ssh 增删改查 修改报错

Question

严重: Servlet.service() for servlet action threw exception
java.lang.ClassCastException: java.lang.Long
at com.zjy.action.UpdateAction.execute(UpdateAction.java:40)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)
2009-8-13 16:33:17 org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet action threw exception
java.lang.ClassCastException: java.lang.Long
at com.zjy.action.UpdateAction.execute(UpdateAction.java:40)
at org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:710)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:261)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:581)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Unknown Source)

Answer 1

package com.zjy.action;import java.util.List;import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;import com.zjy.bean.Customer;
import com.zjy.form.UpdateForm;
import com.zjy.service.CustomerService;
import com.zjy.util.FormBeanToVoUtil;
import com.zjy.util.WebUtil;public class UpdateAction extends Action{ @Override
public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception { UpdateForm  updateForm=(UpdateForm)form;

HttpSession session=request.getSession();

ServletContext sc=session.getServletContext();

CustomerService service=WebUtil.getCustomerService(sc);

Customer c=FormBeanToVoUtil.convertToVo(updateForm);

service.update(c); String pageId=(String)session.getAttribute("pageId");

List<Customer> page=service.getPage(Integer.parseInt(pageId));

request.setAttribute("page", page);

return mapping.findForward("page");
}
}
这是UpdateAction的代码

Answer 2

at com.zjy.action.UpdateAction.execute(UpdateAction.java:40) 40行是那一行？注红色。

Answer 3

楼主你的Bean的ID是什么类型的？请检查一下，是不是和Hibernate配置的不同，有几种类型你需要了解，JAVA类型，数据库类型和Hibaernate映射类型，一定要配置对。

Answer 4

criteria.setMaxResults(pageSize);  //40行

Answer 5

String pageId=(String)session.getAttribute("pageId");  是这个

Answer 6

List <Customer> page=service.getPage(Integer.parseInt(pageId));
有可能是这行出错
pageId可以不是数字
打应下pageId

Answer 7

List <Customer> page=service.getPage(Integer.parseInt(pageId)); 
getPage方法返回的是long类型的吧？？

Answer 8

String pageId=(String)session.getAttribute("pageId");   第40行代码 

Answer 9

List <Customer> page=service.getPage(Integer.parseInt(pageId)); 错了，Long.parseLong()

Answer 10

List <Customer> page=service.getPage(Integer.parseInt(pageId));
LZ 查看一下service.getPage（）传入的参数是int形的吗

Answer 11

类转换异常应该是form类和vo类没进行转换就存到request里了

Answer 12

java.lang.ClassCastException: java.lang.Long
at com.zjy.action.UpdateAction.execute(UpdateAction.java:40)  
类型转换异常 也就是 类型不匹配。 调试看看 哪个属性跟数据库不一样啊。

Answer 13

id可能是long型的吧,
你转换一下