Java 异常的根本原因是什么；org.apache.jasper.runtime.PageContextImpl.handlePageException“是吗？”；？
异常日志Java 异常的根本原因是什么；org.apache.jasper.runtime.PageContextImpl.handlePageException“是吗？”；？,java,jsp,exception-handling,Java,Jsp,Exception Handling,异常日志 javax.servlet.ServletException at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536) at org.apache.jsp.FileUploadFormatAdd_jsp._jspService(FileUploadFormatAdd_jsp.java:620) at org.apache.jasper.runtime.HttpJ
javax.servlet.ServletException
at org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:536)
at org.apache.jsp.FileUploadFormatAdd_jsp._jspService(FileUploadFormatAdd_jsp.java:620)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:210)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:295)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
</HEAD>
<BODY leftmargin="0" topmargin="0" marginheight="0" marginwidth="0" bgcolor="#ffffff" onLoad="document.FileUploadFormatAdd.reqdFileFormatName.focus();">
<FORM method=post name="FileUploadFormatAdd" action="FileUploadFormatAdd.jsp" onSubmit="return validate(this);" >
--%>
文件格式名
字段名
最小长度
最大长度
类型
允许将来的日期吗
允许过期吗
是必填字段
取决于字段名
取决于字段值（逗号分隔的值）
最小值
最大值
现场秩序
Sql查询
挑选
密码
CodeNoSQl
日期（年月日）
电子邮件
浮动
数
正文
在“javax.servlet.ServletException”后面什么都没有？服务器日志文件中有其他信息吗 第一个非常可疑的地方是代码的这一部分，删除了HTML位
Iterator iterFieldValues=listOfFields.iterator();
for (int i=0;i<noOfRows;i++){
String fieldName=(String)iterFieldValues.next();
String minLength=(String)iterFieldValues.next();
String maxLength=(String)iterFieldValues.next();
String fieldType=(String)iterFieldValues.next();
...
}
Iterator iterFieldValues=listofelds.Iterator（）；
for（inti=0；i+1）用于实际阅读和理解这一混乱局面。当我开始我当前的项目时，OP中的大多数JSP看起来都像这样；（与我正在处理的许多项目相比，上面的代码实际上非常干净易读；-）
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="1%" valign="top">
<%-- Modified by Jasleen
<!-- Left Menu Start -->
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td bgcolor="#dddddd" width="1%"><img src="images/transp.gif" height="1" width="160"></td>
</tr>
<tr>
<td width="1%">
<!-- Start of Header Menu -->
<!-- End of Header Menu -->
</td>
</tr>
</table>
<!-- Left Menu End -->
--%>
</td>
<td width="1%" valign="top">
<!-- Spacer (Left Menu and Main) Start -->
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td width="1%"><img src="images/transp.gif" height="1" width="20"></td>
</tr>
</table>
</td>
<td width="99%" valign="top">
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr>
<td class="pageheader">
</td>
</tr>
</table>
<hr color="#cccccc" size="0" noshade width="99%" align="center">
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<td>
FileFormatName
<input type="text" name="reqdFileFormatName">
</td>
</table>
<table border="0" width="100%" cellspacing="0" cellpadding="0">
<tr>
<td>Field Name</td>
<td>Min Length</td>
<td>Max Length</td>
<td>Type</td>
<td>Is Future Date Allowed</td>
<td>Is Past Date Allowed</td>
<td>Is Required Field</td>
<td>Depends Upon Field Name</td>
<td>Depends Upon Field Value(Comma Separated Values)</td>
<td>Min Value</td>
<td>Max Value</td>
<td>Field Order</td>
<td>Sql Query</td>
</tr>
<input type="hidden" name="noOfRows" value="<%=noOfRows%>">
<%
Iterator iterFieldValues=listOfFields.iterator();
%>
<%for (int i=0;i<noOfRows;i++){%>
<tr>
<%
String fieldName=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="reqdFieldName"+i%>" value="<%=(fieldName!=null)?fieldName:""%>" size="20" MAXLENGTH="100">
</td>
<%
