用Tomcat调试jsp程序出现如下：“cannot be resolved” ，请高手帮帮忙阿，急

2011-01-05 02:11:25 1.9k 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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【kubeEdge】离线部署根据k8s的这个规则，可以将节点通过 label 的方式进行分组，比如将某几个节点都打上标签为 name=edge，当调度应用到 edge 节点时，会找到 label 为 edge 的所有节点，根据设置的副本数，将应用启动起来，如果设置的副本数超过了设置 edge 标签的节点数，则多出的将会显示 pending 状态，从而无法启动。清除 keadm init 或 keadm join 造成的影响均可使用 keadm reset，这个操作会删除 /etc/kubeedge 下的文件，如有需要请提前备份。阅读详情

运行时出现下面的提示：An error occurred at line: 16 in the jsp file: /webchapter63/servlet/message.jsp
The method executeQuery(String) is undefined for the type DBconn
13: </tr>
14: <%
15: String sqli="SELECT * FROM mas ORDER BY 留言 id DESC";
16: ResultSet rs=con.executeQuery(sqli);
17: String color="";
18: String strpages=(String)request.getParameter("pages");
19: int pages=0;

An error occurred at line: 52 in the jsp file: /webchapter63/servlet/message.jsp
username cannot be resolved
49: %>
50: <tr bgcolor="<%=color%>">
51: <td align="center" width="86" height="22"><div align="left">留言人：</div></td>
52: <td align="center" width="158"><%=username%> </td>
53: <td height="22" colspan="2" align="left">留言主题;</td>
54: <td width="298" height="22" align="center"><%=topic%> </td>
55: </tr>

An error occurred at line: 54 in the jsp file: /webchapter63/servlet/message.jsp
topic cannot be resolved
51: <td align="center" width="86" height="22"><div align="left">留言人：</div></td>
52: <td align="center" width="158"><%=username%> </td>
53: <td height="22" colspan="2" align="left">留言主题;</td>
54: <td width="298" height="22" align="center"><%=topic%> </td>
55: </tr>
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期：</div></td>

An error occurred at line: 58 in the jsp file: /webchapter63/servlet/message.jsp
time cannot be resolved
55: </tr>
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期：</div></td>
58: <td width="158" height="22" align="center"><%=time%></td>
59: <td height="22" colspan="3" rowspan="3" align="left" valign="top"><%=masinfo%> </td>
60: </tr>
61: <tr bgcolor="<%=color%>">

An error occurred at line: 59 in the jsp file: /webchapter63/servlet/message.jsp
masinfo cannot be resolved
56: <tr bgcolor="<%=color%>">
57: <td width="86" height="22" align="center"><div align="left">日期：</div></td>
58: <td width="158" height="22" align="center"><%=time%></td>
59: <td height="22" colspan="3" rowspan="3" align="left" valign="top"><%=masinfo%> </td>
60: </tr>
61: <tr bgcolor="<%=color%>">
62: <td height="22" align="center"><div align="left">Email; </div></td>

An error occurred at line: 63 in the jsp file: /webchapter63/servlet/message.jsp
email cannot be resolved
60: </tr>
61: <tr bgcolor="<%=color%>">
62: <td height="22" align="center"><div align="left">Email; </div></td>
63: <td height="22" align="center"><%=email%> </td>
64: </tr>
65: <tr bgcolor="<%=color%>">
66: <td height="22" align="center"><div align="left">处理: </div></td>

An error occurred at line: 67 in the jsp file: /webchapter63/servlet/message.jsp
id cannot be resolved
64: </tr>
65: <tr bgcolor="<%=color%>">
66: <td height="22" align="center"><div align="left">处理: </div></td>
67: <td height="22" align="center"><a href="webchapter63/servlet/delMessage?id=<%=id%>">删除留言</a></td>
68: <%
69: i++;
70: if(i==sqan)break;

An error occurred at line: 71 in the jsp file: /webchapter63/servlet/message.jsp
Syntax error, insert "Finally" to complete TryStatement
68: <%
69: i++;
70: if(i==sqan)break;
71: }
72: try{
73: con.close();
74: }

An error occurred at line: 73 in the jsp file: /webchapter63/servlet/message.jsp
con cannot be resolved
70: if(i==sqan)break;
71: }
72: try{
73: con.close();
74: }
75: catch(Exception e){
76: }

An error occurred at line: 80 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
77: %>
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页  <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a>  <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>

An error occurred at line: 80 in the jsp file: /webchapter63/servlet/message.jsp
countpage cannot be resolved
77: %>
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页  <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a>  <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>

