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

Answer 1

楼主自己用debug调试一下就会定位异常了啊！类型转换异常啊！

Answer 2

恩 第一次用debug 我更新的时候，错误，有跑到debug模式下，但不知道怎么跟踪

Answer 3

com.zjy.action.UpdateAction的第四十行，转换 Long 出现异常估计是这个值是null，所以才会出现转换问题

Answer 4

java.lang.ClassCastException: java.lang.Long 类型转换异常：你在类型转换的时候报错了。
你好好看看UpdateAction里面 你在设置值的时候或是在获得值的时候是不是类型转换有问题。