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论坛首页 › 隐藏归类 › 黑马那些年 › 第14届Android交流区 › 正文

这个异常是怎么回事

© 尤圣回 中级黑马   /  2012-9-17 13:18  /  1765 人查看  /  1 人回复  /   0 人收藏 转载请遵从CC协议 禁止商业使用本文

  1. type Exception report

  3. message javax.el.ELException: Cannot convert 1 of type class java.lang.String to class java.lang.Integer

  5. description The server encountered an internal error (javax.el.ELException: Cannot convert 1 of type class java.lang.String to class java.lang.Integer) that prevented it from fulfilling this request.

  7. exception

  9. org.apache.jasper.JasperException: javax.el.ELException: Cannot convert 1  of type class java.lang.String to class java.lang.Integer
  10.         org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
  11.         org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:470)
  12.         org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
  13.         org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
  14.         javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
  15.         org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
  16.         org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
  17.         org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
  18.         org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
  19.         org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
  20.         javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  21.         javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


  24. root cause

  26. javax.el.ELException: Cannot convert 1  of type class java.lang.String to class java.lang.Integer
  27.         org.apache.el.lang.ELSupport.coerceToNumber(ELSupport.java:312)
  28.         org.apache.el.lang.ELSupport.coerceToNumber(ELSupport.java:283)
  29.         org.apache.el.lang.ELSupport.coerceToType(ELSupport.java:396)
  30.         org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:191)
  31.         org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:985)
  32.         org.apache.jsp.WEB_002dINF.page.product.producttypelist_jsp._jspx_meth_c_005fforEach_005f0(producttypelist_jsp.java:174)
  33.         org.apache.jsp.WEB_002dINF.page.product.producttypelist_jsp._jspService(producttypelist_jsp.java:113)
  34.         org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
  35.         javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
  36.         org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
  37.         org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
  38.         org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
  39.         javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
  40.         org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1078)
  41.         org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProcessor.java:396)
  42.         org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
  43.         org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
  44.         org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:449)
  45.         javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
  46.         javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
  47. 这个是页面
  48. [code]<%@ page contentType="text/html;charset=UTF-8" %>
  49. <%@ include file="/WEB-INF/page/share/taglib.jsp" %>
  50. <html>
  51. <head>
  52. <title>产品类别管理</title>
  53. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  54. <link rel="stylesheet" href="/css/vip.css" type="text/css">
  55. <script language="JavaScript">
  56. <!--

  58. //-->
  59. </script>
  60. <SCRIPT language=JavaScript src="/js/FoshanRen.js"></SCRIPT>
  61. </head>

  63. <body bgcolor="#FFFFFF" text="#000000" marginwidth="0" marginheight="0">


  66.   <table width="98%" border="0" cellspacing="1" cellpadding="2" align="center">
  67.     <tr ><td colspan="6"  bgcolor="6f8ac4" align="right">
  68.    总记录数:${pageView.totalrecord } |每页显示数:${pageView.totalrecord }条 |总页数:${pageView.totalpage }
  69.     <c:forEach begin="${pageView.pageindex.startindex} " end="${pageView.pageindex.endindex }" var="wp">
  70.     <c:if test="${pageView.currentpage==wp }"><b> 第${wp }页</b></c:if>
  71.     <c:if test="${pageView.currentpage!=wp }"> <a href='<html:rewrite action="/control/production/type/list"/>?page=${wp}' class="a03">  第${wp }页</a></c:if>