String minLength=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="minLength"+i%>" value="<%=(minLength!=null)?minLength:""%>" size="10" MAXLENGTH="5">
</td>
<%
String maxLength=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="maxLength"+i%>" value="<%=(maxLength!=null)?maxLength:""%>" size="10" MAXLENGTH="5">
</td>
<%
String fieldType=(String)iterFieldValues.next();
%>
<td>
<select name="<%="reqdType"+i%>" size="20" onchange='EnableFields(this.name)'>
<option value="">Select<option>
<option value="CodeNo" <%=fieldType.equals("CodeNo")?"selected":"" %> >CodeNo</option>
<option value="CodeNoSQl" <%=fieldType.equals("CodeNo")?"selected":"" %>>CodeNoSQl</option>
<option value="Date(dd/mm/yyyy)" <%=fieldType.equals("Date(dd/mm/yyyy)")?"selected":"" %>>Date(dd/mm/yyyy)</option>
<option value="Email" <%=fieldType.equals("Email")?"selected":"" %>>Email</option>
<option value="Float" <%=fieldType.equals("Float")?"selected":"" %>>Float</option>
<option value="Number" <%=fieldType.equals("Number")?"selected":"" %>>Number<option>
<option value="Text" <%=fieldType.equals("Text")?"selected":"" %>>Text<option>
</select>
</td>
<%
String isFutureDateAllowedValue=(String)iterFieldValues.next();
%>
<td>
<input type="checkBox" value="1" name="<%="isFutureDateAllowed"+i%>" <%=isFutureDateAllowedValue.equals("1")?"checked":""%> disabled >
</td>
<%
String isPastDateAllowedValue=(String)iterFieldValues.next();
%>
<td>
<input type="checkBox" value="1" name="<%="isPastDateAllowed"+i%>" <%=isPastDateAllowedValue.equals("1")?"checked":""%> disabled >
</td>
<%
String isReqdFieldValue=(String)iterFieldValues.next();
%>
<td>
<input type="checkBox" value="1" name="<%="isReqdField"+i%>" <%=isReqdFieldValue.equals("1")?"checked":""%> >
</td>
<%
String dependsUponFieldName=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="dependsUponFieldName"+i%>" value="<%=(dependsUponFieldName!=null)?dependsUponFieldName:""%>" size="20" MAXLENGTH="100">
</td>
<%
String dependsUponFieldValue=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="dependsUponFieldValue"+i%>" value="<%=(dependsUponFieldValue!=null)?dependsUponFieldValue:""%>" size="20" MAXLENGTH="500" >
</td>
<%
String minValue=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="minValue"+i%>" value="<%=(minValue!=null)?minValue:""%>" size="10" MAXLENGTH="10">
</td>
<%
String maxValue=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="maxValue"+i%>" value="<%=(maxValue!=null)?maxValue:""%>" size="10" MAXLENGTH="10">
</td>
<%
String fieldOrder=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="reqdFieldOrder"+i%>" value="<%=(fieldOrder!=null)?fieldOrder:""%>" size="10" MAXLENGTH="3">
</td>
<%
String sqlQuery=(String)iterFieldValues.next();
%>
<td>
<input type="text" name="<%="sqlQuery"+i%>" value="<%=(sqlQuery!=null)?sqlQuery:""%>" size="10" MAXLENGTH="1000" disabled>
</td>
</tr>
<%}%>
<tr>
</tr>
</table>
<input type="hidden" name="changeType" value="abc">
<input name="addRow" type="button" value=" + " onclick="this.form.changeType.value='addRow';document.FileUploadFormatAdd.submit()"></input>
<input name="deleteRow" type="button" value=" - " onclick="this.form.changeType.value='deleteRow';document.FileUploadFormatAdd.submit()"></input>
Iterator iterFieldValues=listOfFields.iterator();
for (int i=0;i<noOfRows;i++){
String fieldName=(String)iterFieldValues.next();
String minLength=(String)iterFieldValues.next();
String maxLength=(String)iterFieldValues.next();
String fieldType=(String)iterFieldValues.next();
...
}