp"></forward>
<forward name="add_input" path="/org/add_input.jsp"></forward>
<forward name="select" path="/org/select.jsp"></forward>
</action>
<action path="/person"
type="org.springframework.web.struts.DelegatingActionProxy"
name="personForm"
scope="request"
parameter="method"

>
<forward name="index" path="/person/index.jsp"></forward>
<forward name="add_Input" path="/person/add_input.jsp"></forward>
</action>
</action-mappings>
    <message-resources parameter="MessageResources" />
</struts-config>package com.gudong.oa.web.action;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;import com.guandong.oa.manager.OrgManager;
import com.guandong.oa.model.Orgnization;
import com.gudong.oa.web.forms.OrgActionForm;public class OrgAction extends DispatchAction {
private OrgManager orgManager; @Override
protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
OrgActionForm oaf = (OrgActionForm) form;

request.setAttribute("pm", orgManager.findOrgs(oaf.getParentId())); int ppid = 0; if (oaf.getParentId() != 0) { Orgnization org = (Orgnization) orgManager.findOrg(oaf.getParentId()); Orgnization parent = org.getParent(); if (parent != null) { ppid = parent.getId(); }

}
request.setAttribute("ppid", ppid); if(oaf.isSelect()){
return mapping.findForward("select");
}

return mapping.findForward("index");
} public ActionForward add_input(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
return mapping.findForward("add_input");
} public ActionForward add(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
OrgActionForm oaf = (OrgActionForm) form; Orgnization org = new Orgnization(); BeanUtils.copyProperties(org, oaf); orgManager.addOrg(org, oaf.getParentId()); return mapping.findForward("pub_add_success");
} public ActionForward del(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
OrgActionForm oaf = (OrgActionForm) form; orgManager.delOrg(oaf.getId()); // 异常方法二
// 
// try {
// 手功异常
// orgManager.delOrg(oaf.getId());
// } catch (Exception e) {
// ActionMessages msgs = new ActionMessages();
//
// ActionMessage msg = new ActionMessage("errors.detail",
// e.getMessage());
//
// msgs.add("detail", msg);
//
// this.saveErrors(request, msgs);
//
// return mapping.findForward("exception");
// } return mapping.findForward("pub_del_success");
} public void setOrgManager(OrgManager orgManager) {
this.orgManager = orgManager;
}}package com.gudong.oa.web.action;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.commons.beanutils.BeanUtils;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.actions.DispatchAction;import com.guandong.oa.manager.PersonManager;
import com.guandong.oa.model.Person;
import com.gudong.oa.web.forms.PersonActionForm;public class PersonAction extends DispatchAction { private PersonManager personManager; protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { request.setAttribute("pm", personManager.searchPersons()); return mapping.findForward("index");
} // 打开添加页面
public ActionForward addInput(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { return mapping.findForward("add_Input");
}

//添加人员
public ActionForward add(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { PersonActionForm paf = (PersonActionForm)form; Person person = new Person(); BeanUtils.copyProperties(person, paf); personManager.addPerson(person,paf.getOrgId());

return mapping.findForward("pub_add_success");
} //删除人员
public ActionForward del(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { PersonActionForm paf = (PersonActionForm)form; personManager.delPerson(paf.getId()); return mapping.findForward("pub_del_success");
} public void setPersonManager(PersonManager personManager) {
this.personManager = personManager;
}}

Answer 9

(Orgnization)getHibernateTemplate().load(Person.class,orgId) 看看类型转换是否正确