  73.     </c:forEach>       
  74.    </td></tr>
  75.     <tr>
  76.       <td width="8%" bgcolor="6f8ac4"> <div align="center"><font color="#FFFFFF">代号</font></div></td>
  77.       <td width="5%" nowrap bgcolor="6f8ac4"> <div align="center"><font color="#FFFFFF">修改</font></div></td>
  78.       <td width="20%" bgcolor="6f8ac4"> <div align="center"><font color="#FFFFFF">产品类别名称</font></div></td>
  79.           <td width="10%" nowrap bgcolor="6f8ac4"> <div align="center"><font color="#FFFFFF">创建下级类别</font></div></td>
  80.           <td width="15%" bgcolor="6f8ac4"><div align="center"><font color="#FFFFFF">所属父类</font></div></td>
  81.           <td nowrap bgcolor="6f8ac4"> <div align="center"><font color="#FFFFFF">备注</font></div></td>
  82.     </tr>
  83. <!---------------------------LOOP START------------------------------>
  84. <c:forEach items="${pageView.records }" var="productType">
  85.     <tr>
  86.       <td bgcolor="f5f5f5"> <div align="center">${productType.typeid }</div></td>
  87.       <td bgcolor="f5f5f5"> <div align="center">
  88.           <img src="images/edit.gif" width="15" height="16" border="0"></a></div></td>
  89.       <td bgcolor="f5f5f5"> <div align="center"><a href="">${productType.typename }</a></div></td>
  90.           <td bgcolor="f5f5f5"> <div align="center"><a href="">创建子类别</a></div></td>
  91.           <td bgcolor="f5f5f5" align="center"><c:if test="${!empty productType.parent }">${productType.parent.name }</c:if></td>
  92.           <td bgcolor="f5f5f5">${productType.note }</td>
  93.         </tr>
  94. </c:forEach>
  95.     <!----------------------LOOP END------------------------------->
  96.     <tr>
  97.       <td bgcolor="f5f5f5" colspan="6" align="center"><table width="100%" border="0" cellspacing="1" cellpadding="3">
  98.           <tr>
  99.             <td width="5%"></td>
  100.               <td width="85%">
  101.               <input name="AddDic" type="button" class="frm_btn" id="AddDic" onClick="javascript:window.location.href='<html:rewrite action="/control/product/type/manage"/>?method=addUI&parentid=${param.parentid}'" value="添加类别"> &nbsp;&nbsp;
  102.                           <input name="query" type="button" class="frm_btn" id="query" onClick="javascript:window.location.href='<html:rewrite action="/control/product/type/manage"/>?method=queryUI'" value=" 查 询 "> &nbsp;&nbsp;
  103.             </td>
  104.           </tr>
  105.         </table></td>
  106.     </tr>
  107.   </table>
  108. </body>
  109. </html>
复制代码
[/code]
  1. package cn.mu.web.action.product;
  2. 这个是sturts1.3的action代码 其他模块测试正常
  3. import java.util.LinkedHashMap;

  5. import javax.annotation.Resource;
  6. import javax.servlet.http.HttpServletRequest;
  7. import javax.servlet.http.HttpServletResponse;

  9. import org.apache.struts.action.Action;
  10. import org.apache.struts.action.ActionForm;
  11. import org.apache.struts.action.ActionForward;
  12. import org.apache.struts.action.ActionMapping;
  13. import org.springframework.stereotype.Controller;

  15. import cn.mu.bean.PageIndex;
  16. import cn.mu.bean.PageView;
  17. import cn.mu.bean.QueryResult;
  18. import cn.mu.bean.WebTool;
  19. import cn.mu.bean.product.ProductType;
  20. import cn.mu.service.product.ProductTypeService;
  21. import cn.mu.web.formbean.product.ProductTypeForm;

  23. @Controller("/control/product/type/list")
  24. public class ProductTypeAction extends Action {
  25.         @Resource(name="productTypeServiceBean")
  26.         private ProductTypeService productTypeService;
  27.        
  28.         @Override
  29.         public ActionForward execute(ActionMapping mapping, ActionForm form,
  30.                         HttpServletRequest request, HttpServletResponse response)
  31.                         throws Exception {
  32.                 ProductTypeForm formbean=(ProductTypeForm)form;
  33.                 PageView<ProductType> pageView=new PageView<ProductType>(12, formbean.getPage());
  34.                
  35.                 int firstindex=(pageView.getCurrentpage()-1)*pageView.getMaxresult();
  36.                 LinkedHashMap<String, String>orderby=new LinkedHashMap<String,String>();
  37.                 orderby.put("typeid", "desc");
  38.                 QueryResult<ProductType>qr=productTypeService.getScrollData(ProductType.class, firstindex, pageView.getMaxresult(), "o.visible=?1", new Object[]{true}, orderby);
  39.           
  40.                 pageView.setQueryResult(qr);
  41.                
  42.                
  43.                 request.setAttribute("pageView",pageView);
  44.                
  45.                 return mapping.findForward("list");
  46.         }

  48.        
  49. }
复制代码

1 个回复

倒序浏览
寇龙飞 中级黑马 2012-9-17 13:58:11
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沙发
Cannot convert 1 of type class java.lang.String to class java.lang.Integer
类型转化错误，无法从String类型转到Integer！
有出错位置提示的，你点开每条去排查。

如果不行，把你的项目打包上传来看下。

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