Hiya Ken,
Not to be a jerk or anything, your "newbie help" questions are fine and all,
but the problem is that the only connection they have to Tomcat is that
you're using the container.
It's like if I emailed the GCC or Visual Studio lists saying, "how come I'm
getting all of these memory leaks in my programs?" See what I'm saying?
You really should pick up a book on JSPs / Servlets...
- r
> -----Original Message-----
> From: Kenneth Litwak [mailto:[EMAIL PROTECTED]]
> Sent: Wednesday, August 15, 2001 6:35 PM
> To: [EMAIL PROTECTED]
> Subject: Newbie help needed: error running JSP
>
>
> I just ran my first JSP that uses a form and got an
> error. Unfortunately, the stack trace doesn't tell me
> where in the JSP the error occured (that I can tell)
> or where in my helper bean the problem ight be. I'd
> heard that JSPs are hard to debug, and now I see why.
> The JSP engine is not very helpful with what's wrong.
> Here's the stack trace, followed by the JSP code.
>
> Location: /examples/jsp/form/Form.jsp
>
> Internal Servlet Error:
>
> org.apache.jasper.JasperException: Attempted a bean
> operation on a null object.
> at
> org.apache.jasper.runtime.JspRuntimeLibrary.handleGetProperty(JspR
> untimeLibrary.java:424)
> at
> jsp.f_00025rm._0002fjsp_0002fform_0002fForm_0002ejspForm_jsp_0._js
> pService(_0002fjsp_0002fform_0002fForm_0002ejspForm_jsp_0.java:122)
> at
> org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:119)
> at
> javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.jasper.servlet.JspServlet$JspServletWrapper.service(Jsp
> Servlet.java:177)
> at
> org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:318)
> at
> org.apache.jasper.servlet.JspServlet.service(JspServlet.java:391)
> at
> javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
> at
> org.apache.tomcat.core.ServletWrapper.doService(ServletWrapper.java:404)
> at
> org.apache.tomcat.core.Handler.service(Handler.java:286)
> at
> org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
> at
> org.apache.tomcat.core.ContextManager.internalService(ContextManag
> er.java:797)
> at
> org.apache.tomcat.core.ContextManager.service(ContextManager.java:743)
> at
> org.apache.tomcat.service.http.HttpConnectionHandler.processConnec
> tion(HttpConnectionHandler.java:210)
> at
> org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
> at
> org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:498)
> at java.lang.Thread.run(Thread.java:484)
>
> JSP code:
> <html>
> <body bgcolor="#c8d8f8">
> <form action="/examples/jsp/form/Form.jsp"
> method=post>
> <center>
> <table cellpadding=4 cellspacing=2 border=0>
>
> <th bgcolor="#CCCCFF" colspan=2>
> <font size=5>User Registration</font>
> </th>
>
> <tr>
> <td valign=top>
> <b>First Name</b>
> <br>
> <input type="text" name="firstName" size=15></td>
> <td valign=top>
> <b>Last Name</b>
> <br>
> <input type="text" name="lastName" size=15></td>
> </tr>
>
> <tr>
> <td valign=top colspan=2>
> <b>E-Mail</b>
> <br>
> <input type="text" name="email" size=20>
> <br></td>
> </tr>
>
> <tr>
> <td valign=top colspan=2>
> <b>What languages do you program in?</b>
> <br>
> <input type="checkbox" name="languages"
> value="Java">Java
> <input type="checkbox" name="languages"
> value="C++">C++
> <input type="checkbox" name="languages"
> value="C">C<br>
> <input type="checkbox" name="languages"
> value="Perl">Perl
> <input type="checkbox" name="languages"
> value="COBOL">COBOL
> <input type="checkbox" name="languages"
> value="VB">VB<br>
> </td>
> </tr>
>
> <tr>
> <td valign=top colspan=2>
> <b>How often can we notify you regarding your
> interests?</b>
> <br>
> <input type="radio" name="notify" value="Weekly"
> checked>Weekly
> <input type="radio" name="notify"
> value="Monthly">Monthly
> <input type="radio" name="notify"
> value="Quarterly">Quarterly
> <br></td>
> </tr>
>
> <tr>
> <td align=center colspan=2>
> <input type="submit" value="Submit"> <input
> type="reset" value="Reset">
> </td>
> </tr>
>
> </table>
> </center>
> </form>
> <%-- Create the bean only when the form is posted --%>
> <%
> if (request.getMethod().equals("POST"))
> {
> %>
> <jsp:useBean id="formHandler"
> class="com.shopping.FormBean">
> <%-- provide a setProperty tag and ensure that the
> setter methods are invoked via introspection
> --%>
> <jsp:setProperty name="formHandler" property="*"/>
> </jsp:useBean>
> <p>
> <hr>
> <font color=red>
> <b>You submitted:<P>
> First Name:</b><br>
> <%-- invoke the getter method to display the firstName
> using the getProperty tag --%>
> <jsp:getProperty name="formHandler"
> property="firstName"/><br>
> <br><b>Last Name:</b><br>
> <%-- invoke the getter method to display the lastName
> using the getProperty tag --%>
> <jsp:getProperty name="formhandler"
> property="lastName"/><br>
> <br><b>Email:</b><br>
> <%-- invoke the getter method to display the email
> address using the getProperty tag
> <jsp:getProperty name="formHandler"
> property="email"/><br>
> --%>
> <b>Languages:</b><br>
> <%
> String[] lang = formHandler.getLanguages();
> if (!lang[0].equals("1"))
> {
> out.println("<ul>");
> for (int i=0; i<lang.length; i++)
> out.println("<li>"+lang[i]);
> out.println("</ul>");
> }
> else out.println("Nothing was selected<br>");
> %>
> <b>Notification:</b><br>
> <%-- invoke the getter method to display the
> notification status using the getProperty tag
> --%>
> <jsp:getProperty name="formHandler"
> property="notify"/><br>
> <br>
> <%
> }
> %>
> </font>
> </body>
> </html>
>
> I think this would be better as an attachment but lots
> of mailing lists don't like those, so ugly or not,
> there it is. Thanks.
>
> Ken
>
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