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我写的jsp为什么有句话老编译不过去？
代码如下：
<% exception.printStackTrace(new PrintWriter(out)); %>
这句话老编译不过，为什么，怎么改啊！！！！！！（但是去掉后就可以编译通过）出现的错误如下：
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /JdbcConnectError.jsp at line 39
36: </td></tr>
37: <tr><td>
38: <pre>
39: <% exception.printStackTrace(new PrintWriter(out)); %>
40: </pre>
41: </td></tr>
42: </table>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException
org.apache.jsp.JdbcConnectError_jsp._jspService(JdbcConnectError_jsp.java:97)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.
--------------------------------------------------------------------------------
代码如下：
<%@page import="java.io.*" %>
<%@page isErrorPage="true" %>
<html>
<head>
<title>
Jdbc connect error
</title>
<body>
<h3>
jdbc connect error
</h3>
<table width="600">
<tr><td>
There are several reasons a jdbc connection can fail:
</td></tr>
<tr><td>
<ul>
<li>the sql database is not installed</li>
<li>the sql database is not running</li>
<li>the jdbc driver is not installed</li>
</ul>
</td></tr>
<tr><td>
unfortunagely the above explanations
are probably more lucid
<br>than the usually
cryptic exception message.
</td></tr>
<tr><td>
jdbcSetupTest.jsp threw this exception report:<br>
<%= exception %>
</td></tr>
<tr><td>
stack trace
</td></tr>
<tr><td>
<pre>
<% exception.printStackTrace(new PrintWriter(out)); %>
</pre>
</td></tr>
</table>
</body>
</head>
</html>
<% exception.printStackTrace(new PrintWriter(out)); %>
这句话老编译不过，为什么，怎么改啊！！！！！！（但是去掉后就可以编译通过）出现的错误如下：
exception
org.apache.jasper.JasperException: An exception occurred processing JSP page /JdbcConnectError.jsp at line 39
36: </td></tr>
37: <tr><td>
38: <pre>
39: <% exception.printStackTrace(new PrintWriter(out)); %>
40: </pre>
41: </td></tr>
42: </table>
Stacktrace:
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:524)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:435)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
root cause
java.lang.NullPointerException
org.apache.jsp.JdbcConnectError_jsp._jspService(JdbcConnectError_jsp.java:97)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.14 logs.
--------------------------------------------------------------------------------
...全文
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宋玮-深圳 2007-12-16
- 打赏
- 举报
java.lang.NullPointerException
<%= exception %>这个是不是空
<%= exception %>这个是不是空