An error occurred at line: 81 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
78: </tr>
79: <tr align="right" bgcolor="#CCCCFF">
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页  <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a>  <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
84: </tr>

An error occurred at line: 83 in the jsp file: /webchapter63/servlet/message.jsp
pages cannot be resolved
80: <td height="22" colspan="5">第<%=(pages+1)%>/<%=countpage%>页  <a
81: href="message.jsp?pages=<%=(pages-1)%>">上一页
82: </a>  <a
83: href="message.jsp?pages=<%=(pages+1)%>">下一页</a></td>
84: </tr>
85: </table>
86: </body>

An error occurred at line: 181 in the generated java file
Syntax error on token "catch", Identifier expected

An error occurred at line: 183 in the generated java file
out cannot be resolved

An error occurred at line: 183 in the generated java file
_jspx_out cannot be resolved

An error occurred at line: 184 in the generated java file
out cannot be resolved

An error occurred at line: 184 in the generated java file
out cannot be resolved

An error occurred at line: 185 in the generated java file
out cannot be resolved

An error occurred at line: 186 in the generated java file
_jspx_page_context cannot be resolved

An error occurred at line: 186 in the generated java file
_jspx_page_context cannot be resolved

An error occurred at line: 188 in the generated java file
Syntax error on token "finally", { expected

An error occurred at line: 189 in the generated java file
_jspx_page_context cannot be resolved

Stacktrace:
org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:92)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:330)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:423)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:316)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:294)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:281)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:566)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:317)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)

...全文

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切换为时间正序

li_yaya 2011-04-02

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The method XXX is undefined for the type XXX 方法找不到也有可能是其他原因比如tomcat使用的不是最新编译的class文件，导致的实际类有该方法但是还是报错。所以多找找

ljy60110 2011-01-05

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为什么不把message.jsp贴出了呢看错误信息看不出多少来

ak47zhoujun 2011-01-05

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ak47zhoujun 2011-01-05

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慢慢找吧多调试调试自己找到的印象会更深刻，还能培养兴趣。
提取错误信息中的明显提示：例如：The method executeQuery(String) is undefined for the type DBconn
DBconn应该是你自己的类，而executeQuery也是你自己的方法（个人的方法网上可能找不到）：
但是The method XXX is undefined for the type XXX 这样的错误一搜就知道通常情况下是类中没有定义方法导致的。试着自己去查找错误的方法多Google

kerioz 2011-01-05

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countpage cannot be resolved
问题贴具体点
你JSP里面的那个常量<%=countpage%>这玩意儿有问题
N久没写过这种内嵌的JSP代码自己再去好好看看贴代码的时候点击工具栏的#标识
选择代码类型再把代码贴到

之间例

 

  你想要贴出的代码

零起跑线 2011-01-05

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报错在181行，但是你这根本没有181行

零起跑线 2011-01-05

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An error occurred at line: 181 in the generated java file
Syntax error on token "catch", Identifier expected
一个错误发生在181行，在生成的java文件中，缺少"catch"
An error occurred at line: 188 in the generated java file
Syntax error on token "finally", { expected
一个错误发生在188行，"finally"缺少"{"

cfq19890729 2011-01-05

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额我是初学者不怎么懂呢是照书上写的可是找了好久也没找到错这是是留言板里面的一个message.jsp
现在就这个页面出现了cannot be resolved 这个错误
我是用jsp javabean Servlet共同完成的希望有个高手能替我解决狠谢谢。。。（非常急用）

ak47zhoujun 2011-01-05

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错误信息：The method executeQuery(String) is undefined for the type DBconn
说你的DBconn没有executeQuery(String) 方法
13: </tr>
14: <%
15: String sqli="SELECT * FROM mas ORDER BY 留言 id DESC";
16: ResultSet rs=con.executeQuery(sqli);
17: String color="";
18: String strpages=(String)request.getParameter("pages");
19: int pages=0;
第16行使用con 我想这里的con 是DBcon类吧
数据库连接通常是使用Connection 创建statement或preparestatement对象使用statement和preparestatement的execute等方法生成Resultset结果集，而Connection是没有executeQuery方法的
检查下你的DBCon类吧

wjh6018 2011-01-05

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代码没有仔细看，个人觉得应该是哪个jsp哪个参数没有得到回值。

cqlfoxufo230 2011-01-05

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代码问题，好好检查一下，贴问题不用贴这么多，上面显示的大部分没用，问题很明显：cannot be resolved，感觉楼主是从那复制过来的代码

用Tomcat调试jsp程序出现如下：“cannot be resolved” ，请高手帮帮忙阿，急

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