Good morning all. I am a stodgy old VB, COM, ASP, C++ programmer and am
trying to convert to a hip, young Java type. I am pushing through the first
chapters of "Professional Java Server Programming" published by Wrox. I
tried using Apache Server and the Sun SDK directly but found better luck
using Netscape's Fastrack server to test some of these Servlet examples. I
believe I finally have the server configured right and am trying to use
persistent storage in a servlet context that is launched on server startup.
The application is a sample chat room program. However when this code is
executed later:
RoomList roomList = (RoomList) getServletContext().getAttribute("roomList");
The web page gives this:
Server Error
This server has encountered an internal error which prevents it from
fulfilling your request. The most likely cause is a misconfiguration. Please
ask the administrator to look for messages in the server's error log.
And the server's error log shows this:
[27/Oct/2000:07:26:17] failure ( 1524): Internal error: exception thrown
from the servlet service function (uri=/ListRooms):
java.lang.ClassCastException, Stack: java.lang.ClassCastException
at
com.wrox.context.chat.ListRoomsServlet.writePage(ListRoomsServlet.java,
Compiled Code)
at
com.wrox.context.chat.ListRoomsServlet.doGet(ListRoomsServlet.java:32)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:701)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:826)
at
com.netscape.server.http.servlet.NSServletRunner.Service(NSServletRunner.jav
a:502)
I put this code before it to determine the class because I assumed (as a C++
guy) that there is some sort of casting error:
Object ob = getServletContext().getAttribute("roomList");
if(ob==null)
{
out.println("Not set!");
}
else
{
out.println(ob.getClass().toString());
}
which results in:
class com.wrox.context.chat.RoomList
which is the type defined. Anyone have any ideas to keep me from chucking
my Java books out the 9th story window potentially hurting potential
customers ???
BTW, I assumed this wasn't covered in a SUN FAQ, so I hope this isn't too
junior a question.
Regards,
Karl D. Parker
Core Technologies
RetailDNA, LLC
<<http://www.walkerdigital.com/Companies/companies.cfm?screen_id=4.3>> - A
Walker Digital Company
One Stamford Plaza
Stamford, CT 06902
203-564-1458 | 203-564-1772 (fax) | 330-8051272 (cell)
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Some relevant FAQs on JSP/Servlets can be found at:
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http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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