How pass a form parameter value to a same jsp file?
kaiwing18_at_hotmail.com
Date: 01/23/04
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Date: 22 Jan 2004 20:51:01 -0800
Hi,
I have a following jsp file called "showAsset.jsp" :
<form action="showAsset.jsp" method="post">
<tr BGCOLOR=YELLOW>
<td><input name="sort" type="submit" value="Asset_Number" > </td>
<td><input name="sort" type="submit" value="Description"></td>
<td><input name="sort" type="submit" value="Quantity"></td>
<td><input name="sort" type="submit" value="Sub System"></td>
<td><input name="sort" type="submit" value="Model"></td>
</tr>
</form>
<% String sort1=request.getParameter("sort");
String i=" ";
if (sort1.equals("Asset_Number"))
i="Asset_Number";
else if(sort1.equals("Description"))
i="Description";
else
i="Type";
%>
<%=i%>
But when i put it in Tomcat5.0 server, It give me the following error
message:
-------------------------------------------------------------------------------
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented
it from fulfilling this request.
exception
org.apache.jasper.JasperException
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:358)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
root cause
java.lang.NullPointerException
org.apache.jsp.testdb.showAsset1_jsp._jspService(showAsset1_jsp.java:61)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:133)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:311)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:301)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:248)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
-------------------------------------------------------------------------------
My question is that how can i pass a form value to a same jsp file?
Thank you
Ricky
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